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arm64: Silence sparse warnings caused by the type casting in (cmp)xchg

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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>
This commit is contained in:
Catalin Marinas 2026-02-27 15:51:42 +00:00 • committed by Will Deacon
parent df6e4ab654
commit 212dd84776
1 changed files with 7 additions and 5 deletions
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12
arch/arm64/include/asm/cmpxchg.h
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@ -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; \
})