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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 /mm/swap_state.c
parente3bba3c3c90cd434c1ccb9e5dc704a96baf9541c (diff)
downloadop-kernel-dev-309381feaee564281c3d9e90fbca8963bb7428ad.zip
op-kernel-dev-309381feaee564281c3d9e90fbca8963bb7428ad.tar.gz
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/swap_state.c')
-rw-r--r--mm/swap_state.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index e6f15f8..98e85e9 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -83,9 +83,9 @@ int __add_to_swap_cache(struct page *page, swp_entry_t entry)
int error;
struct address_space *address_space;
- VM_BUG_ON(!PageLocked(page));
- VM_BUG_ON(PageSwapCache(page));
- VM_BUG_ON(!PageSwapBacked(page));
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_PAGE(PageSwapCache(page), page);
+ VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
page_cache_get(page);
SetPageSwapCache(page);
@@ -139,9 +139,9 @@ void __delete_from_swap_cache(struct page *page)
swp_entry_t entry;
struct address_space *address_space;
- VM_BUG_ON(!PageLocked(page));
- VM_BUG_ON(!PageSwapCache(page));
- VM_BUG_ON(PageWriteback(page));
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_PAGE(!PageSwapCache(page), page);
+ VM_BUG_ON_PAGE(PageWriteback(page), page);
entry.val = page_private(page);
address_space = swap_address_space(entry);
@@ -165,8 +165,8 @@ int add_to_swap(struct page *page, struct list_head *list)
swp_entry_t entry;
int err;
- VM_BUG_ON(!PageLocked(page));
- VM_BUG_ON(!PageUptodate(page));
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_PAGE(!PageUptodate(page), page);
entry = get_swap_page();
if (!entry.val)
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