Commit 00a19f3e authored Nov 08, 2016 by Rabin Vincent Committed by Russell King Jan 10, 2017

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
b5b6c9e9 ("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>

parent 7ce7d89f

arch/arm/mm/flush.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -327,6 +327,12 @@ void flush_dcache_page(struct page *page)
		if (page == ZERO_PAGE(0))
		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);

		if (!cache_ops_need_broadcast() &&