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author | Will Deacon <will.deacon@arm.com> | 2017-10-24 11:22:46 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-25 14:26:33 +0100 |
commit | a9772285a7246c2a816da7f50c8c1e94b264770d (patch) | |
tree | f1ee472e666c45acbf97a1fbcf2c68bc1daeecf2 /Documentation/hwmon/emc2103 | |
parent | d605778b613a535d258c1e6a931bc2153aa63185 (diff) | |
download | linux-stable-a9772285a7246c2a816da7f50c8c1e94b264770d.tar.gz linux-stable-a9772285a7246c2a816da7f50c8c1e94b264770d.tar.bz2 linux-stable-a9772285a7246c2a816da7f50c8c1e94b264770d.zip |
linux/compiler.h: Split into compiler.h and compiler_types.h
commit d15155824c5014803d91b829736d249c500bdda6 upstream.
linux/compiler.h is included indirectly by linux/types.h via
uapi/linux/types.h -> uapi/linux/posix_types.h -> linux/stddef.h
-> uapi/linux/stddef.h and is needed to provide a proper definition of
offsetof.
Unfortunately, compiler.h requires a definition of
smp_read_barrier_depends() for defining lockless_dereference() and soon
for defining READ_ONCE(), which means that all
users of READ_ONCE() will need to include asm/barrier.h to avoid splats
such as:
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from arch/h8300/kernel/asm-offsets.c:11:
include/linux/list.h: In function 'list_empty':
>> include/linux/compiler.h:343:2: error: implicit declaration of function 'smp_read_barrier_depends' [-Werror=implicit-function-declaration]
smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \
^
A better alternative is to include asm/barrier.h in linux/compiler.h,
but this requires a type definition for "bool" on some architectures
(e.g. x86), which is defined later by linux/types.h. Type "bool" is also
used directly in linux/compiler.h, so the whole thing is pretty fragile.
This patch splits compiler.h in two: compiler_types.h contains type
annotations, definitions and the compiler-specific parts, whereas
compiler.h #includes compiler-types.h and additionally defines macros
such as {READ,WRITE.ACCESS}_ONCE().
uapi/linux/stddef.h and linux/linkage.h are then moved over to include
linux/compiler_types.h, which fixes the build for h8 and blackfin.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1508840570-22169-2-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/hwmon/emc2103')
0 files changed, 0 insertions, 0 deletions