From d339d705f7024d602b1449e36e53451a0fcde9fa Mon Sep 17 00:00:00 2001 From: Matthew Wilcox Date: Tue, 10 Apr 2018 16:36:40 -0700 Subject: [PATCH] unicore32: turn flush_dcache_mmap_lock into a no-op Unicore 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/20180313132639.17387-5-willy@infradead.org Signed-off-by: Matthew Wilcox Cc: Darrick J. Wong Cc: Dave Chinner Cc: Jeff Layton Cc: Ryusuke Konishi Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/unicore32/include/asm/cacheflush.h | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/unicore32/include/asm/cacheflush.h b/arch/unicore32/include/asm/cacheflush.h index a5e08e2d5d6d..1d9132b66039 100644 --- a/arch/unicore32/include/asm/cacheflush.h +++ b/arch/unicore32/include/asm/cacheflush.h @@ -170,10 +170,8 @@ extern void flush_cache_page(struct vm_area_struct *vma, #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 extern void flush_dcache_page(struct page *); -#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) #define flush_icache_user_range(vma, page, addr, len) \ flush_dcache_page(page) -- GitLab