diff options
| author | Sasha Levin <sasha.levin@oracle.com> | 2014-01-23 15:52:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-23 16:36:50 -0800 |
| commit | 309381feaee564281c3d9e90fbca8963bb7428ad (patch) | |
| tree | 7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /include/linux/pagemap.h | |
| parent | e3bba3c3c90cd434c1ccb9e5dc704a96baf9541c (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.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index e3dea75a078..1710d1b060b 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); |