The patch titled
Subject: arm64: turn flush_dcache_mmap_lock into a no-op
has been added to the -mm tree. Its filename is
arm64-turn-flush_dcache_mmap_lock-into-a-no-op.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-turn-flush_dcache_mmap_lock-into-a-no-op.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-turn-flush_dcache_mmap_lock-into-a-no-op.patch
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------------------------------------------------------
From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Reviewed-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/cacheflush.h | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff -puN arch/arm64/include/asm/cacheflush.h~arm64-turn-flush_dcache_mmap_lock-into-a-no-op arch/arm64/include/asm/cacheflush.h
--- a/arch/arm64/include/asm/cacheflush.h~arm64-turn-flush_dcache_mmap_lock-into-a-no-op
+++ a/arch/arm64/include/asm/cacheflush.h
@@ -137,10 +137,8 @@ static inline void __flush_icache_all(vo
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
_
Patches currently in -mm which might be from mawilcox@xxxxxxxxxxxxx are
radix-tree-use-gfp_zonemask-bits-of-gfp_t-for-flags.patch
arm64-turn-flush_dcache_mmap_lock-into-a-no-op.patch
unicore32-turn-flush_dcache_mmap_lock-into-a-no-op.patch
export-__set_page_dirty.patch
fscache-use-appropriate-radix-tree-accessors.patch
xarray-add-the-xa_lock-to-the-radix_tree_root.patch
page-cache-use-xa_lock.patch
autofs4-use-wait_event_killable.patch
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