diff options
author | Hugh Dickins <hugh@veritas.com> | 2005-10-29 21:16:33 -0400 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 00:40:41 -0400 |
commit | deceb6cd17e6dfafe4c4f81b1b4153bc41b2cb70 (patch) | |
tree | 2a722f50e8edef8609a49f65bfcb222e499c44cc /kernel/kfifo.c | |
parent | c34d1b4d165c67b966bca4aba026443d7ff161eb (diff) |
[PATCH] mm: follow_page with inner ptlock
Final step in pushing down common core's page_table_lock. follow_page no
longer wants caller to hold page_table_lock, uses pte_offset_map_lock itself;
and so no page_table_lock is taken in get_user_pages itself.
But get_user_pages (and get_futex_key) do then need follow_page to pin the
page for them: take Daniel's suggestion of bitflags to follow_page.
Need one for WRITE, another for TOUCH (it was the accessed flag before:
vanished along with check_user_page_readable, but surely get_numa_maps is
wrong to mark every page it finds as accessed), another for GET.
And another, ANON to dispose of untouched_anonymous_page: it seems silly for
that to descend a second time, let follow_page observe if there was no page
table and return ZERO_PAGE if so. Fix minor bug in that: check VM_LOCKED -
make_pages_present ought to make readonly anonymous present.
Give get_numa_maps a cond_resched while we're there.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/kfifo.c')
0 files changed, 0 insertions, 0 deletions