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| author | Simon Baatz <gmbnomis@gmail.com> | 2013-06-10 21:10:12 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-06-17 10:30:52 +0100 |
| commit | 1bc39742aab09248169ef9d3727c9def3528b3f3 (patch) | |
| tree | 50179be222c15d5e06f77928331d63843f6fc738 /arch/arm/include | |
| parent | 049be07053ebbf0ee8543caea23ae7bdf0765bb2 (diff) | |
| download | lwn-1bc39742aab09248169ef9d3727c9def3528b3f3.tar.gz lwn-1bc39742aab09248169ef9d3727c9def3528b3f3.zip | |
ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page
Commit f8b63c1 made flush_kernel_dcache_page a no-op assuming that
the pages it needs to handle are kernel mapped only. However, for
example when doing direct I/O, pages with user space mappings may
occur.
Thus, continue to do lazy flushing if there are no user space
mappings. Otherwise, flush the kernel cache lines directly.
Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org> # 3.2+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/cacheflush.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h index bff71388e72a..17d0ae8672fa 100644 --- a/arch/arm/include/asm/cacheflush.h +++ b/arch/arm/include/asm/cacheflush.h @@ -320,9 +320,7 @@ static inline void flush_anon_page(struct vm_area_struct *vma, } #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE -static inline void flush_kernel_dcache_page(struct page *page) -{ -} +extern void flush_kernel_dcache_page(struct page *); #define flush_dcache_mmap_lock(mapping) \ spin_lock_irq(&(mapping)->tree_lock) |