From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: x86@kernel.org, linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Subject: [PATCH x86,mm] cleanup: don't corrupt pgt_buf_end when we don't allocated from it
Date: Thu, 29 Mar 2012 13:37:11 +0800 [thread overview]
Message-ID: <4F73F507.2060501@cn.fujitsu.com> (raw)
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");
reply other threads:[~2012-03-29 5:31 UTC|newest]
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