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| author |   Hugh Dickins <hugh.dickins@tiscali.co.uk> | 2009-09-21 17:03:26 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:40 -0700 |
| commit | 8e4b9a60718970bbc02dfd3abd0b956ab65af231 (patch) | |
| tree | 4c19152cea19882071a74f92c0cf6a16d5711f41 /mm/hugetlb.c | |
| parent | mm: add get_dump_page (diff) | |
| download | linux-dev-8e4b9a60718970bbc02dfd3abd0b956ab65af231.tar.xz linux-dev-8e4b9a60718970bbc02dfd3abd0b956ab65af231.zip | |
mm: FOLL_DUMP replace FOLL_ANON
The "FOLL_ANON optimization" and its use_zero_page() test have caused
confusion and bugs: why does it test VM_SHARED? for the very good but
unsatisfying reason that VMware crashed without. As we look to maybe
reinstating anonymous use of the ZERO_PAGE, we need to sort this out.
Easily done: it's silly for __get_user_pages() and follow_page() to
be guessing whether it's safe to assume that they're being used for
a coredump (which can take a shortcut snapshot where other uses must
handle a fault) - just tell them with GUP_FLAGS_DUMP and FOLL_DUMP.
get_dump_page() doesn't even want a ZERO_PAGE: an error suits fine.
Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
0 files changed, 0 insertions, 0 deletions