diff options
| author | David Rientjes <rientjes@google.com> | 2017-07-06 15:35:24 -0700 |
|---|---|---|
| committer | Greg Hackmann <ghackmann@google.com> | 2017-10-09 14:00:13 -0700 |
| commit | 75eb3438b28512e33877354349d01f2dd659f0e6 (patch) | |
| tree | 6973c271a18361ca3a6ff10f4e6c4572f6792ba0 /include/linux/compiler-clang.h | |
| parent | e221e075ddd44d40fc4a51613c667168752e0051 (diff) | |
UPSTREAM: compiler, clang: always inline when CONFIG_OPTIMIZE_INLINING is disabled
The motivation for commit abb2ea7dfd82 ("compiler, clang: suppress
warning for unused static inline functions") was to suppress clang's
warnings about unused static inline functions.
For configs without CONFIG_OPTIMIZE_INLINING enabled, such as any non-x86
architecture, `inline' in the kernel implies that
__attribute__((always_inline)) is used.
Some code depends on that behavior, see
https://lkml.org/lkml/2017/6/13/918:
net/built-in.o: In function `__xchg_mb':
arch/arm64/include/asm/cmpxchg.h:99: undefined reference to `__compiletime_assert_99'
arch/arm64/include/asm/cmpxchg.h:99: undefined reference to `__compiletime_assert_99
The full fix would be to identify these breakages and annotate the
functions with __always_inline instead of `inline'. But since we are
late in the 4.12-rc cycle, simply carry forward the forced inlining
behavior and work toward moving arm64, and other architectures, toward
CONFIG_OPTIMIZE_INLINING behavior.
(cherry picked from commit 9a04dbcfb33b4012d0ce8c0282f1e3ca694675b1)
Change-Id: I13891c2f1e588d8c7febe5d2d57134abb31d6ecd
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1706261552200.1075@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Reported-by: Sodagudi Prasad <psodagud@codeaurora.org>
Tested-by: Sodagudi Prasad <psodagud@codeaurora.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Diffstat (limited to 'include/linux/compiler-clang.h')
| -rw-r--r-- | include/linux/compiler-clang.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h index d614c5ea1b5e..de179993e039 100644 --- a/include/linux/compiler-clang.h +++ b/include/linux/compiler-clang.h @@ -15,11 +15,3 @@ * with any version that can compile the kernel */ #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) - -/* - * GCC does not warn about unused static inline functions for - * -Wunused-function. This turns out to avoid the need for complex #ifdef - * directives. Suppress the warning in clang as well. - */ -#undef inline -#define inline inline __attribute__((unused)) notrace |