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| author | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-23 21:05:52 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-23 21:05:52 +0300 |
| commit | ee6a7fce8e5ecd90794ad7c9f62518c753fb3cb6 (patch) | |
| tree | 13705ac63db9a8eb4cc80418ea109fddf7f6fef0 /arch/arm64/mm/flush.c | |
| parent | 833a9f4b5c6103f7e9f24f626bee6265e333cff8 (diff) | |
| download | linux-ee6a7fce8e5ecd90794ad7c9f62518c753fb3cb6.tar.xz | |
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/mm/flush.c')
| -rw-r--r-- | arch/arm64/mm/flush.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index 2d78d5a9b89f..554a2558c12e 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -25,13 +25,6 @@ #include <asm/cachetype.h> #include <asm/tlbflush.h> -void flush_cache_range(struct vm_area_struct *vma, unsigned long start, - unsigned long end) -{ - if (vma->vm_flags & VM_EXEC) - __flush_icache_all(); -} - void sync_icache_aliases(void *kaddr, unsigned long len) { unsigned long addr = (unsigned long)kaddr; |