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authorSasha Levin <sasha.levin@oracle.com>2014-01-24 00:52:54 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-24 01:36:50 +0100
commit309381feaee564281c3d9e90fbca8963bb7428ad (patch)
tree7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /mm/migrate.c
parentfs/proc/page.c: add PageAnon check to surely detect thp (diff)
downloadlinux-309381feaee564281c3d9e90fbca8963bb7428ad.tar.xz
linux-309381feaee564281c3d9e90fbca8963bb7428ad.zip
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
Most of the VM_BUG_ON assertions are performed on a page. Usually, when one of these assertions fails we'll get a BUG_ON with a call stack and the registers. I've recently noticed based on the requests to add a small piece of code that dumps the page to various VM_BUG_ON sites that the page dump is quite useful to people debugging issues in mm. This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what VM_BUG_ON() does, also dumps the page before executing the actual BUG_ON. [akpm@linux-foundation.org: fix up includes] Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index a8025befc323..4b3996eb7f0f 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -499,7 +499,7 @@ void migrate_page_copy(struct page *newpage, struct page *page)
if (PageUptodate(page))
SetPageUptodate(newpage);
if (TestClearPageActive(page)) {
- VM_BUG_ON(PageUnevictable(page));
+ VM_BUG_ON_PAGE(PageUnevictable(page), page);
SetPageActive(newpage);
} else if (TestClearPageUnevictable(page))
SetPageUnevictable(newpage);
@@ -871,7 +871,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
* free the metadata, so the page can be freed.
*/
if (!page->mapping) {
- VM_BUG_ON(PageAnon(page));
+ VM_BUG_ON_PAGE(PageAnon(page), page);
if (page_has_private(page)) {
try_to_free_buffers(page);
goto uncharge;
@@ -1618,7 +1618,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
{
int page_lru;
- VM_BUG_ON(compound_order(page) && !PageTransHuge(page));
+ VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page), page);
/* Avoid migrating to a node that is nearly full */
if (!migrate_balanced_pgdat(pgdat, 1UL << compound_order(page)))