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authorSasha Levin <sasha.levin@oracle.com>2014-01-23 15:52:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:50 -0800
commit309381feaee564281c3d9e90fbca8963bb7428ad (patch)
tree7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /include/linux/pagemap.h
parente3bba3c3c90cd434c1ccb9e5dc704a96baf9541c (diff)
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 'include/linux/pagemap.h')
-rw-r--r--include/linux/pagemap.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e3dea75a078b..1710d1b060ba 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -162,7 +162,7 @@ static inline int page_cache_get_speculative(struct page *page)
* disabling preempt, and hence no need for the "speculative get" that
* SMP requires.
*/
- VM_BUG_ON(page_count(page) == 0);
+ VM_BUG_ON_PAGE(page_count(page) == 0, page);
atomic_inc(&page->_count);
#else
@@ -175,7 +175,7 @@ static inline int page_cache_get_speculative(struct page *page)
return 0;
}
#endif
- VM_BUG_ON(PageTail(page));
+ VM_BUG_ON_PAGE(PageTail(page), page);
return 1;
}
@@ -191,14 +191,14 @@ static inline int page_cache_add_speculative(struct page *page, int count)
# ifdef CONFIG_PREEMPT_COUNT
VM_BUG_ON(!in_atomic());
# endif
- VM_BUG_ON(page_count(page) == 0);
+ VM_BUG_ON_PAGE(page_count(page) == 0, page);
atomic_add(count, &page->_count);
#else
if (unlikely(!atomic_add_unless(&page->_count, count, 0)))
return 0;
#endif
- VM_BUG_ON(PageCompound(page) && page != compound_head(page));
+ VM_BUG_ON_PAGE(PageCompound(page) && page != compound_head(page), page);
return 1;
}
@@ -210,7 +210,7 @@ static inline int page_freeze_refs(struct page *page, int count)
static inline void page_unfreeze_refs(struct page *page, int count)
{
- VM_BUG_ON(page_count(page) != 0);
+ VM_BUG_ON_PAGE(page_count(page) != 0, page);
VM_BUG_ON(count == 0);
atomic_set(&page->_count, count);