* [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");
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