From: Will Deacon Date: Tue, 21 Aug 2012 14:33:19 +0000 (+0100) Subject: ARM: cacheflush: don't round address range up to nearest page X-Git-Tag: v3.12-rc1~128^2^3^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d9524dc32cab52714dee0c8e59c7437ee33a239a;p=linux.git 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 For historical reference, the interesting commits in history.git are: 10eacf1775e1 ("[ARM] Clean up ARM cache handling interfaces (part 1)") 71432e79b76b ("[ARM] Add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 Reported-by: Jonathan Austin Signed-off-by: Will Deacon --- 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