From: Toshi Kani Date: Wed, 11 Sep 2013 21:21:49 +0000 (-0700) Subject: mm/hotplug: verify hotplug memory range X-Git-Tag: v3.12-rc1~52^2~218 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27356f54c8c32609ff45b4ed333bb64fb2eef374;p=pandora-kernel.git mm/hotplug: verify hotplug memory range add_memory() and remove_memory() can only handle a memory range aligned with section. There are problems when an unaligned range is added and then deleted as follows: - add_memory() with an unaligned range succeeds, but __add_pages() called from add_memory() adds a whole section of pages even though a given memory range is less than the section size. - remove_memory() to the added unaligned range hits BUG_ON() in __remove_pages(). This patch changes add_memory() and remove_memory() to check if a given memory range is aligned with section at the beginning. As the result, add_memory() fails with -EINVAL when a given range is unaligned, and does not add such memory range. This prevents remove_memory() to be called with an unaligned range as well. Note that remove_memory() has to use BUG_ON() since this function cannot fail. [akpm@linux-foundation.org: avoid printk warnings] Signed-off-by: Toshi Kani Acked-by: KOSAKI Motohiro Reviewed-by: Tang Chen Reviewed-by: Wanpeng Li Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed