The patch titled
Subject: mm: cma: WARN if freed memory is still in use
has been added to the -mm tree. Its filename is
mm-cma-warn-if-freed-memory-is-still-in-use.patch
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------------------------------------------------------
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Subject: 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.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff -puN mm/page_alloc.c~mm-cma-warn-if-freed-memory-is-still-in-use mm/page_alloc.c
--- a/mm/page_alloc.c~mm-cma-warn-if-freed-memory-is-still-in-use
+++ a/mm/page_alloc.c
@@ -5929,8 +5929,13 @@ done:
void free_contig_range(unsigned long pfn, unsigned nr_pages)
{
- for (; nr_pages--; ++pfn)
- __free_page(pfn_to_page(pfn));
+ struct page *page = pfn_to_page(pfn);
+ int count = 0;
+ for (; nr_pages--; page++) {
+ count += page_count(page) != 1;
+ __free_page(page);
+ }
+ WARN(count != 0, "%d pages are still in use!\n", count);
}
#endif
_
Patches currently in -mm which might be from m.szyprowski@xxxxxxxxxxx are
linux-next.patch
mm-cma-skip-watermarks-check-for-already-isolated-blocks-in-split_free_page.patch
mm-cma-remove-watermark-hacks.patch
mm-cma-warn-if-freed-memory-is-still-in-use.patch
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