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-rw-r--r--mm/page_alloc.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 206920796f5..559336de968 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