[pull] master from torvalds:master#91
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Commit d8cbe8b ("tools/testing/selftests/vm: fix build error") tried to include a ARCH check for powerpc, however ARCH is not defined in the Makefile before including lib.mk. This makes test building to skip on both x86 and powerpc. Fix the arch check by replacing it using machine type as it is already defined and used in the test. Link: https://lkml.kernel.org/r/20201215100402.257376-1-harish@linux.ibm.com Fixes: d8cbe8b ("tools/testing/selftests/vm: fix build error") Signed-off-by: Harish <harish@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Sandipan Das <sandipan@linux.ibm.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
syzbot reported the deadlock here [1]. The issue is in hugetlb cow error handling when there are not enough huge pages for the faulting task which took the original reservation. It is possible that other (child) tasks could have consumed pages associated with the reservation. In this case, we want the task which took the original reservation to succeed. So, we unmap any associated pages in children so that they can be used by the faulting task that owns the reservation. The unmapping code needs to hold i_mmap_rwsem in write mode. However, due to commit c0d0381 ("hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization") we are already holding i_mmap_rwsem in read mode when hugetlb_cow is called. Technically, i_mmap_rwsem does not need to be held in read mode for COW mappings as they can not share pmd's. Modifying the fault code to not take i_mmap_rwsem in read mode for COW (and other non-sharable) mappings is too involved for a stable fix. Instead, we simply drop the hugetlb_fault_mutex and i_mmap_rwsem before unmapping. This is OK as it is technically not needed. They are reacquired after unmapping as expected by calling code. Since this is done in an uncommon error path, the overhead of dropping and reacquiring mutexes is acceptable. While making changes, remove redundant BUG_ON after unmap_ref_private. [1] https://lkml.kernel.org/r/000000000000b73ccc05b5cf8558@google.com Link: https://lkml.kernel.org/r/4c5781b8-3b00-761e-c0c7-c5edebb6ec1a@oracle.com Fixes: c0d0381 ("hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization") Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Reported-by: syzbot+5eee4145df3c15e96625@syzkaller.appspotmail.com Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This reverts commit 14dc398. Macro Elver had sent a fix proper fix earlier, and also pointed out corner cases: "I guess what you propose is simpler, but might still have corner cases where we still get warnings. In particular, if some file (for whatever reason) does not include build_bug.h and uses a raw _Static_assert(), then we still get warnings. E.g. I see 1 user of raw _Static_assert() (drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h )." I believe the raw use of _Static_assert() should be allowed, so this should be fixed in genksyms. Even after commit 14dc398 ("kbuild: avoid static_assert for genksyms"), I confirmed the following test code emits the warning. ---------------->8---------------- #include <linux/export.h> _Static_assert((1 ?: 0), ""); void foo(void) { } EXPORT_SYMBOL(foo); ---------------->8---------------- WARNING: modpost: EXPORT symbol "foo" [vmlinux] version generation failed, symbol will not be versioned. Now that commit 869b91992bce ("genksyms: Ignore module scoped _Static_assert()") fixed this issue properly, the workaround should be reverted. Link: https://lkml.org/lkml/2020/12/10/845 Link: https://lkml.kernel.org/r/20201219183911.181442-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Prefer strscpy over the deprecated strlcpy function. Link: https://lkml.kernel.org/r/19fe91084890e2c16fe56f960de6c570a93fa99b.camel@perches.com Signed-off-by: Joe Perches <joe@perches.com> Requested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Otherwise it causes a gcc warning: mm/filemap.c:830:14: warning: no previous prototype for `__add_to_page_cache_locked' [-Wmissing-prototypes] A previous attempt to make this function static led to compilation errors when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked() is referred to by BPF code. Adding a prototype will silence the warning. Link: https://lkml.kernel.org/r/1608693702-4665-1-git-send-email-jrdr.linux@gmail.com Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com> Cc: Alex Shi <alex.shi@linux.alibaba.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
VMware observed a performance regression during memmap init on their platform, and bisected to commit 73a6e47 ("mm: memmap_init: iterate over memblock regions rather that check each PFN") causing it. Before the commit: [0.033176] Normal zone: 1445888 pages used for memmap [0.033176] Normal zone: 89391104 pages, LIFO batch:63 [0.035851] ACPI: PM-Timer IO Port: 0x448 With commit [0.026874] Normal zone: 1445888 pages used for memmap [0.026875] Normal zone: 89391104 pages, LIFO batch:63 [2.028450] ACPI: PM-Timer IO Port: 0x448 The root cause is the current memmap defer init doesn't work as expected. Before, memmap_init_zone() was used to do memmap init of one whole zone, to initialize all low zones of one numa node, but defer memmap init of the last zone in that numa node. However, since commit 73a6e47, function memmap_init() is adapted to iterater over memblock regions inside one zone, then call memmap_init_zone() to do memmap init for each region. E.g, on VMware's system, the memory layout is as below, there are two memory regions in node 2. The current code will mistakenly initialize the whole 1st region [mem 0xab00000000-0xfcffffffff], then do memmap defer to iniatialize only one memmory section on the 2nd region [mem 0x10000000000-0x1033fffffff]. In fact, we only expect to see that there's only one memory section's memmap initialized. That's why more time is costed at the time. [ 0.008842] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff] [ 0.008842] ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff] [ 0.008843] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x55ffffffff] [ 0.008844] ACPI: SRAT: Node 1 PXM 1 [mem 0x5600000000-0xaaffffffff] [ 0.008844] ACPI: SRAT: Node 2 PXM 2 [mem 0xab00000000-0xfcffffffff] [ 0.008845] ACPI: SRAT: Node 2 PXM 2 [mem 0x10000000000-0x1033fffffff] Now, let's add a parameter 'zone_end_pfn' to memmap_init_zone() to pass down the real zone end pfn so that defer_init() can use it to judge whether defer need be taken in zone wide. Link: https://lkml.kernel.org/r/20201223080811.16211-1-bhe@redhat.com Link: https://lkml.kernel.org/r/20201223080811.16211-2-bhe@redhat.com Fixes: commit 73a6e47 ("mm: memmap_init: iterate over memblock regions rather that check each PFN") Signed-off-by: Baoquan He <bhe@redhat.com> Reported-by: Rahul Gopakumar <gopakumarr@vmware.com> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Cc: David Hildenbrand <david@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When `next < old_addr`, `next - old_addr` arithmetic underflows causing `extent` to be incorrect. Make `extent` the smaller of `next - old_addr` or `old_end - old_addr`. Link: https://lkml.kernel.org/r/20201219170433.2418867-1-kaleshsingh@google.com Fixes: c49dd34 ("mm: speedup mremap on 1GB or larger regions") Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Reported-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Helge Deller <deller@gmx.de> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
I'm not sure if I'm completely missing something here, but AFAIKS the reference to the mysterious "COW SMC race" confuses the issue. The original changelog and mailing list thread didn't help me either. This SMC race is where the problem was detected, but isn't the general problem bigger and more obvious: that the new PTE could be picked up at any time by any TLB while entries for the old PTE exist in other TLBs before the TLB flush takes effect? The case where the iTLB and dTLB of a CPU are pointing at different pages is an interesting one but follows from the general problem. The other (minor) thing with the comment I think it makes it a bit clearer to say what the old code was doing (i.e., it avoids the race as opposed to what?). References: 4ce072f ("mm: fix a race condition under SMC + COW") Link: https://lkml.kernel.org/r/20201215121119.351650-1-npiggin@gmail.com Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Hugh Dickins <hughd@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Suresh Siddha <sbsiddha@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Syzbot reported the following [1]: BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 2d993067 P4D 2d993067 PUD 19a3c067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3852 Comm: kworker/1:2 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events free_ipc RIP: 0010:kasan_record_aux_stack+0x77/0xb0 Add null checking slab object from kasan_get_alloc_meta() in order to avoid null pointer dereference. [1] https://syzkaller.appspot.com/x/log.txt?x=10a82a50d00000 Link: https://lkml.kernel.org/r/20201228080018.23041-1-walter-zh.wu@mediatek.com Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com> Suggested-by: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Alexander Potapenko <glider@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Make <asm-generic/local64.h> mandatory in include/asm-generic/Kbuild and remove all arch/*/include/asm/local64.h arch-specific files since they only #include <asm-generic/local64.h>. This fixes build errors on arch/c6x/ and arch/nios2/ for block/blk-iocost.c. Build-tested on 21 of 25 arch-es. (tools problems on the others) Yes, we could even rename <asm-generic/local64.h> to <linux/local64.h> and change all #includes to use <linux/local64.h> instead. Link: https://lkml.kernel.org/r/20201227024446.17018-1-rdunlap@infradead.org Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Suggested-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Masahiro Yamada <masahiroy@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <jacquiot.aurelien@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add these macros, since we can use them in drivers. Link: https://lkml.kernel.org/r/20201229072819.11183-1-sjhuang@iluvatar.ai Signed-off-by: Huang Shijie <sjhuang@iluvatar.ai> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Silly GCC doesn't always inline these trivial functions. Fixes the following warning: arch/x86/kernel/sys_ia32.o: warning: objtool: cp_stat64()+0xd8: call to new_encode_dev() with UACCESS enabled Link: https://lkml.kernel.org/r/984353b44a4484d86ba9f73884b7306232e25e30.1608737428.git.jpoimboe@redhat.com Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Reported-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> [build-tested] Cc: Peter Zijlstra <peterz@infradead.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Some graphic card has very big memory on chip, such as 32G bytes.
In the following case, it will cause overflow:
pool = gen_pool_create(PAGE_SHIFT, NUMA_NO_NODE);
ret = gen_pool_add(pool, 0x1000000, SZ_32G, NUMA_NO_NODE);
va = gen_pool_alloc(pool, SZ_4G);
The overflow occurs in gen_pool_alloc_algo_owner():
....
size = nbits << order;
....
The @nbits is "int" type, so it will overflow.
Then the gen_pool_avail() will return the wrong value.
This patch converts some "int" to "unsigned long", and
changes the compare code in while.
Link: https://lkml.kernel.org/r/20201229060657.3389-1-sjhuang@iluvatar.ai
Signed-off-by: Huang Shijie <sjhuang@iluvatar.ai>
Reported-by: Shi Jiasheng <jiasheng.shi@iluvatar.ai>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Decompressing zlib streams on s390 fails with "incorrect data check" error. Userspace zlib checks inflate_state.flags in order to byteswap checksums only for zlib streams, and s390 hardware inflate code, which was ported from there, tries to match this behavior. At the same time, kernel zlib does not use inflate_state.flags, so it contains essentially random values. For many use cases either zlib stream is zeroed out or checksum is not used, so this problem is masked, but at least SquashFS is still affected. Fix by always passing a checksum to and from the hardware as is, which matches zlib_inflate()'s expectations. Link: https://lkml.kernel.org/r/20201215155551.894884-1-iii@linux.ibm.com Fixes: 1261961 ("lib/zlib: add s390 hardware support for kernel zlib_inflate") Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Mikhail Zaslonko <zaslonko@linux.ibm.com> Cc: <stable@vger.kernel.org> [5.6+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
In commit 11fb479 ("zlib: export S390 symbols for zlib modules"), I added EXPORT_SYMBOL()s to dfltcc_inflate.c but then Mikhail said that these should probably be in dfltcc_syms.c with the other EXPORT_SYMBOL()s. However, that is contrary to the current kernel style, which places EXPORT_SYMBOL() immediately after the function that it applies to, so move all EXPORT_SYMBOL()s to their respective function locations and drop the dfltcc_syms.c file. Also move MODULE_LICENSE() from the deleted file to dfltcc.c. [rdunlap@infradead.org: remove dfltcc_syms.o from Makefile] Link: https://lkml.kernel.org/r/20201227171837.15492-1-rdunlap@infradead.org Link: https://lkml.kernel.org/r/20201219052530.28461-1-rdunlap@infradead.org Fixes: 11fb479 ("zlib: export S390 symbols for zlib modules") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Zaslonko Mikhail <zaslonko@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
It's convenient to have page->objects initialized before calling into account_slab_page(). In particular, this information can be used to pre-alloc the obj_cgroup vector. Let's call account_slab_page() a bit later, after the initialization of page->objects. This commit doesn't bring any functional change, but is required for further optimizations. [akpm@linux-foundation.org: undo changes needed by forthcoming mm-memcg-slab-pre-allocate-obj_cgroups-for-slab-caches-with-slab_account.patch] Link: https://lkml.kernel.org/r/20201110195753.530157-1-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge misc fixes from Andrew Morton: "16 patches Subsystems affected by this patch series: mm (selftests, hugetlb, pagecache, mremap, kasan, and slub), kbuild, checkpatch, misc, and lib" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm: slub: call account_slab_page() after slab page initialization zlib: move EXPORT_SYMBOL() and MODULE_LICENSE() out of dfltcc_syms.c lib/zlib: fix inflating zlib streams on s390 lib/genalloc: fix the overflow when size is too big kdev_t: always inline major/minor helper functions sizes.h: add SZ_8G/SZ_16G/SZ_32G macros local64.h: make <asm/local64.h> mandatory kasan: fix null pointer dereference in kasan_record_aux_stack mm: generalise COW SMC TLB flushing race comment mm/mremap.c: fix extent calculation mm: memmap defer init doesn't work as expected mm: add prototype for __add_to_page_cache_locked() checkpatch: prefer strscpy to strlcpy Revert "kbuild: avoid static_assert for genksyms" mm/hugetlb: fix deadlock in hugetlb_cow error path selftests/vm: fix building protection keys test
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The recent rework of probe_kernel_address() and its conversion to get_kernel_nofault() inadvertently broke is_prefetch(). Before this change, probe_kernel_address() was used as a sloppy "read user or kernel memory" helper, but it doesn't do that any more. The new get_kernel_nofault() reads *kernel* memory only, which completely broke is_prefetch() for user access. Adjust the code to the correct accessor based on access mode. The manual address bounds check is no longer necessary, since the accessor helpers (get_user() / get_kernel_nofault()) do the right thing all by themselves. As a bonus, by using the correct accessor, the open-coded address bounds check is not needed anymore. [ bp: Massage commit message. ] Fixes: eab0c60 ("maccess: unify the probe kernel arch hooks") Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/b91f7f92f3367d2d3a88eec3b09c6aab1b2dc8ef.1612924255.git.luto@kernel.org
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According to the Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors, only early revisions of family 0xF are affected. This will avoid unnecessarily fetching instruction bytes before sending SIGSEGV to user programs. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/477173b7784bc28afb3e53d76ae5ef143917e8dd.1612924255.git.luto@kernel.org
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…rnel/git/tip/tip
Pull x86 mm cleanups from Borislav Petkov:
- PTRACE_GETREGS/PTRACE_PUTREGS regset selection cleanup
- Another initial cleanup - more to follow - to the fault handling
code.
- Other minor cleanups and corrections.
* tag 'x86_mm_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
x86/{fault,efi}: Fix and rename efi_recover_from_page_fault()
x86/fault: Don't run fixups for SMAP violations
x86/fault: Don't look for extable entries for SMEP violations
x86/fault: Rename no_context() to kernelmode_fixup_or_oops()
x86/fault: Bypass no_context() for implicit kernel faults from usermode
x86/fault: Split the OOPS code out from no_context()
x86/fault: Improve kernel-executing-user-memory handling
x86/fault: Correct a few user vs kernel checks wrt WRUSS
x86/fault: Document the locking in the fault_signal_pending() path
x86/fault/32: Move is_f00f_bug() to do_kern_addr_fault()
x86/fault: Fold mm_fault_error() into do_user_addr_fault()
x86/fault: Skip the AMD erratum #91 workaround on unaffected CPUs
x86/fault: Fix AMD erratum #91 errata fixup for user code
x86/Kconfig: Remove HPET_EMULATE_RTC depends on RTC
x86/asm: Fixup TASK_SIZE_MAX comment
x86/ptrace: Clean up PTRACE_GETREGS/PTRACE_PUTREGS regset selection
x86/vm86/32: Remove VM86_SCREEN_BITMAP support
x86: Remove definition of DEBUG
x86/entry: Remove now unused do_IRQ() declaration
x86/mm: Remove duplicate definition of _PAGE_PAT_LARGE
...
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