diff options
Diffstat (limited to 'arch/sparc64/lib/bitops.S')
| -rw-r--r-- | arch/sparc64/lib/bitops.S | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/arch/sparc64/lib/bitops.S b/arch/sparc64/lib/bitops.S index 886dcd2b376..31afbfe6c1e 100644 --- a/arch/sparc64/lib/bitops.S +++ b/arch/sparc64/lib/bitops.S @@ -7,20 +7,26 @@ #include <linux/config.h> #include <asm/asi.h> + .text + /* On SMP we need to use memory barriers to ensure * correct memory operation ordering, nop these out * for uniprocessor. */ + #ifdef CONFIG_SMP #define BITOP_PRE_BARRIER membar #StoreLoad | #LoadLoad -#define BITOP_POST_BARRIER membar #StoreLoad | #StoreStore +#define BITOP_POST_BARRIER \ + ba,pt %xcc, 80b; \ + membar #StoreLoad | #StoreStore + +80: retl + nop #else -#define BITOP_PRE_BARRIER nop -#define BITOP_POST_BARRIER nop +#define BITOP_PRE_BARRIER +#define BITOP_POST_BARRIER #endif - .text - .globl test_and_set_bit .type test_and_set_bit,#function test_and_set_bit: /* %o0=nr, %o1=addr */ @@ -37,10 +43,11 @@ test_and_set_bit: /* %o0=nr, %o1=addr */ cmp %g7, %g1 bne,pn %xcc, 1b and %g7, %o2, %g2 - BITOP_POST_BARRIER clr %o0 + movrne %g2, 1, %o0 + BITOP_POST_BARRIER retl - movrne %g2, 1, %o0 + nop .size test_and_set_bit, .-test_and_set_bit .globl test_and_clear_bit @@ -59,10 +66,11 @@ test_and_clear_bit: /* %o0=nr, %o1=addr */ cmp %g7, %g1 bne,pn %xcc, 1b and %g7, %o2, %g2 - BITOP_POST_BARRIER clr %o0 + movrne %g2, 1, %o0 + BITOP_POST_BARRIER retl - movrne %g2, 1, %o0 + nop .size test_and_clear_bit, .-test_and_clear_bit .globl test_and_change_bit @@ -81,10 +89,11 @@ test_and_change_bit: /* %o0=nr, %o1=addr */ cmp %g7, %g1 bne,pn %xcc, 1b and %g7, %o2, %g2 - BITOP_POST_BARRIER clr %o0 + movrne %g2, 1, %o0 + BITOP_POST_BARRIER retl - movrne %g2, 1, %o0 + nop .size test_and_change_bit, .-test_and_change_bit .globl set_bit |