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[PATCH] mm: VM_BUG_ON

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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 <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2006-09-25 23:30:55 -07:00 • committed by Linus Torvalds
commit 725d704eca
5 changed files with 36 additions and 29 deletions
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12
mm/swap.c
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@ -233,7 +233,7 @@ void fastcall __page_cache_release(struct page *page)
struct zone *zone = page_zone(page);
spin_lock_irqsave(&zone->lru_lock, flags);
BUG_ON(!PageLRU(page));
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
del_page_from_lru(zone, page);
spin_unlock_irqrestore(&zone->lru_lock, flags);
@ -284,7 +284,7 @@ void release_pages(struct page **pages, int nr, int cold)
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
BUG_ON(!PageLRU(page));
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
del_page_from_lru(zone, page);
}
@ -337,7 +337,7 @@ void __pagevec_release_nonlru(struct pagevec *pvec)
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
if (put_page_testzero(page))
pagevec_add(&pages_to_free, page);
}
@ -364,7 +364,7 @@ void __pagevec_lru_add(struct pagevec *pvec)
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
add_page_to_inactive_list(zone, page);
}
@ -391,9 +391,9 @@ void __pagevec_lru_add_active(struct pagevec *pvec)
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
BUG_ON(PageActive(page));
VM_BUG_ON(PageActive(page));
SetPageActive(page);
add_page_to_active_list(zone, page);
}