diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-06-02 17:18:17 +0100 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2010-10-13 14:18:02 -0700 |
| commit | 6728ce823f92394fa561a3c00aa6d6d42b535718 (patch) | |
| tree | 8bbd84c24c846b8e92554fc93019bfd4a50af694 /arch/arm/include/asm | |
| parent | 6a22a898ba6cf82ddf94bf998fb1475f259a4482 (diff) | |
ARM: Use lazy cache flushing on ARMv7 SMP systems
ARMv7 processors like Cortex-A9 broadcast the cache maintenance
operations in hardware. This patch allows the
flush_dcache_page/update_mmu_cache pair to work in lazy flushing mode
similar to the UP case.
Note that cache flushing on SMP systems now takes place via the
set_pte_at() call (__sync_icache_dcache) and there is no race with other
CPUs executing code from the new PTE before the cache flushing took
place.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Rabin Vincent <rabin.vincent@stericsson.com>
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/smp_plat.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h index e6215305544a..963a338d567b 100644 --- a/arch/arm/include/asm/smp_plat.h +++ b/arch/arm/include/asm/smp_plat.h @@ -13,9 +13,13 @@ static inline int tlb_ops_need_broadcast(void) return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2; } +#if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7 +#define cache_ops_need_broadcast() 0 +#else static inline int cache_ops_need_broadcast(void) { return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 1; } +#endif #endif |