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ARC: arch_cmpxchg_relaxed to use size of pointed type not pointer

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Bradley spotted this snafu when working on two-byte cmpxchg emulation.
He originally folded this fix into his series but the fix itself
uncovered a pre-existing issue, missing arch_atomic64_cmpxchg_relaxed
which just needed to be wired up.

Fixes: e188f3330a ("ARC: cmpxchg/xchg: rewrite as macros to make type safe")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202609240539.AkulvjVe-lkp@intel.com/
Suggested-by: Bradley Morgan <brads@mainlining.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta 2026-09-23 15:01:38 -07:00
parent d12c6a6f0c
commit f050c3e61d
2 changed files with 8 additions and 2 deletions
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6
arch/arc/include/asm/atomic64-arcv2.h
View File

@ -156,6 +156,12 @@ static inline u64 __arch_cmpxchg64_relaxed(volatile void *ptr, u64 old, u64 new)
}
#define arch_cmpxchg64_relaxed __arch_cmpxchg64_relaxed
static inline s64 arch_atomic64_cmpxchg_relaxed(atomic64_t *v, s64 old, s64 new)
{
return arch_cmpxchg64_relaxed(&v->counter, old, new);
}
#define arch_atomic64_cmpxchg_relaxed arch_atomic64_cmpxchg_relaxed
static inline s64 arch_atomic64_xchg(atomic64_t *ptr, s64 new)
{
s64 prev;

4
arch/arc/include/asm/cmpxchg.h
View File

@ -46,7 +46,7 @@
__typeof__(*(ptr)) _n_ = (new); \
__typeof__(*(ptr)) _prev_; \
\
switch(sizeof((_p_))) { \
switch (sizeof(*(_p_))) { \
case 1: \
_prev_ = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *__force)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
break; \
@ -102,7 +102,7 @@
__typeof__(ptr) _p_ = (ptr); \
__typeof__(*(ptr)) _val_ = (val); \
\
switch(sizeof(*(_p_))) { \
switch (sizeof(*(_p_))) { \
case 4: \
_val_ = __arch_xchg(_p_, _val_); \
break; \