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authorCatalin Marinas <catalin.marinas@arm.com>2013-05-01 16:34:22 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-09 12:24:27 -0800
commitfc54900e08d840fcfec9e5d2fba2c6f233aa49b9 (patch)
tree02544fb3318f7a5430b72302dfc1e0553190a7a2 /arch
parent1e616427f20943c9966296dfff9e7a2b825846aa (diff)
downloadlinaro-lsk-fc54900e08d840fcfec9e5d2fba2c6f233aa49b9.tar.gz
arm64: Do not flush the D-cache for anonymous pages
commit 7249b79f6b4cc3c2aa9138dca52e535a4c789107 upstream. The D-cache on AArch64 is VIPT non-aliasing, so there is no need to flush it for anonymous pages. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Will Deacon <will.deacon@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/mm/flush.c8
-rw-r--r--arch/arm64/mm/mmu.c1
2 files changed, 3 insertions, 6 deletions
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index b9cd7a4deec..7c716634a67 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -77,14 +77,12 @@ void __flush_dcache_page(struct page *page)
void __sync_icache_dcache(pte_t pte, unsigned long addr)
{
- unsigned long pfn;
- struct page *page;
+ struct page *page = pte_page(pte);
- pfn = pte_pfn(pte);
- if (!pfn_valid(pfn))
+ /* no flushing needed for anonymous pages */
+ if (!page_mapping(page))
return;
- page = pfn_to_page(pfn);
if (!test_and_set_bit(PG_dcache_clean, &page->flags)) {
__flush_dcache_page(page);
__flush_icache_all();
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index eeecc9c8ed6..80a369eab63 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -339,7 +339,6 @@ void __init paging_init(void)
bootmem_init();
empty_zero_page = virt_to_page(zero_page);
- __flush_dcache_page(empty_zero_page);
/*
* TTBR0 is only used for the identity mapping at this stage. Make it