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authorWill Deacon <will.deacon@arm.com>2012-08-21 15:33:19 +0100
committerWill Deacon <will.deacon@arm.com>2013-08-20 11:54:54 +0100
commitd9524dc32cab52714dee0c8e59c7437ee33a239a (patch)
tree09c0171cdc043daae67b6cbfc3a25e30bf53a4cc
parent28256d612726a28a8b9d3c49f2b74198c4423d6a (diff)
ARM: cacheflush: don't round address range up to nearest page
The flush_cache_user_range macro takes a pair of addresses describing the start and end of the virtual address range to flush. Due to an accidental oversight when flush_cache_range_user was introduced, the address range was rounded up so that the start and end addresses were page-aligned. For historical reference, the interesting commits in history.git are: 10eacf1775e1 ("[ARM] Clean up ARM cache handling interfaces (part 1)") 71432e79b76b ("[ARM] Add flush_cache_user_page() for sys_cacheflush()") This patch removes the alignment code, reducing the amount of flushing required for ranges that are not an exact multiple of PAGE_SIZE. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
-rw-r--r--arch/arm/include/asm/cacheflush.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index 17d0ae8672fa..bfd37e58f855 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -268,8 +268,7 @@ extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr
* Harvard caches are synchronised for the user space address range.
* This is used for the ARM private sys_cacheflush system call.
*/
-#define flush_cache_user_range(start,end) \
- __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end))
+#define flush_cache_user_range(s,e) __cpuc_coherent_user_range(s,e)
/*
* Perform necessary cache operations to ensure that data previously