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mm/slub.c: do not VM_BUG_ON_PAGE() for temporary on-stack pages 

Commit 309381feae ("mm: dump page when hitting a VM_BUG_ON using
VM_BUG_ON_PAGE") added a bunch of VM_BUG_ON_PAGE() calls.

But, most of the ones in the slub code are for _temporary_ 'struct
page's which are declared on the stack and likely have lots of gunk in
them.  Dumping their contents out will just confuse folks looking at
bad_page() output.  Plus, if we try to page_to_pfn() on them or
soemthing, we'll probably oops anyway.

Turn them back in to VM_BUG_ON()s.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Dave Hansen 2014-01-29 14:05:50 -08:00 committed by Linus Torvalds
parent ba3253c78d
commit a0132ac0f2
1 changed files with 6 additions and 6 deletions
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12
mm/slub.c
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@ -1559,7 +1559,7 @@ static inline void *acquire_slab(struct kmem_cache *s,
new.freelist = freelist;
}
VM_BUG_ON_PAGE(new.frozen, &new);
VM_BUG_ON(new.frozen);
new.frozen = 1;
if (!__cmpxchg_double_slab(s, page,
@ -1812,7 +1812,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
set_freepointer(s, freelist, prior);
new.counters = counters;
new.inuse--;
VM_BUG_ON_PAGE(!new.frozen, &new);
VM_BUG_ON(!new.frozen);
} while (!__cmpxchg_double_slab(s, page,
prior, counters,
@ -1840,7 +1840,7 @@ redo:
old.freelist = page->freelist;
old.counters = page->counters;
VM_BUG_ON_PAGE(!old.frozen, &old);
VM_BUG_ON(!old.frozen);
/* Determine target state of the slab */
new.counters = old.counters;
@ -1952,7 +1952,7 @@ static void unfreeze_partials(struct kmem_cache *s,
old.freelist = page->freelist;
old.counters = page->counters;
VM_BUG_ON_PAGE(!old.frozen, &old);
VM_BUG_ON(!old.frozen);
new.counters = old.counters;
new.freelist = old.freelist;
@ -2225,7 +2225,7 @@ static inline void *get_freelist(struct kmem_cache *s, struct page *page)
counters = page->counters;
new.counters = counters;
VM_BUG_ON_PAGE(!new.frozen, &new);
VM_BUG_ON(!new.frozen);
new.inuse = page->objects;
new.frozen = freelist != NULL;
@ -2319,7 +2319,7 @@ load_freelist:
* page is pointing to the page from which the objects are obtained.
* That page must be frozen for per cpu allocations to work.
*/
VM_BUG_ON_PAGE(!c->page->frozen, c->page);
VM_BUG_ON(!c->page->frozen);
c->freelist = get_freepointer(s, freelist);
c->tid = next_tid(c->tid);
local_irq_restore(flags);