diff options
Diffstat (limited to 'arch/tile/include')
| -rw-r--r-- | arch/tile/include/asm/atomic_64.h | 17 | ||||
| -rw-r--r-- | arch/tile/include/asm/pgtable.h | 1 | ||||
| -rw-r--r-- | arch/tile/include/uapi/asm/unistd.h | 1 |
3 files changed, 16 insertions, 3 deletions
diff --git a/arch/tile/include/asm/atomic_64.h b/arch/tile/include/asm/atomic_64.h index 51cabc26e387..b0531a623653 100644 --- a/arch/tile/include/asm/atomic_64.h +++ b/arch/tile/include/asm/atomic_64.h @@ -37,12 +37,25 @@ static inline void atomic_add(int i, atomic_t *v) __insn_fetchadd4((void *)&v->counter, i); } +/* + * Note a subtlety of the locking here. We are required to provide a + * full memory barrier before and after the operation. However, we + * only provide an explicit mb before the operation. After the + * operation, we use barrier() to get a full mb for free, because: + * + * (1) The barrier directive to the compiler prohibits any instructions + * being statically hoisted before the barrier; + * (2) the microarchitecture will not issue any further instructions + * until the fetchadd result is available for the "+ i" add instruction; + * (3) the smb_mb before the fetchadd ensures that no other memory + * operations are in flight at this point. + */ static inline int atomic_add_return(int i, atomic_t *v) { int val; smp_mb(); /* barrier for proper semantics */ val = __insn_fetchadd4((void *)&v->counter, i) + i; - barrier(); /* the "+ i" above will wait on memory */ + barrier(); /* equivalent to smp_mb(); see block comment above */ return val; } @@ -95,7 +108,7 @@ static inline long atomic64_add_return(long i, atomic64_t *v) int val; smp_mb(); /* barrier for proper semantics */ val = __insn_fetchadd((void *)&v->counter, i) + i; - barrier(); /* the "+ i" above will wait on memory */ + barrier(); /* equivalent to smp_mb; see atomic_add_return() */ return val; } diff --git a/arch/tile/include/asm/pgtable.h b/arch/tile/include/asm/pgtable.h index 96cecf55522e..2a26cc4fefc2 100644 --- a/arch/tile/include/asm/pgtable.h +++ b/arch/tile/include/asm/pgtable.h @@ -487,7 +487,6 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) } #ifdef CONFIG_TRANSPARENT_HUGEPAGE -#define has_transparent_hugepage() 1 #define pmd_trans_huge pmd_huge_page #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ diff --git a/arch/tile/include/uapi/asm/unistd.h b/arch/tile/include/uapi/asm/unistd.h index 3866397aaf5a..24e9187e85a8 100644 --- a/arch/tile/include/uapi/asm/unistd.h +++ b/arch/tile/include/uapi/asm/unistd.h @@ -12,6 +12,7 @@ * more details. */ +#define __ARCH_WANT_RENAMEAT #if !defined(__LP64__) || defined(__SYSCALL_COMPAT) /* Use the flavor of this syscall that matches the 32-bit API better. */ #define __ARCH_WANT_SYNC_FILE_RANGE2 |