From 763fee97e743acb4f6e683a00fd2e7f5ad2484fb Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Tue, 1 Mar 2016 02:37:56 +0000 Subject: [PATCH] MIPS: Flush dcache for flush_kernel_dcache_page 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 Cc: Lars Persson 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 --- arch/mips/include/asm/cacheflush.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h index 723229f4cf27..7e9f46818eba 100644 --- a/arch/mips/include/asm/cacheflush.h +++ b/arch/mips/include/asm/cacheflush.h @@ -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); } /* -- 2.39.2