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Commit b7c84c6a authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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[PATCH] boot_pageset must not be freed. 



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: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a4936044

mm/page_alloc.c

+9 −2
Original line number Diff line number Diff line
@@ -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