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| author | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-23 19:05:52 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-23 19:05:52 +0100 |
| commit | ee6a7fce8e5ecd90794ad7c9f62518c753fb3cb6 (patch) | |
| tree | 13705ac63db9a8eb4cc80418ea109fddf7f6fef0 /arch/arm64/include/asm/cacheflush.h | |
| parent | arm64: Enable HIBERNATION in defconfig (diff) | |
| download | linux-ee6a7fce8e5ecd90794ad7c9f62518c753fb3cb6.tar.xz linux-ee6a7fce8e5ecd90794ad7c9f62518c753fb3cb6.zip | |
arm64: Remove I-cache invalidation from flush_cache_range()
The flush_cache_range() function (similarly for flush_cache_page()) is
called when the kernel is changing an existing VA->PA mapping range to
either a new PA or to different attributes. Since ARMv8 has PIPT-like
D-caches, this function does not need to perform any D-cache
maintenance. The I-cache maintenance is already handled via set_pte_at()
and flush_cache_range() cannot anyway guarantee that there are no cache
lines left after invalidation due to the speculative loads.
This patch makes flush_cache_range() a no-op.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cacheflush.h')
| -rw-r--r-- | arch/arm64/include/asm/cacheflush.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index e9f64ecb75ce..5a2a6ee65f65 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -65,7 +65,6 @@ * - kaddr - page address * - size - region size */ -extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); extern void flush_icache_range(unsigned long start, unsigned long end); extern void __flush_dcache_area(void *addr, size_t len); extern void __clean_dcache_area_poc(void *addr, size_t len); @@ -82,6 +81,11 @@ static inline void flush_cache_page(struct vm_area_struct *vma, { } +static inline void flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ +} + /* * Cache maintenance functions used by the DMA API. No to be used directly. */ |