X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fhighmem.h;h=7153aef34d5c21dfd21fe9723b698bc0528e631d;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=232d8fdb557c85723bc9fa41ad5e3b68f3b46230;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 232d8fdb5..7153aef34 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -40,6 +40,8 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
 	void *addr = kmap_atomic(page, KM_USER0);
 	clear_user_page(addr, vaddr, page);
 	kunmap_atomic(addr, KM_USER0);
+	/* Make sure this page is cleared on other CPU's too before using it */
+	smp_wmb();
 }
 
 static inline void clear_highpage(struct page *page)
@@ -73,6 +75,8 @@ static inline void copy_user_highpage(struct page *to, struct page *from, unsign
 	copy_user_page(vto, vfrom, vaddr, to);
 	kunmap_atomic(vfrom, KM_USER0);
 	kunmap_atomic(vto, KM_USER1);
+	/* Make sure this page is cleared on other CPU's too before using it */
+	smp_wmb();
 }
 
 static inline void copy_highpage(struct page *to, struct page *from)