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MIPS: Flush dcache for flush_kernel_dcache_page

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The flush_kernel_dcache_page function was previously essentially a nop.
This is incorrect for MIPS, where if a page has been modified & either
it aliases or it's executable & the icache doesn't fill from dcache then
the content needs to be written back from dcache to the next level of
the cache hierarchy (which is shared with the icache).

Implement this by simply calling flush_dcache_page, treating this
kmapped cache flush function (flush_kernel_dcache_page) exactly the same
as its non-kmapped counterpart (flush_dcache_page).

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Lars Persson <lars.persson@axis.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12719/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2016-03-01 02:37:56 +00:00 committed by Ralf Baechle
parent b4f37b2f2f
commit 763fee97e7
1 changed files with 1 additions and 0 deletions
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1
arch/mips/include/asm/cacheflush.h
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@ -132,6 +132,7 @@ static inline void kunmap_noncoherent(void)
static inline void flush_kernel_dcache_page(struct page *page)
{
BUG_ON(cpu_has_dc_aliases && PageHighMem(page));
flush_dcache_page(page);
}
/*