From: Hugh Dickins Date: Tue, 15 Dec 2009 01:58:58 +0000 (-0800) Subject: mm: mlocking in try_to_unmap_one X-Git-Tag: v2.6.33-rc1~226 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53f79acb6ecb648afd63e0f13deba167f1a934df;p=pandora-kernel.git mm: mlocking in try_to_unmap_one There's contorted mlock/munlock handling in try_to_unmap_anon() and try_to_unmap_file(), which we'd prefer not to repeat for KSM swapping. Simplify it by moving it all down into try_to_unmap_one(). One thing is then lost, try_to_munlock()'s distinction between when no vma holds the page mlocked, and when a vma does mlock it, but we could not get mmap_sem to set the page flag. But its only caller takes no interest in that distinction (and is better testing SWAP_MLOCK anyway), so let's keep the code simple and return SWAP_AGAIN for both cases. try_to_unmap_file()'s TTU_MUNLOCK nonlinear handling was particularly amusing: once unravelled, it turns out to have been choosing between two different ways of doing the same nothing. Ah, no, one way was actually returning SWAP_FAIL when it meant to return SWAP_SUCCESS. [kosaki.motohiro@jp.fujitsu.com: comment adding to mlocking in try_to_unmap_one] [akpm@linux-foundation.org: remove test of MLOCK_PAGES] Signed-off-by: Hugh Dickins Cc: Izik Eidus Cc: Andrea Arcangeli Cc: Nick Piggin Cc: Rik van Riel Cc: Lee Schermerhorn Cc: Andi Kleen Cc: KAMEZAWA Hiroyuki Cc: Wu Fengguang Cc: Minchan Kim Signed-off-by: KOSAKI Motohiro Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed