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Lots of W{,void-}pointer-to-int-cast from ToT clang #887
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Well they at least agreed to remove the
I'll get cracking on these soon. |
Why would you cast a void* to an enum? Is there a commonly used macro that's doing this? |
No. It looks like most of these warnings are from drivers sticking certain values into a https://elixir.bootlin.com/linux/v5.5.4/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.4/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.4/source/include/linux/mod_devicetable.h#L264 |
@nathanchance did you manage to look at the warnings? We have started hitting them with our ToT LLVM builds as well in Chrome OS. |
I think the general consensus is that the kernel is not going to change these sites to work around the warning and LLVM does not want to match GCC exactly so we need a separate diagnostic like I want to try and tackle this myself as it would be my first major contribution to clang but unfortunately, I am a little time starved right now. If someone else wants to implement that ahead of me, please feel free. |
Alright, that wasn't too hard: ClangBuiltLinux/llvm-project@4fd4438 I'll throw it up on Phabricator tomorrow, let me know if there are any general comments towards the approach or nitpicks on the patch itself. cc @davidbolvansky since you seem active in the Sema space (and you commented on the original patch). |
LLVM patch submitted: https://reviews.llvm.org/D75758 Tested with the following diff for the kernel: https://gist.github.com/767cccf4d093c1342e1994083518815e |
Thanks, I was planning to work on it as first thing this morning but @nathanchance beat me to it :). Congrats on your first major LLVM contribution! |
GCC does not warn on casts from pointers to enumerators, while clang currently does: https://godbolt.org/z/3DFDVG This causes a bunch of extra warnings in the Linux kernel, where certain structs contain a void pointer to avoid using a gigantic union for all of the various types of driver data, such as versions. Add a diagnostic that allows certain projects like the kernel to disable the warning just for enums, which allows those projects to keep full compatibility with GCC but keeps the intention of treating casts to integers and enumerators the same by default so that other projects have the opportunity to catch issues not noticed before (or follow suite and disable the warning). Link: ClangBuiltLinux/linux#887
GCC does not warn on casts from pointers to enumerators, while clang currently does: https://godbolt.org/z/3DFDVG This causes a bunch of extra warnings in the Linux kernel, where certain structs contain a void pointer to avoid using a gigantic union for all of the various types of driver data, such as versions. Add a diagnostic that allows certain projects like the kernel to disable the warning just for enums, which allows those projects to keep full compatibility with GCC but keeps the intention of treating casts to integers and enumerators the same by default so that other projects have the opportunity to catch issues not noticed before (or follow suite and disable the warning). Link: ClangBuiltLinux/linux#887 Reviewed By: rjmccall Differential Revision: https://reviews.llvm.org/D75758
LLVM part done: llvm/llvm-project@2a41b31 Kernel part submitted: https://lore.kernel.org/lkml/20200308073400.23398-1-natechancellor@gmail.com/ |
@nathanchance Do you know if the patch has been committed to stable branches? |
@m-gupta Masahiro just picked up the patch today. Not sure if he plans to send a pull request for -rc6 but if not, certainly for -rc7/final; in other words, the patch should be to mainline within a week hopefully. Once it has made it to mainline, it should be shipped to stable within a couple of weeks (depending o If that timeline doesn't work for CrOS, here is the backported version that I will send when I get the rejected email from Greg so there should be no conflicts when stable gets merged. It applies cleanly via |
Thanks, I was just looking for a local patch to apply to our builds. Will replace by an official commit once available. |
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Albert I <kras@raphielgang.org>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Credit: @nathanchance Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: John Vincent <git@tenseventyseven.cf>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: John Vincent <git@tenseventyseven.cf>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: John Vincent <git@tenseventyseven.cf>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Carlos Ayrton Lopez Arroyo <15030201@itcelaya.edu.mx> Signed-off-by: Samuel Pascua <sgpascua@ngcp.ph>
commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: ClangBuiltLinux/linux#887 Link: llvm/llvm-project@2a41b31 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
There are a lot of new instances of the warning in the kernel, which appears to be due to a semantic difference between GCC and clang. I've commented on the Phabricator post about this to see what they say, I'd like not to send a bunch of patches like I did with
-Wmisleading-indentation
.https://reviews.llvm.org/D72231#1878528
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