From 34ae8e3688fb8af2afaf52b78c6f20c74c6ae650 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Thu, 28 Jan 2016 14:26:00 +0100 Subject: [PATCH] MIPS: highmem: Turn flush_cache_kmaps into a no-op. It was calling flush_cache_all() which is a no-op since a long time anyway and which was overkill in the old days when it was actually doing something because only the D-cache needs to be flushed, never the I-cache, never the S-cache. Since however highmem on MIPS is still only supported on processors that don't suffer from cache aliases, we could turn flush_cache_kmaps() into a no-op - but for paranoia's sake we rather make it BUG_ON(cpu_has_dc_aliases()). Signed-off-by: Ralf Baechle --- arch/mips/include/asm/highmem.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h index 01880b34a209..64f2500d891b 100644 --- a/arch/mips/include/asm/highmem.h +++ b/arch/mips/include/asm/highmem.h @@ -19,8 +19,10 @@ #ifdef __KERNEL__ +#include #include #include +#include #include /* undef for production */ @@ -50,7 +52,7 @@ extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); -#define flush_cache_kmaps() flush_cache_all() +#define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) extern void kmap_init(void);