sparc32: add __cmpxchg_u{8,16}() and teach __cmpxchg() to handle those sizes

trivial now

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/arch/sparc/include/asm/cmpxchg_32.h b/arch/sparc/include/asm/cmpxchg_32.h
index 05d5f86a56dc2358dfa0ca22fbfd8e83fa3d345c..8c1a3ca34eeb7aeb0d8cba1bf5de0c3c44d86673 100644 (file)
--- a/arch/sparc/include/asm/cmpxchg_32.h
+++ b/arch/sparc/include/asm/cmpxchg_32.h
@@ -38,21 +38,19 @@ 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 */
 static inline unsigned long
 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
 {
-       switch (size) {
-       case 4:
-               return __cmpxchg_u32(ptr, old, new_);
-       default:
-               __cmpxchg_called_with_bad_pointer();
-               break;
-       }
-       return old;
+       return
+               size == 1 ? __cmpxchg_u8(ptr, old, new_) :
+               size == 2 ? __cmpxchg_u16(ptr, old, new_) :
+               size == 4 ? __cmpxchg_u32(ptr, old, new_) :
+                       (__cmpxchg_called_with_bad_pointer(), old);
 }
 
 #define arch_cmpxchg(ptr, o, n)                                                \

diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c
index 0d215a772428ebb94edc6bcef045242889298202..8ae880ebf07aac2e6748c86858e3eb7003058948 100644 (file)
--- 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);