Commit b7c84c6a authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds

[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 <>
Signed-off-by: default avatarLinus Torvalds <>
parent a4936044
......@@ -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;
* Dynamically allocate memory for the
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