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authorMarek Szyprowski <m.szyprowski@samsung.com>2012-12-20 15:05:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-20 17:40:19 -0800
commitbcc2b02f4c1b36bc67272df7119b75bac78525ab (patch)
treedb4b0ad1693c2b25da06655b6e7dd409c85ec120 /mm/page_alloc.c
parentb66c5984017533316fd1951770302649baf1aa33 (diff)
downloadlinux-bcc2b02f4c1b36bc67272df7119b75bac78525ab.tar.gz
mm: cma: WARN if freed memory is still in use
Memory returned to free_contig_range() must have no other references. Let kernel to complain loudly if page reference count is not equal to 1. [rientjes@google.com: support sparsemem] Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2ad2ad168ef..4ba5e37127f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5978,8 +5978,15 @@ done:
void free_contig_range(unsigned long pfn, unsigned nr_pages)
{
- for (; nr_pages--; ++pfn)
- __free_page(pfn_to_page(pfn));
+ unsigned int count = 0;
+
+ for (; nr_pages--; pfn++) {
+ struct page *page = pfn_to_page(pfn);
+
+ count += page_count(page) != 1;
+ __free_page(page);
+ }
+ WARN(count != 0, "%d pages are still in use!\n", count);
}
#endif