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sparc64: Stop using memory barriers for atomics and locks. 

The kernel always executes in the TSO memory model now,
so none of this stuff is necessary any more.

With helpful feedback from Nick Piggin.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-11-15 13:33:25 -08:00
parent 64f2dde3f7
commit 293666b7a1
15 changed files with 17 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/sparc/include/asm/atomic_64.h
View File

@ -112,17 +112,10 @@ static inline int atomic64_add_unless(atomic64_t *v, long a, long u)
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
/* Atomic operations are already serializing */
#ifdef CONFIG_SMP
#define smp_mb__before_atomic_dec() membar_storeload_loadload();
#define smp_mb__after_atomic_dec() membar_storeload_storestore();
#define smp_mb__before_atomic_inc() membar_storeload_loadload();
#define smp_mb__after_atomic_inc() membar_storeload_storestore();
#else
#define smp_mb__before_atomic_dec() barrier()
#define smp_mb__after_atomic_dec() barrier()
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#endif
#include <asm-generic/atomic.h>
#endif /* !(__ARCH_SPARC64_ATOMIC__) */

5
arch/sparc/include/asm/bitops_64.h
View File

@ -23,13 +23,8 @@ extern void change_bit(unsigned long nr, volatile unsigned long *addr);
#include <asm-generic/bitops/non-atomic.h>
#ifdef CONFIG_SMP
#define smp_mb__before_clear_bit() membar_storeload_loadload()
#define smp_mb__after_clear_bit() membar_storeload_storestore()
#else
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
#endif
#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/__ffs.h>

14
arch/sparc/include/asm/spinlock_64.h
View File

@ -33,12 +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"
@ -54,7 +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");
@ -65,7 +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)
@ -78,14 +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"
@ -108,12 +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"
@ -134,7 +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:"
@ -150,7 +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"
@ -174,12 +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"
@ -192,7 +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)
@ -212,7 +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"

35
arch/sparc/include/asm/system_64.h
View File

@ -59,20 +59,9 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
: : : "memory"); \
} while (0)
#define mb() \
membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
#define rmb() \
membar_safe("#LoadLoad")
#define wmb() \
membar_safe("#StoreStore")
#define membar_storeload() \
membar_safe("#StoreLoad")
#define membar_storeload_storestore() \
membar_safe("#StoreLoad | #StoreStore")
#define membar_storeload_loadload() \
membar_safe("#StoreLoad | #LoadLoad")
#define membar_storestore_loadstore() \
membar_safe("#StoreStore | #LoadStore")
#define mb() membar_safe("#StoreLoad")
#define rmb() __asm__ __volatile__("":::"memory")
#define wmb() __asm__ __volatile__("":::"memory")
#endif
@ -80,20 +69,20 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
#define read_barrier_depends() do { } while(0)
#define set_mb(__var, __value) \
do { __var = __value; membar_storeload_storestore(); } while(0)
do { __var = __value; membar_safe("#StoreLoad"); } while(0)
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
#else
#define smp_mb() __asm__ __volatile__("":::"memory")
#define smp_rmb() __asm__ __volatile__("":::"memory")
#define smp_wmb() __asm__ __volatile__("":::"memory")
#define smp_read_barrier_depends() do { } while(0)
#endif
#define smp_read_barrier_depends() do { } while(0)
#define flushi(addr) __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory")
#define flushw_all() __asm__ __volatile__("flushw")
@ -209,14 +198,12 @@ static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int va
unsigned long tmp1, tmp2;
__asm__ __volatile__(
" membar #StoreLoad | #LoadLoad\n"
" mov %0, %1\n"
"1: lduw [%4], %2\n"
" cas [%4], %2, %0\n"
" cmp %2, %0\n"
" bne,a,pn %%icc, 1b\n"
" mov %1, %0\n"
" membar #StoreLoad | #StoreStore\n"
: "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
: "0" (val), "r" (m)
: "cc", "memory");
@ -228,14 +215,12 @@ static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long
unsigned long tmp1, tmp2;
__asm__ __volatile__(
" membar #StoreLoad | #LoadLoad\n"
" mov %0, %1\n"
"1: ldx [%4], %2\n"
" casx [%4], %2, %0\n"
" cmp %2, %0\n"
" bne,a,pn %%xcc, 1b\n"
" mov %1, %0\n"
" membar #StoreLoad | #StoreStore\n"
: "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
: "0" (val), "r" (m)
: "cc", "memory");
@ -272,9 +257,7 @@ extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noret
static inline unsigned long
__cmpxchg_u32(volatile int *m, int old, int new)
{
__asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
"cas [%2], %3, %0\n\t"
"membar #StoreLoad | #StoreStore"
__asm__ __volatile__("cas [%2], %3, %0"
: "=&r" (new)
: "0" (new), "r" (m), "r" (old)
: "memory");
@ -285,9 +268,7 @@ __cmpxchg_u32(volatile int *m, int old, int new)
static inline unsigned long
__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
{
__asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
"casx [%2], %3, %0\n\t"
"membar #StoreLoad | #StoreStore"
__asm__ __volatile__("casx [%2], %3, %0"
: "=&r" (new)
: "0" (new), "r" (m), "r" (old)
: "memory");

6
arch/sparc/include/asm/tsb.h
View File

@ -50,8 +50,6 @@
#define TSB_TAG_INVALID_BIT 46
#define TSB_TAG_INVALID_HIGH (1 << (TSB_TAG_INVALID_BIT - 32))
#define TSB_MEMBAR membar #StoreStore
/* Some cpus support physical address quad loads. We want to use
* those if possible so we don't need to hard-lock the TSB mapping
* into the TLB. We encode some instruction patching in order to
@ -128,13 +126,11 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
cmp REG1, REG2; \
bne,pn %icc, 99b; \
nop; \
TSB_MEMBAR
#define TSB_WRITE(TSB, TTE, TAG) \
add TSB, 0x8, TSB; \
TSB_STORE(TSB, TTE); \
sub TSB, 0x8, TSB; \
TSB_MEMBAR; \
TSB_STORE(TSB, TAG);
#define KTSB_LOAD_QUAD(TSB, REG) \
@ -153,13 +149,11 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
cmp REG1, REG2; \
bne,pn %icc, 99b; \
nop; \
TSB_MEMBAR
#define KTSB_WRITE(TSB, TTE, TAG) \
add TSB, 0x8, TSB; \
stxa TTE, [TSB] ASI_N; \
sub TSB, 0x8, TSB; \
TSB_MEMBAR; \
stxa TAG, [TSB] ASI_N;
/* Do a kernel page table walk. Leaves physical PTE pointer in

11
arch/sparc64/kernel/smp.c
View File

@ -163,7 +163,7 @@ static inline long get_delta (long *rt, long *master)
for (i = 0; i < NUM_ITERS; i++) {
t0 = tick_ops->get_tick();
go[MASTER] = 1;
membar_storeload();
membar_safe("#StoreLoad");
while (!(tm = go[SLAVE]))
rmb();
go[SLAVE] = 0;
@ -257,7 +257,7 @@ static void smp_synchronize_one_tick(int cpu)
/* now let the client proceed into his loop */
go[MASTER] = 0;
membar_storeload();
membar_safe("#StoreLoad");
spin_lock_irqsave(&itc_sync_lock, flags);
{
@ -267,7 +267,7 @@ static void smp_synchronize_one_tick(int cpu)
go[MASTER] = 0;
wmb();
go[SLAVE] = tick_ops->get_tick();
membar_storeload();
membar_safe("#StoreLoad");
}
}
spin_unlock_irqrestore(&itc_sync_lock, flags);
@ -1122,7 +1122,6 @@ void smp_capture(void)
smp_processor_id());
#endif
penguins_are_doing_time = 1;
membar_storestore_loadstore();
atomic_inc(&smp_capture_registry);
smp_cross_call(&xcall_capture, 0, 0, 0);
while (atomic_read(&smp_capture_registry) != ncpus)
@ -1142,7 +1141,7 @@ void smp_release(void)
smp_processor_id());
#endif
penguins_are_doing_time = 0;
membar_storeload_storestore();
membar_safe("#StoreLoad");
atomic_dec(&smp_capture_registry);
}
}
@ -1161,7 +1160,7 @@ void smp_penguin_jailcell(int irq, struct pt_regs *regs)
__asm__ __volatile__("flushw");
prom_world(1);
atomic_inc(&smp_capture_registry);
membar_storeload_storestore();
membar_safe("#StoreLoad");
while (penguins_are_doing_time)
rmb();
atomic_dec(&smp_capture_registry);

4
arch/sparc64/kernel/trampoline.S
View File

@ -109,7 +109,6 @@ startup_continue:
*/
sethi %hi(prom_entry_lock), %g2
1: ldstub [%g2 + %lo(prom_entry_lock)], %g1
membar #StoreLoad | #StoreStore
brnz,pn %g1, 1b
nop
@ -214,7 +213,6 @@ startup_continue:
sethi %hi(prom_entry_lock), %g2
stb %g0, [%g2 + %lo(prom_entry_lock)]
membar #StoreStore | #StoreLoad
ba,pt %xcc, after_lock_tlb
nop
@ -330,7 +328,6 @@ after_lock_tlb:
sethi %hi(prom_entry_lock), %g2
1: ldstub [%g2 + %lo(prom_entry_lock)], %g1
membar #StoreLoad | #StoreStore
brnz,pn %g1, 1b
nop
@ -394,7 +391,6 @@ after_lock_tlb:
3: sethi %hi(prom_entry_lock), %g2
stb %g0, [%g2 + %lo(prom_entry_lock)]
membar #StoreStore | #StoreLoad
ldx [%l0], %g6
ldx [%g6 + TI_TASK], %g4

1
arch/sparc64/kernel/traps.c
View File

@ -1371,7 +1371,6 @@ static int cheetah_fix_ce(unsigned long physaddr)
__asm__ __volatile__("ldxa [%0] %3, %%g0\n\t"
"ldxa [%1] %3, %%g0\n\t"
"casxa [%2] %3, %%g0, %%g0\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"ldxa [%0] %3, %%g0\n\t"
"ldxa [%1] %3, %%g0\n\t"
"membar #Sync"

6
arch/sparc64/kernel/tsb.S
View File

@ -317,7 +317,7 @@ tsb_flush:
srlx %g1, 32, %o3
andcc %o3, %g2, %g0
bne,pn %icc, 1b
membar #LoadLoad
nop
cmp %g1, %o1
mov 1, %o3
bne,pt %xcc, 2f
@ -327,7 +327,7 @@ tsb_flush:
bne,pn %xcc, 1b
nop
2: retl
TSB_MEMBAR
nop
.size tsb_flush, .-tsb_flush
/* Reload MMU related context switch state at
@ -478,7 +478,7 @@ copy_tsb: /* %o0=old_tsb_base, %o1=old_tsb_size
nop
retl
TSB_MEMBAR
nop
.size copy_tsb, .-copy_tsb
/* Set the invalid bit in all TSB entries. */

26
arch/sparc64/lib/atomic.S
View File

@ -43,29 +43,10 @@ atomic_sub: /* %o0 = decrement, %o1 = atomic_ptr */
2: BACKOFF_SPIN(%o2, %o3, 1b)
.size atomic_sub, .-atomic_sub
/* On SMP we need to use memory barriers to ensure
* correct memory operation ordering, nop these out
* for uniprocessor.
*/
#ifdef CONFIG_SMP
#define ATOMIC_PRE_BARRIER membar #StoreLoad | #LoadLoad;
#define ATOMIC_POST_BARRIER \
ba,pt %xcc, 80b; \
membar #StoreLoad | #StoreStore
80: retl
nop
#else
#define ATOMIC_PRE_BARRIER
#define ATOMIC_POST_BARRIER
#endif
.globl atomic_add_ret
.type atomic_add_ret,#function
atomic_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
BACKOFF_SETUP(%o2)
ATOMIC_PRE_BARRIER
1: lduw [%o1], %g1
add %g1, %o0, %g7
cas [%o1], %g1, %g7
@ -73,7 +54,6 @@ atomic_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
bne,pn %icc, 2f
add %g7, %o0, %g7
sra %g7, 0, %o0
ATOMIC_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o2, %o3, 1b)
@ -83,7 +63,6 @@ atomic_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
.type atomic_sub_ret,#function
atomic_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */
BACKOFF_SETUP(%o2)
ATOMIC_PRE_BARRIER
1: lduw [%o1], %g1
sub %g1, %o0, %g7
cas [%o1], %g1, %g7
@ -91,7 +70,6 @@ atomic_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */
bne,pn %icc, 2f
sub %g7, %o0, %g7
sra %g7, 0, %o0
ATOMIC_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o2, %o3, 1b)
@ -131,7 +109,6 @@ atomic64_sub: /* %o0 = decrement, %o1 = atomic_ptr */
.type atomic64_add_ret,#function
atomic64_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
BACKOFF_SETUP(%o2)
ATOMIC_PRE_BARRIER
1: ldx [%o1], %g1
add %g1, %o0, %g7
casx [%o1], %g1, %g7
@ -139,7 +116,6 @@ atomic64_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
bne,pn %xcc, 2f
add %g7, %o0, %g7
mov %g7, %o0
ATOMIC_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o2, %o3, 1b)
@ -149,7 +125,6 @@ atomic64_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
.type atomic64_sub_ret,#function
atomic64_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */
BACKOFF_SETUP(%o2)
ATOMIC_PRE_BARRIER
1: ldx [%o1], %g1
sub %g1, %o0, %g7
casx [%o1], %g1, %g7
@ -157,7 +132,6 @@ atomic64_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */
bne,pn %xcc, 2f
sub %g7, %o0, %g7
mov %g7, %o0
ATOMIC_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o2, %o3, 1b)

24
arch/sparc64/lib/bitops.S
View File

@ -8,29 +8,10 @@
.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 \
ba,pt %xcc, 80b; \
membar #StoreLoad | #StoreStore
80: retl
nop
#else
#define BITOP_PRE_BARRIER
#define BITOP_POST_BARRIER
#endif
.globl test_and_set_bit
.type test_and_set_bit,#function
test_and_set_bit: /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
BITOP_PRE_BARRIER
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
@ -45,7 +26,6 @@ test_and_set_bit: /* %o0=nr, %o1=addr */
and %g7, %o2, %g2
clr %o0
movrne %g2, 1, %o0
BITOP_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
@ -55,7 +35,6 @@ test_and_set_bit: /* %o0=nr, %o1=addr */
.type test_and_clear_bit,#function
test_and_clear_bit: /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
BITOP_PRE_BARRIER
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
@ -70,7 +49,6 @@ test_and_clear_bit: /* %o0=nr, %o1=addr */
and %g7, %o2, %g2
clr %o0
movrne %g2, 1, %o0
BITOP_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
@ -80,7 +58,6 @@ test_and_clear_bit: /* %o0=nr, %o1=addr */
.type test_and_change_bit,#function
test_and_change_bit: /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
BITOP_PRE_BARRIER
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
@ -95,7 +72,6 @@ test_and_change_bit: /* %o0=nr, %o1=addr */
and %g7, %o2, %g2
clr %o0
movrne %g2, 1, %o0
BITOP_POST_BARRIER
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)

7
arch/sparc64/lib/rwsem.S
View File

@ -17,7 +17,6 @@ __down_read:
bne,pn %icc, 1b
add %g7, 1, %g7
cmp %g7, 0
membar #StoreLoad | #StoreStore
bl,pn %icc, 3f
nop
2:
@ -42,7 +41,6 @@ __down_read_trylock:
cmp %g1, %g7
bne,pn %icc, 1b
mov 1, %o1
membar #StoreLoad | #StoreStore
2: retl
mov %o1, %o0
.size __down_read_trylock, .-__down_read_trylock
@ -58,7 +56,6 @@ __down_write:
cmp %g3, %g7
bne,pn %icc, 1b
cmp %g7, 0
membar #StoreLoad | #StoreStore
bne,pn %icc, 3f
nop
2: retl
@ -85,7 +82,6 @@ __down_write_trylock:
cmp %g3, %g7
bne,pn %icc, 1b
mov 1, %o1
membar #StoreLoad | #StoreStore
2: retl
mov %o1, %o0
.size __down_write_trylock, .-__down_write_trylock
@ -99,7 +95,6 @@ __up_read:
cmp %g1, %g7
bne,pn %icc, 1b
cmp %g7, 0
membar #StoreLoad | #StoreStore
bl,pn %icc, 3f
nop
2: retl
@ -129,7 +124,6 @@ __up_write:
bne,pn %icc, 1b
sub %g7, %g1, %g7
cmp %g7, 0
membar #StoreLoad | #StoreStore
bl,pn %icc, 3f
nop
2:
@ -155,7 +149,6 @@ __downgrade_write:
bne,pn %icc, 1b
sub %g7, %g1, %g7
cmp %g7, 0
membar #StoreLoad | #StoreStore
bl,pn %icc, 3f
nop
2:

2
arch/sparc64/mm/init.c
View File

@ -214,7 +214,6 @@ static inline void set_dcache_dirty(struct page *page, int this_cpu)
"or %%g1, %0, %%g1\n\t"
"casx [%2], %%g7, %%g1\n\t"
"cmp %%g7, %%g1\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"bne,pn %%xcc, 1b\n\t"
" nop"
: /* no outputs */
@ -236,7 +235,6 @@ static inline void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
" andn %%g7, %1, %%g1\n\t"
"casx [%2], %%g7, %%g1\n\t"
"cmp %%g7, %%g1\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"bne,pn %%xcc, 1b\n\t"
" nop\n"
"2:"

4
arch/sparc64/mm/tsb.c
View File

@ -41,10 +41,8 @@ void flush_tsb_kernel_range(unsigned long start, unsigned long end)
KERNEL_TSB_NENTRIES);
struct tsb *ent = &swapper_tsb[hash];
if (tag_compare(ent->tag, v)) {
if (tag_compare(ent->tag, v))
ent->tag = (1UL << TSB_TAG_INVALID_BIT);
membar_storeload_storestore();
}
}
}

2
arch/sparc64/mm/ultra.S
View File

@ -125,7 +125,6 @@ __spitfire_flush_tlb_mm_slow:
.align 32
.globl __flush_icache_page
__flush_icache_page: /* %o0 = phys_page */
membar #StoreStore
srlx %o0, PAGE_SHIFT, %o0
sethi %uhi(PAGE_OFFSET), %g1
sllx %o0, PAGE_SHIFT, %o0
@ -507,7 +506,6 @@ xcall_fetch_glob_regs:
sllx %g2, TRAP_BLOCK_SZ_SHIFT, %g2
add %g7, %g2, %g7
ldx [%g7 + TRAP_PER_CPU_THREAD], %g3
membar #StoreStore
stx %g3, [%g1 + GR_SNAP_THREAD]
retry