diff options
Diffstat (limited to 'arch/sparc/include/asm/spinlock_64.h')
| -rw-r--r-- | arch/sparc/include/asm/spinlock_64.h | 31 |
1 files changed, 6 insertions, 25 deletions
diff --git a/arch/sparc/include/asm/spinlock_64.h b/arch/sparc/include/asm/spinlock_64.h index 120cfe4577c7..c4d274d330e9 100644 --- a/arch/sparc/include/asm/spinlock_64.h +++ b/arch/sparc/include/asm/spinlock_64.h @@ -13,17 +13,12 @@ * and rebuild your kernel. */ -/* All of these locking primitives are expected to work properly - * even in an RMO memory model, which currently is what the kernel - * runs in. - * - * There is another issue. Because we play games to save cycles - * in the non-contention case, we need to be extra careful about - * branch targets into the "spinning" code. They live in their - * own section, but the newer V9 branches have a shorter range - * than the traditional 32-bit sparc branch variants. The rule - * is that the branches that go into and out of the spinner sections - * must be pre-V9 branches. +/* Because we play games to save cycles in the non-contention case, we + * need to be extra careful about branch targets into the "spinning" + * code. They live in their own section, but the newer V9 branches + * have a shorter range than the traditional 32-bit sparc branch + * variants. The rule is that the branches that go into and out of + * the spinner sections must be pre-V9 branches. */ #define __raw_spin_is_locked(lp) ((lp)->lock != 0) @@ -38,12 +33,10 @@ static inline void __raw_spin_lock(raw_spinlock_t *lock) __asm__ __volatile__( "1: ldstub [%1], %0\n" -" membar #StoreLoad | #StoreStore\n" " brnz,pn %0, 2f\n" " nop\n" " .subsection 2\n" "2: ldub [%1], %0\n" -" membar #LoadLoad\n" " brnz,pt %0, 2b\n" " nop\n" " ba,a,pt %%xcc, 1b\n" @@ -59,7 +52,6 @@ static inline int __raw_spin_trylock(raw_spinlock_t *lock) __asm__ __volatile__( " ldstub [%1], %0\n" -" membar #StoreLoad | #StoreStore" : "=r" (result) : "r" (lock) : "memory"); @@ -70,7 +62,6 @@ static inline int __raw_spin_trylock(raw_spinlock_t *lock) static inline void __raw_spin_unlock(raw_spinlock_t *lock) { __asm__ __volatile__( -" membar #StoreStore | #LoadStore\n" " stb %%g0, [%0]" : /* No outputs */ : "r" (lock) @@ -83,14 +74,12 @@ static inline void __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long fla __asm__ __volatile__( "1: ldstub [%2], %0\n" -" membar #StoreLoad | #StoreStore\n" " brnz,pn %0, 2f\n" " nop\n" " .subsection 2\n" "2: rdpr %%pil, %1\n" " wrpr %3, %%pil\n" "3: ldub [%2], %0\n" -" membar #LoadLoad\n" " brnz,pt %0, 3b\n" " nop\n" " ba,pt %%xcc, 1b\n" @@ -113,12 +102,10 @@ static void inline __read_lock(raw_rwlock_t *lock) "4: add %0, 1, %1\n" " cas [%2], %0, %1\n" " cmp %0, %1\n" -" membar #StoreLoad | #StoreStore\n" " bne,pn %%icc, 1b\n" " nop\n" " .subsection 2\n" "2: ldsw [%2], %0\n" -" membar #LoadLoad\n" " brlz,pt %0, 2b\n" " nop\n" " ba,a,pt %%xcc, 4b\n" @@ -139,7 +126,6 @@ static int inline __read_trylock(raw_rwlock_t *lock) " add %0, 1, %1\n" " cas [%2], %0, %1\n" " cmp %0, %1\n" -" membar #StoreLoad | #StoreStore\n" " bne,pn %%icc, 1b\n" " mov 1, %0\n" "2:" @@ -155,7 +141,6 @@ static void inline __read_unlock(raw_rwlock_t *lock) unsigned long tmp1, tmp2; __asm__ __volatile__( -" membar #StoreLoad | #LoadLoad\n" "1: lduw [%2], %0\n" " sub %0, 1, %1\n" " cas [%2], %0, %1\n" @@ -179,12 +164,10 @@ static void inline __write_lock(raw_rwlock_t *lock) "4: or %0, %3, %1\n" " cas [%2], %0, %1\n" " cmp %0, %1\n" -" membar #StoreLoad | #StoreStore\n" " bne,pn %%icc, 1b\n" " nop\n" " .subsection 2\n" "2: lduw [%2], %0\n" -" membar #LoadLoad\n" " brnz,pt %0, 2b\n" " nop\n" " ba,a,pt %%xcc, 4b\n" @@ -197,7 +180,6 @@ static void inline __write_lock(raw_rwlock_t *lock) static void inline __write_unlock(raw_rwlock_t *lock) { __asm__ __volatile__( -" membar #LoadStore | #StoreStore\n" " stw %%g0, [%0]" : /* no outputs */ : "r" (lock) @@ -217,7 +199,6 @@ static int inline __write_trylock(raw_rwlock_t *lock) " or %0, %4, %1\n" " cas [%3], %0, %1\n" " cmp %0, %1\n" -" membar #StoreLoad | #StoreStore\n" " bne,pn %%icc, 1b\n" " nop\n" " mov 1, %2\n" |