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authorHugh Dickins <hugh@veritas.com>2005-10-29 18:16:36 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-29 21:40:42 -0700
commit92dc6fcc845d99e87d8168e0786796525832d130 (patch)
treeac36da7e3dc3e0ba62d4139443beb7eb7c25288d /arch/parisc/kernel/cache.c
parent69b0475456ff7ef520e16f69d7a15c0d68b74e64 (diff)
downloadlinux-92dc6fcc845d99e87d8168e0786796525832d130.tar.gz
[PATCH] mm: parisc pte atomicity
There's a worrying function translation_exists in parisc cacheflush.h, unaffected by split ptlock since flush_dcache_page is using it on some other mm, without any relevant lock. Oh well, make it a slightly more robust by factoring the pfn check within it. And it looked liable to confuse a camouflaged swap or file entry with a good pte: fix that too. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/parisc/kernel/cache.c')
-rw-r--r--arch/parisc/kernel/cache.c24
1 files changed, 9 insertions, 15 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index e15f09eaed1..a065349aee3 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -270,7 +270,6 @@ void flush_dcache_page(struct page *page)
unsigned long offset;
unsigned long addr;
pgoff_t pgoff;
- pte_t *pte;
unsigned long pfn = page_to_pfn(page);
@@ -301,21 +300,16 @@ void flush_dcache_page(struct page *page)
* taking a page fault if the pte doesn't exist.
* This is just for speed. If the page translation
* isn't there, there's no point exciting the
- * nadtlb handler into a nullification frenzy */
-
-
- if(!(pte = translation_exists(mpnt, addr)))
- continue;
-
- /* make sure we really have this page: the private
+ * nadtlb handler into a nullification frenzy.
+ *
+ * Make sure we really have this page: the private
* mappings may cover this area but have COW'd this
- * particular page */
- if(pte_pfn(*pte) != pfn)
- continue;
-
- __flush_cache_page(mpnt, addr);
-
- break;
+ * particular page.
+ */
+ if (translation_exists(mpnt, addr, pfn)) {
+ __flush_cache_page(mpnt, addr);
+ break;
+ }
}
flush_dcache_mmap_unlock(mapping);
}