…rms of __IS_POWER_OF_2[_OR_0]()

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…R_OF_2() to <linux/power_of_2.h>

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…) macros

Tested:

$ cat pow2.c
 #include <stdio.h>

 #define is_power_of_2_or_0(n)  (((n) & ((n) - 1)) == 0)
 #define is_power_of_2(n)       (is_power_of_2_or_0(n) && ((n) != 0))

int main(void)
{
	printf("%i, %i, %i\n", 8, is_power_of_2_or_0(8), is_power_of_2(8));
	printf("%i, %i, %i\n", 7, is_power_of_2_or_0(7), is_power_of_2(7));
	printf("%i, %i, %i\n", 6, is_power_of_2_or_0(6), is_power_of_2(6));
	printf("%i, %i, %i\n", 5, is_power_of_2_or_0(5), is_power_of_2(5));
	printf("%i, %i, %i\n", 4, is_power_of_2_or_0(4), is_power_of_2(4));
	printf("%i, %i, %i\n", 3, is_power_of_2_or_0(3), is_power_of_2(3));
	printf("%i, %i, %i\n", 2, is_power_of_2_or_0(2), is_power_of_2(2));
	printf("%i, %i, %i\n", 1, is_power_of_2_or_0(1), is_power_of_2(1));
	printf("%i, %i, %i\n", 0, is_power_of_2_or_0(0), is_power_of_2(0));
}

$ cc pow2.c
$ ./a.out
8, 1, 1
7, 0, 0
6, 0, 0
5, 0, 0
4, 1, 1
3, 0, 0
2, 1, 1
1, 1, 1
0, 1, 0

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…nux/array_size.h>

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…eparate header

Include <linux/same_type.h> from <linux/compiler_types.h> for compatibility.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…_ZERO()

Historically, BUILD_BUG_ON_ZERO() has been hard to read.
__must_be_array() is based on BUILD_BUG_ON_ZERO(),
and unlike BUILD_BUG_ON_*(),
it has a pretty readable name.

Let's generalize it with this kind of usage:

	#define __must_be_array(a)  must_be(__is_array(a))

So next step is to create macros of the kind:
__is_array(a)

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

Place braces in a ({}) expression
similarly to how a function would have them.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

Casts are dangerous.
Moreover, (almost) everything converts to 'void *' implicitly,
with the exception of pointers to const.

Change the temporary to be const,
and therefore allow implicit conversion from everything.
Since we don't modify it,
this also adds safety.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…_of() in terms of memberof()

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

There's no more a need for the temporary variable __mptr,
since now it's only passed to functions that accept a 'const void *',
and everything can convert automatically to it,
reducing the need for the cast too.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

(((T *)0)->m) if a typical construct used by some wrappers,
and also directly in many places.
Write a macro to encapsulate that construct,
and avoid repetition (and possible mistakes).

It also helps readability by reducing the complexity
of mentally parsing so many symbols together,
with a readable name.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…e header

Include <linux/array_size.h> from <linux/kernel.h> for compatibility.

Include <linux/compiler.h> for __must_be_array().

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…to a separate header

Include <linux/typeof_member.h> from <linux/container_of.h> for compatibility.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

Include <linux/NULL.h> from <linux/stddef.h> for compatibility.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…ate header

Include <linux/offsetofend.h> from <linux/stddef.h> for compatibility.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…arate header

Include <linux/sizeof_field.h> from <linux/stddef.h> for compatibility.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

…ader

Include <linux/offsetof.h> from <linux/stddef.h> for compatibility.

From <linux/offsetof.h>:
	Include the same exact deps that <linux/stddef.h> had.
	Changing that in any way broke my compilation.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

f

In the struct supplier_bindings the member 'node_not_dev' is described as
"The consumer node containing the property is never a device.", but that is
inconsistent with the behaviour of the code in of_link_property(), as it
calls of_get_compat_node() that starts parsing for a compatible property
from the node it gets passed to it. The proper behaviour is to start at the
node's parent, so let's do that.

While at it, let's take the opportunity to update the description of the
'node_not_dev' flag, as to clarify its purpose.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210902090221.820254-1-ulf.hansson@linaro.org

Add vendor prefix for T-Head Semiconductor [1] [2]

[1] https://github.com/T-head-Semi
[2] https://www.t-head.cn/

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree <devicetree@vger.kernel.org>
Link: https://lore.kernel.org/r/20211103020921.3870764-1-guoren@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Add Kconfig support for -Wimplicit-fallthrough for both GCC and Clang.

The compiler option is under configuration CC_IMPLICIT_FALLTHROUGH,
which is enabled by default.

Special thanks to Nathan Chancellor who fixed the Clang bug[1][2]. This
bugfix only appears in Clang 14.0.0, so older versions still contain
the bug and -Wimplicit-fallthrough won't be enabled for them, for now.

This concludes a long journey and now we are finally getting rid
of the unintentional fallthrough bug-class in the kernel, entirely. :)

Link: llvm/llvm-project@9ed4a94 [1]
Link: https://bugs.llvm.org/show_bug.cgi?id=51094 [2]
Link: KSPP#115
Link: ClangBuiltLinux#236
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Co-developed-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

…fs-linux

Pull xfs cleanups from Darrick Wong:
 "The most 'exciting' aspect of this branch is that the xfsprogs
  maintainer and I have worked through the last of the code
  discrepancies between kernel and userspace libxfs such that there are
  no code differences between the two except for #includes.

  IOWs, diff suffices to demonstrate that the userspace tools behave the
  same as the kernel, and kernel-only bits are clearly marked in the
  /kernel/ source code instead of just the userspace source.

  Summary:

   - Clean up open-coded swap() calls.

   - A little bit of #ifdef golf to complete the reunification of the
     kernel and userspace libxfs source code"

* tag 'xfs-5.16-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: sync xfs_btree_split macros with userspace libxfs
  xfs: #ifdef out perag code for userspace
  xfs: use swap() to make dabtree code cleaner

…ernel/git/deller/parisc-linux

Pull more parisc fixes from Helge Deller:
 "Fix a build error in stracktrace.c, fix resolving of addresses to
  function names in backtraces, fix single-stepping in assembly code and
  flush userspace pte's when using set_pte_at()"

* tag 'for-5.16/parisc-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc/entry: fix trace test in syscall exit path
  parisc: Flush kernel data mapping in set_pte_at() when installing pte for user page
  parisc: Fix implicit declaration of function '__kernel_text_address'
  parisc: Fix backtrace to always include init funtion names

Pull arch/sh updates from Rich Felker.

* tag 'sh-for-5.16' of git://git.libc.org/linux-sh:
  sh: pgtable-3level: Fix cast to pointer from integer of different size
  sh: fix READ/WRITE redefinition warnings
  sh: define __BIG_ENDIAN for math-emu
  sh: math-emu: drop unused functions
  sh: fix kconfig unmet dependency warning for FRAME_POINTER
  sh: Cleanup about SPARSE_IRQ
  sh: kdump: add some attribute to function
  maple: fix wrong return value of maple_bus_init().
  sh: boot: avoid unneeded rebuilds under arch/sh/boot/compressed/
  sh: boot: add intermediate vmlinux.bin* to targets instead of extra-y
  sh: boards: Fix the cacography in irq.c
  sh: check return code of request_irq
  sh: fix trivial misannotations

Pull ARM fixes from Russell King:

 - Fix early_iounmap

 - Drop cc-option fallbacks for architecture selection

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 9156/1: drop cc-option fallbacks for architecture selection
  ARM: 9155/1: fix early early_iounmap()

…cm/linux/kernel/git/robh/linux

Pull devicetree fixes from Rob Herring:

 - Two fixes due to DT node name changes on Arm, Ltd. boards

 - Treewide rename of Ingenic CGU headers

 - Update ST email addresses

 - Remove Netlogic DT bindings

 - Dropping few more cases of redundant 'maxItems' in schemas

 - Convert toshiba,tc358767 bridge binding to schema

* tag 'devicetree-fixes-for-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  dt-bindings: watchdog: sunxi: fix error in schema
  bindings: media: venus: Drop redundant maxItems for power-domain-names
  dt-bindings: Remove Netlogic bindings
  clk: versatile: clk-icst: Ensure clock names are unique
  of: Support using 'mask' in making device bus id
  dt-bindings: treewide: Update @st.com email address to @FOSS.st.com
  dt-bindings: media: Update maintainers for st,stm32-hwspinlock.yaml
  dt-bindings: media: Update maintainers for st,stm32-cec.yaml
  dt-bindings: mfd: timers: Update maintainers for st,stm32-timers
  dt-bindings: timer: Update maintainers for st,stm32-timer
  dt-bindings: i2c: imx: hardware do not restrict clock-frequency to only 100 and 400 kHz
  dt-bindings: display: bridge: Convert toshiba,tc358767.txt to yaml
  dt-bindings: Rename Ingenic CGU headers to ingenic,*.h

…linux/kernel/git/tip/tip

Pull timer fix from Thomas Gleixner:
 "A single fix for POSIX CPU timers to address a problem where POSIX CPU
  timer delivery stops working for a new child task because
  copy_process() copies state information which is only valid for the
  parent task"

* tag 'timers-urgent-2021-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  posix-cpu-timers: Clear task::posix_cputimers_work in copy_process()

…ux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "A set of fixes for the interrupt subsystem

  Core code:

   - A regression fix for the Open Firmware interrupt mapping code where
     a interrupt controller property in a node caused a map property in
     the same node to be ignored.

  Interrupt chip drivers:

   - Workaround a limitation in SiFive PLIC interrupt chip which
     silently ignores an EOI when the interrupt line is masked.

   - Provide the missing mask/unmask implementation for the CSKY MP
     interrupt controller.

  PCI/MSI:

   - Prevent a use after free when PCI/MSI interrupts are released by
     destroying the sysfs entries before freeing the memory which is
     accessed in the sysfs show() function.

   - Implement a mask quirk for the Nvidia ION AHCI chip which does not
     advertise masking capability despite implementing it. Even worse
     the chip comes out of reset with all MSI entries masked, which due
     to the missing masking capability never get unmasked.

   - Move the check which prevents accessing the MSI[X] masking for XEN
     back into the low level accessors. The recent consolidation missed
     that these accessors can be invoked from places which do not have
     that check which broke XEN. Move them back to he original place
     instead of sprinkling tons of these checks all over the code"

* tag 'irq-urgent-2021-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  of/irq: Don't ignore interrupt-controller when interrupt-map failed
  irqchip/sifive-plic: Fixup EOI failed when masked
  irqchip/csky-mpintc: Fixup mask/unmask implementation
  PCI/MSI: Destroy sysfs before freeing entries
  PCI: Add MSI masking quirk for Nvidia ION AHCI
  PCI/MSI: Deal with devices lying about their MSI mask capability
  PCI/MSI: Move non-mask check back into low level accessors

…/linux/kernel/git/tip/tip

Pull x86 static call update from Thomas Gleixner:
 "A single fix for static calls to make the trampoline patching more
  robust by placing explicit signature bytes after the call trampoline
  to prevent patching random other jumps like the CFI jump table
  entries"

* tag 'locking-urgent-2021-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  static_call,x86: Robustify trampoline patching

…m/linux/kernel/git/tip/tip

Pull scheduler fixes from Borislav Petkov:

 - Avoid touching ~100 config files in order to be able to select the
   preemption model

 - clear cluster CPU masks too, on the CPU unplug path

 - prevent use-after-free in cfs

 - Prevent a race condition when updating CPU cache domains

 - Factor out common shared part of smp_prepare_cpus() into a common
   helper which can be called by both baremetal and Xen, in order to fix
   a booting of Xen PV guests

* tag 'sched_urgent_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  preempt: Restore preemption model selection configs
  arch_topology: Fix missing clear cluster_cpumask in remove_cpu_topology()
  sched/fair: Prevent dead task groups from regaining cfs_rq's
  sched/core: Mitigate race cpus_share_cache()/update_top_cache_domain()
  x86/smp: Factor out parts of native_smp_prepare_cpus()

…/linux/kernel/git/tip/tip

Pull perf fixes from Borislav Petkov:

 - Prevent unintentional page sharing by checking whether a page
   reference to a PMU samples page has been acquired properly before
   that

 - Make sure the LBR_SELECT MSR is saved/restored too

 - Reset the LBR_SELECT MSR when resetting the LBR PMU to clear any
   residual data left

* tag 'perf_urgent_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Avoid put_page() when GUP fails
  perf/x86/vlbr: Add c->flags to vlbr event constraints
  perf/x86/lbr: Reset LBR_SELECT during vlbr reset

…linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - Add the model number of a new, Raptor Lake CPU, to intel-family.h

 - Do not log spurious corrected MCEs on SKL too, due to an erratum

 - Clarify the path of paravirt ops patches upstream

 - Add an optimization to avoid writing out AMX components to sigframes
   when former are in init state

* tag 'x86_urgent_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu: Add Raptor Lake to Intel family
  x86/mce: Add errata workaround for Skylake SKX37
  MAINTAINERS: Add some information to PARAVIRT_OPS entry
  x86/fpu: Optimize out sigframe xfeatures when in init state