Messages in this thread Patch in this message | | | Date | Thu, 29 Mar 2012 13:37:11 +0800 | From | Lai Jiangshan <> | Subject | [PATCH x86,mm] cleanup: don't corrupt pgt_buf_end when we don't allocated from it |
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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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