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memory hotplug: Refuse to add unaligned memory regions

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The sysfs memory probe interface allows unaligned regions
to be added:

# echo 0xffffff > /sys/devices/system/memory/probe

# cat /proc/iomem
00ffffff-01fffffe : System RAM
01ffffff-02fffffe : System RAM
02ffffff-03fffffe : System RAM
03ffffff-04fffffe : System RAM
04ffffff-05fffffe : System RAM

Return -EINVAL instead of creating these bad regions.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anton Blanchard 2011-09-15 06:26:15 +10:00 committed by Greg Kroah-Hartman
parent 220c1ed1bd
commit 61b94feafa
1 changed files with 4 additions and 0 deletions
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4
drivers/base/memory.c
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@ -380,9 +380,13 @@ memory_probe_store(struct class *class, struct class_attribute *attr,
u64 phys_addr;
int nid;
int i, ret;
unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block;
phys_addr = simple_strtoull(buf, NULL, 0);
if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1))
return -EINVAL;
for (i = 0; i < sections_per_block; i++) {
nid = memory_add_physaddr_to_nid(phys_addr);
ret = add_memory(nid, phys_addr,