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| author | Catalin Marinas <catalin.marinas@arm.com> | 2026-02-27 15:51:42 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-03-04 14:31:27 +0000 |
| commit | 212dd8477653fe72c2a6a99143cd662f6430cf4f (patch) | |
| tree | e8f5b5e40a78f8c38a369772865f32a8be73ff51 /arch/arm64 | |
| parent | df6e4ab654dc482c1d45776257a62ac10e14086c (diff) | |
| download | linux-next-212dd8477653fe72c2a6a99143cd662f6430cf4f.tar.gz linux-next-212dd8477653fe72c2a6a99143cd662f6430cf4f.zip | |
arm64: Silence sparse warnings caused by the type casting in (cmp)xchg
The arm64 xchg/cmpxchg() wrappers cast the arguments to (unsigned long)
prior to invoking the static inline functions implementing the
operation. Some restrictive type annotations (e.g. __bitwise) lead to
sparse warnings like below:
sparse warnings: (new ones prefixed by >>)
fs/crypto/bio.c:67:17: sparse: sparse: cast from restricted blk_status_t
>> fs/crypto/bio.c:67:17: sparse: sparse: cast to restricted blk_status_t
Force the casting in the arm64 xchg/cmpxchg() wrappers to silence
sparse.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202602230947.uNRsPyBn-lkp@intel.com/
Link: https://lore.kernel.org/r/202602230947.uNRsPyBn-lkp@intel.com/
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/cmpxchg.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h index d7a540736741..6cf3cd6873f5 100644 --- a/arch/arm64/include/asm/cmpxchg.h +++ b/arch/arm64/include/asm/cmpxchg.h @@ -91,8 +91,9 @@ __XCHG_GEN(_mb) #define __xchg_wrapper(sfx, ptr, x) \ ({ \ __typeof__(*(ptr)) __ret; \ - __ret = (__typeof__(*(ptr))) \ - __arch_xchg##sfx((unsigned long)(x), (ptr), sizeof(*(ptr))); \ + __ret = (__force __typeof__(*(ptr))) \ + __arch_xchg##sfx((__force unsigned long)(x), (ptr), \ + sizeof(*(ptr))); \ __ret; \ }) @@ -175,9 +176,10 @@ __CMPXCHG_GEN(_mb) #define __cmpxchg_wrapper(sfx, ptr, o, n) \ ({ \ __typeof__(*(ptr)) __ret; \ - __ret = (__typeof__(*(ptr))) \ - __cmpxchg##sfx((ptr), (unsigned long)(o), \ - (unsigned long)(n), sizeof(*(ptr))); \ + __ret = (__force __typeof__(*(ptr))) \ + __cmpxchg##sfx((ptr), (__force unsigned long)(o), \ + (__force unsigned long)(n), \ + sizeof(*(ptr))); \ __ret; \ }) |