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[PATCH] boot_pageset must not be freed.

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The boot_pageset needs to be preserved for hotplugging and for off line
processors and nodes. Otherwise pointers will point into memory that has
now a different use. /proc/zoneinfo is currently showing strange results
if processors / nodes are not present.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2005-06-22 20:26:07 -07:00 committed by Linus Torvalds
parent a493604400
commit b7c84c6ada
1 changed files with 9 additions and 2 deletions
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11
mm/page_alloc.c
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@ -1742,10 +1742,17 @@ inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
* with interrupts disabled.
*
* Some NUMA counter updates may also be caught by the boot pagesets.
* These will be discarded when bootup is complete.
*
* The boot_pagesets must be kept even after bootup is complete for
* unused processors and/or zones. They do play a role for bootstrapping
* hotplugged processors.
*
* zoneinfo_show() and maybe other functions do
* not check if the processor is online before following the pageset pointer.
* Other parts of the kernel may not check if the zone is available.
*/
static struct per_cpu_pageset
boot_pageset[NR_CPUS] __initdata;
boot_pageset[NR_CPUS];
/*
* Dynamically allocate memory for the