* [PATCH x86,mm] cleanup: don't corrupt pgt_buf_end when we don't allocated from it
@ 2012-03-29 5:37 Lai Jiangshan
0 siblings, 0 replies; only message in thread
From: Lai Jiangshan @ 2012-03-29 5:37 UTC (permalink / raw)
To: x86, linux-kernel; +Cc: Ingo Molnar
when after_bootmem, alloc_low_page() allow page from get_zeroed_page(),
so we should not corrupt pgt_buf_end.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 436a030..cba66c6 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -317,7 +317,7 @@ void __init cleanup_highmap(void)
static __ref void *alloc_low_page(unsigned long *phys)
{
- unsigned long pfn = pgt_buf_end++;
+ unsigned long pfn;
void *adr;
if (after_bootmem) {
@@ -327,6 +327,7 @@ static __ref void *alloc_low_page(unsigned long *phys)
return adr;
}
+ pfn = pgt_buf_end++;
if (pfn >= pgt_buf_top)
panic("alloc_low_page: ran out of memory");
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2012-03-29 5:31 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-03-29 5:37 [PATCH x86,mm] cleanup: don't corrupt pgt_buf_end when we don't allocated from it Lai Jiangshan
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.