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    Subject[PATCH 4/8] sparc32: add __cmpxchg_u{8,16}() and teach __cmpxchg() to handle those sizes
    Date
    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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