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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-12-30 23:17:40 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-01-08 19:49:58 +0000
commit6020dff09252e3670a89edb36baaa4afb9b10d15 (patch)
treee242232e97e71045f51bda9e0a5bb2e8f8df1c29 /include
parenta6f36be32622730710b2fadacb6e2649defa4371 (diff)
downloadop-kernel-dev-6020dff09252e3670a89edb36baaa4afb9b10d15.zip
op-kernel-dev-6020dff09252e3670a89edb36baaa4afb9b10d15.tar.gz
[ARM] Resolve fuse and direct-IO failures due to missing cache flushes
fuse does not work on ARM due to cache incoherency issues - fuse wants to use get_user_pages() to copy data from the current process into kernel space. However, since this accesses userspace via the kernel mapping, the kernel mapping can be out of date wrt data written to userspace. This can lead to unpredictable behaviour (in the case of fuse) or data corruption for direct-IO. This resolves debian bug #402876 Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/asm-arm/cacheflush.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-arm/cacheflush.h b/include/asm-arm/cacheflush.h
index d510495..5f531ea 100644
--- a/include/asm-arm/cacheflush.h
+++ b/include/asm-arm/cacheflush.h
@@ -357,6 +357,16 @@ extern void flush_dcache_page(struct page *);
extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
+#define ARCH_HAS_FLUSH_ANON_PAGE
+static inline void flush_anon_page(struct vm_area_struct *vma,
+ struct page *page, unsigned long vmaddr)
+{
+ extern void __flush_anon_page(struct vm_area_struct *vma,
+ struct page *, unsigned long);
+ if (PageAnon(page))
+ __flush_anon_page(vma, page, vmaddr);
+}
+
#define flush_dcache_mmap_lock(mapping) \
write_lock_irq(&(mapping)->tree_lock)
#define flush_dcache_mmap_unlock(mapping) \
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