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ARM: 8627/1: avoid cache flushing in flush_dcache_page() 

When the data cache is PIPT or VIPT non-aliasing, and cache operations
are broadcast by the hardware, we can always postpone the flush in
flush_dcache_page().  A similar change was done for ARM64 in commit
b5b6c9e914 ("arm64: Avoid cache flushing in flush_dcache_page()").

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2016-11-08 09:21:19 +01:00 committed by Russell King
parent 7ce7d89f48
commit 00a19f3e25
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mm/flush.c
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@ -327,6 +327,12 @@ void flush_dcache_page(struct page *page)
if (page == ZERO_PAGE(0)) if (page == ZERO_PAGE(0))
return; return;
if (!cache_ops_need_broadcast() && cache_is_vipt_nonaliasing()) {
if (test_bit(PG_dcache_clean, &page->flags))
clear_bit(PG_dcache_clean, &page->flags);
return;
}
mapping = page_mapping(page); mapping = page_mapping(page);
if (!cache_ops_need_broadcast() && if (!cache_ops_need_broadcast() &&