linux/mm
Hugh Dickins c74df32c72 [PATCH] mm: ptd_alloc take ptlock
Second step in pushing down the page_table_lock.  Remove the temporary
bridging hack from __pud_alloc, __pmd_alloc, __pte_alloc: expect callers not
to hold page_table_lock, whether it's on init_mm or a user mm; take
page_table_lock internally to check if a racing task already allocated.

Convert their callers from common code.  But avoid coming back to change them
again later: instead of moving the spin_lock(&mm->page_table_lock) down,
switch over to new macros pte_alloc_map_lock and pte_unmap_unlock, which
encapsulate the mapping+locking and unlocking+unmapping together, and in the
end may use alternatives to the mm page_table_lock itself.

These callers all hold mmap_sem (some exclusively, some not), so at no level
can a page table be whipped away from beneath them; and pte_alloc uses the
"atomic" pmd_present to test whether it needs to allocate.  It appears that on
all arches we can safely descend without page_table_lock.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:40 -07:00
..
bootmem.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
fadvise.c [PATCH] xip: madvice/fadvice: execute in place 2005-06-24 00:06:42 -07:00
filemap_xip.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
filemap.c [PATCH] mm: page fault handlers tidyup 2005-10-29 21:40:37 -07:00
filemap.h [PATCH] xip: reduce code duplication 2005-06-24 00:06:41 -07:00
fremap.c [PATCH] mm: ptd_alloc take ptlock 2005-10-29 21:40:40 -07:00
highmem.c [PATCH] gfp_t: the rest 2005-10-28 08:16:51 -07:00
hugetlb.c [PATCH] mm: ptd_alloc take ptlock 2005-10-29 21:40:40 -07:00
internal.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Kconfig [PATCH] fix mm/Kconfig spelling 2005-09-17 11:50:01 -07:00
madvise.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
Makefile [PATCH] xip: fs/mm: execute in place 2005-06-24 00:06:41 -07:00
memory.c [PATCH] mm: ptd_alloc take ptlock 2005-10-29 21:40:40 -07:00
mempolicy.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
mempool.c [PATCH] gfp_t: mm/* (easy parts) 2005-10-28 08:16:47 -07:00
mincore.c [PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR 2005-04-19 13:29:20 -07:00
mlock.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mmap.c [PATCH] mm: ia64 use expand_upwards 2005-10-29 21:40:39 -07:00
mprotect.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
mremap.c [PATCH] mm: ptd_alloc take ptlock 2005-10-29 21:40:40 -07:00
msync.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
nommu.c [PATCH] mm: update_hiwaters just in time 2005-10-29 21:40:39 -07:00
oom_kill.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
page_alloc.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
page_io.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
page-writeback.c [PATCH] timer initialization cleanup: DEFINE_TIMER 2005-09-09 14:03:48 -07:00
pdflush.c [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
prio_tree.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
readahead.c [PATCH] readahead: reset cache_hit earlier 2005-09-07 16:57:25 -07:00
rmap.c [PATCH] mm: update_hiwaters just in time 2005-10-29 21:40:39 -07:00
shmem.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
slab.c [PATCH] slab: add additional debugging to detect slabs from the wrong node 2005-10-29 21:40:36 -07:00
sparse.c [PATCH] sparsemem extreme: hotplug preparation 2005-09-05 00:05:38 -07:00
swap_state.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
swap.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
swapfile.c [PATCH] mm: rss = file_rss + anon_rss 2005-10-29 21:40:38 -07:00
thrash.c [PATCH] swaptoken tuning 2005-10-29 21:40:35 -07:00
tiny-shmem.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
truncate.c [PATCH] DocBook: fix some descriptions 2005-05-01 08:59:26 -07:00
vmalloc.c [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
vmscan.c [PATCH] shrink_list(): skip anon pages if not may_swap 2005-10-29 21:40:36 -07:00