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authorMatthew Wilcox <mawilcox@microsoft.com>2018-04-10 16:36:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 10:28:39 -0700
commit427c896f262ad70d1e6b04890945675df13bb031 (patch)
tree0ca5f263e7bc2a7f5bca23d8f92401324e26666c
parent60a052719af6cf34cee53c6b93b2d31cfc795de7 (diff)
arm64: turn flush_dcache_mmap_lock into a no-op
ARM64 doesn't walk the VMA tree in its flush_dcache_page() implementation, so has no need to take the tree_lock. Link: http://lkml.kernel.org/r/20180313132639.17387-4-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Jeff Layton <jlayton@kernel.org> Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/arm64/include/asm/cacheflush.h6
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 7dfcec4700fe..0094c6653b06 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -140,10 +140,8 @@ static inline void __flush_icache_all(void)
dsb(ish);
}
-#define flush_dcache_mmap_lock(mapping) \
- spin_lock_irq(&(mapping)->tree_lock)
-#define flush_dcache_mmap_unlock(mapping) \
- spin_unlock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_lock(mapping) do { } while (0)
+#define flush_dcache_mmap_unlock(mapping) do { } while (0)
/*
* We don't appear to need to do anything here. In fact, if we did, we'd