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authorLi Zefan <lizf@cn.fujitsu.com>2009-03-31 15:23:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 08:59:13 -0700
commit610a77e04a8d9fe8764dc484e2182fa251ce1cc2 (patch)
treeec55b9b3698321c3e85cd649fa927554027c75d0 /mm/debug-pagealloc.c
parente2f17d9459aeccf4e013e31cbd741d6b1858eec4 (diff)
downloadvexpress-lsk-610a77e04a8d9fe8764dc484e2182fa251ce1cc2.tar.gz
memdup_user(): introduce
I notice there are many places doing copy_from_user() which follows kmalloc(): dst = kmalloc(len, GFP_KERNEL); if (!dst) return -ENOMEM; if (copy_from_user(dst, src, len)) { kfree(dst); return -EFAULT } memdup_user() is a wrapper of the above code. With this new function, we don't have to write 'len' twice, which can lead to typos/mistakes. It also produces smaller code and kernel text. A quick grep shows 250+ places where memdup_user() *may* be used. I'll prepare a patchset to do this conversion. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Americo Wang <xiyou.wangcong@gmail.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/debug-pagealloc.c')
0 files changed, 0 insertions, 0 deletions