lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] mm: VM_BUG_ON

Browse Source 
Introduce a VM_BUG_ON, which is turned on with CONFIG_DEBUG_VM.  Use this
in the lightweight, inline refcounting functions; PageLRU and PageActive
checks in vmscan, because they're pretty well confined to vmscan.  And in
page allocate/free fastpaths which can be the hottest parts of the kernel
for kbuilds.

Unlike BUG_ON, VM_BUG_ON must not be used to execute statements with
side-effects, and should not be used outside core mm code.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin
2006-09-25 23:30:55 -07:00
committed by Linus Torvalds
parent a6ca1b99ed
commit 725d704eca
5 changed files with 36 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
mm/internal.h
View File

@ -24,8 +24,8 @@ static inline void set_page_count(struct page *page, int v)
*/
static inline void set_page_refcounted(struct page *page)
{
BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
BUG_ON(atomic_read(&page->_count));
VM_BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
VM_BUG_ON(atomic_read(&page->_count));
set_page_count(page, 1);
}