Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Al Viro <> | Subject | [PATCH 4/8] sparc32: add __cmpxchg_u{8,16}() and teach __cmpxchg() to handle those sizes | Date | Tue, 2 Apr 2024 00:28:31 -0400 |
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trivial now
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- arch/sparc/include/asm/cmpxchg_32.h | 7 ++++++- arch/sparc/lib/atomic32.c | 4 ++++ 2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/sparc/include/asm/cmpxchg_32.h b/arch/sparc/include/asm/cmpxchg_32.h index 86254c366477..1324984de36a 100644 --- a/arch/sparc/include/asm/cmpxchg_32.h +++ b/arch/sparc/include/asm/cmpxchg_32.h @@ -38,7 +38,8 @@ static __always_inline unsigned long __arch_xchg(unsigned long x, __volatile__ v /* bug catcher for when unsupported size is used - won't link */ void __cmpxchg_called_with_bad_pointer(void); -/* we only need to support cmpxchg of a u32 on sparc */ +u8 __cmpxchg_u8(volatile u8 *m, u8 old, u8 new_); +u16 __cmpxchg_u16(volatile u16 *m, u16 old, u16 new_); u32 __cmpxchg_u32(volatile u32 *m, u32 old, u32 new_); /* don't worry...optimizer will get rid of most of this */ @@ -46,6 +47,10 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) { switch (size) { + case 1: + return __cmpxchg_u8((u8 *)ptr, (u8)old, (u8)new_); + case 2: + return __cmpxchg_u16((u16 *)ptr, (u16)old, (u16)new_); case 4: return __cmpxchg_u32((u32 *)ptr, (u32)old, (u32)new_); default: diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c index 0d215a772428..8ae880ebf07a 100644 --- a/arch/sparc/lib/atomic32.c +++ b/arch/sparc/lib/atomic32.c @@ -173,8 +173,12 @@ EXPORT_SYMBOL(sp32___change_bit); return prev; \ } +CMPXCHG(u8) +CMPXCHG(u16) CMPXCHG(u32) CMPXCHG(u64) +EXPORT_SYMBOL(__cmpxchg_u8); +EXPORT_SYMBOL(__cmpxchg_u16); EXPORT_SYMBOL(__cmpxchg_u32); EXPORT_SYMBOL(__cmpxchg_u64); -- 2.39.2
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