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| author | Christoph Lameter <clameter@engr.sgi.com> | 2005-06-22 20:26:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-22 20:42:32 -0700 |
| commit | b7c84c6ada2be942eca6722edb2cfaad412cd5de (patch) | |
| tree | 06cba21e92755bf6b815221d5124ca0f9faf7985 | |
| parent | a4936044001694f033fe4ea94d6034d51a6b465c (diff) | |
| download | lwn-b7c84c6ada2be942eca6722edb2cfaad412cd5de.tar.gz lwn-b7c84c6ada2be942eca6722edb2cfaad412cd5de.zip | |
[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: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | mm/page_alloc.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 206920796f5f..559336de9687 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -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 |