David Vrabel d63c8a029e mm: sync vmalloc address space page tables in alloc_vm_area() ...

commit 461ae488ec upstream.

Xen backend drivers (e.g., blkback and netback) would sometimes fail to
map grant pages into the vmalloc address space allocated with
alloc_vm_area().  The GNTTABOP_map_grant_ref would fail because Xen could
not find the page (in the L2 table) containing the PTEs it needed to
update.

(XEN) mm.c:3846:d0 Could not find L1 PTE for address fbb42000

netback and blkback were making the hypercall from a kernel thread where
task->active_mm != &init_mm and alloc_vm_area() was only updating the page
tables for init_mm.  The usual method of deferring the update to the page
tables of other processes (i.e., after taking a fault) doesn't work as a
fault cannot occur during the hypercall.

This would work on some systems depending on what else was using vmalloc.

Fix this by reverting ef691947d8 ("vmalloc: remove vmalloc_sync_all()
from alloc_vm_area()") and add a comment to explain why it's needed.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Keir Fraser <keir.xen@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2011-10-03 11:40:30 -07:00

..

backing-dev.c

mm/backing-dev.c: reset bdi min_ratio in bdi_unregister()

2011-08-04 21:58:39 -07:00

bootmem.c

crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn

2011-03-23 19:47:19 -07:00

bounce.c

…

cleancache.c

mm: cleancache core ops functions and config

2011-05-26 10:01:36 -06:00

compaction.c

mm: compaction: abort compaction if too many pages are isolated and caller is asynchronous V2

2011-06-15 20:04:02 -07:00

debug-pagealloc.c

…

dmapool.c

…

fadvise.c

…

failslab.c

…

filemap_xip.c

mm: Convert i_mmap_lock to a mutex

2011-05-25 08:39:18 -07:00

filemap.c

more conservative S_NOSEC handling

2011-06-03 18:24:58 -04:00

fremap.c

mm: don't access vm_flags as 'int'

2011-05-26 09:20:31 -07:00

highmem.c

…

huge_memory.c

mm: remove khugepaged double thp vmstat update with CONFIG_NUMA=n

2011-06-15 20:03:58 -07:00

hugetlb.c

mm: fix negative commitlimit when gigantic hugepages are allocated

2011-06-15 20:04:01 -07:00

hwpoison-inject.c

Fix common misspellings

2011-03-31 11:26:23 -03:00

init-mm.c

mm: convert mm->cpu_vm_cpumask into cpumask_var_t

2011-05-25 08:39:21 -07:00

internal.h

mm: nommu: sort mm->mmap list properly

2011-05-25 08:39:05 -07:00

Kconfig

mm: cleancache core ops functions and config

2011-05-26 10:01:36 -06:00

Kconfig.debug

mm: debug-pagealloc: fix kconfig dependency warning

2011-03-22 17:44:02 -07:00

kmemcheck.c

…

kmemleak-test.c

…

kmemleak.c

kmemleak: Do not return a pointer to an object that kmemleak did not get

2011-05-19 17:35:28 +01:00

ksm.c

ksm: fix NULL pointer dereference in scan_get_next_rmap_item()

2011-06-15 20:04:02 -07:00

maccess.c

maccess,probe_kernel: Make write/read src const void *

2011-05-25 19:56:23 -04:00

madvise.c

…

Makefile

mm: cleancache core ops functions and config

2011-05-26 10:01:36 -06:00

memblock.c

mm/memblock: properly handle overlaps and fix error path

2011-03-22 17:44:09 -07:00

memcontrol.c

memcg: fix behavior of mem_cgroup_resize_limit()

2011-08-04 21:58:41 -07:00

memory_hotplug.c

mm, hotplug: protect zonelist building with zonelists_mutex

2011-06-22 21:06:48 -07:00

memory-failure.c

mm/memory-failure.c: fix spinlock vs mutex order

2011-06-27 18:00:13 -07:00

memory.c

mm/futex: fix futex writes on archs with SW tracking of dirty & young

2011-08-04 21:58:38 -07:00

mempolicy.c

mm: proc: move show_numa_map() to fs/proc/task_mmu.c

2011-05-25 08:39:34 -07:00

mempool.c

…

migrate.c

migrate: don't account swapcache as shmem

2011-06-16 15:01:24 -07:00

mincore.c

…

mlock.c

mm: don't access vm_flags as 'int'

2011-05-26 09:20:31 -07:00

mm_init.c

…

mmap.c

mm: get rid of the most spurious find_vma_prev() users

2011-06-16 00:35:09 -07:00

mmu_context.c

…

mmu_notifier.c

…

mmzone.c

…

mprotect.c

…

mremap.c

mm: Convert i_mmap_lock to a mutex

2011-05-25 08:39:18 -07:00

msync.c

…

nobootmem.c

memblock/nobootmem: remove unneeded code from alloc_bootmem_node_high()

2011-05-25 08:39:31 -07:00

nommu.c

mm/nommu.c: fix remap_pfn_range()

2011-07-08 21:14:44 -07:00

oom_kill.c

oom: task->mm == NULL doesn't mean the memory was freed

2011-08-04 21:58:42 -07:00

page_alloc.c

mm: page allocator: reconsider zones for allocation after direct reclaim

2011-10-03 11:40:04 -07:00

page_cgroup.c

memcg: fix init_page_cgroup nid with sparsemem

2011-06-15 20:04:01 -07:00

page_io.c

block: kill off REQ_UNPLUG

2011-03-10 08:52:27 +01:00

page_isolation.c

…

page-writeback.c

Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block

2011-03-24 10:16:26 -07:00

pagewalk.c

pagewalk: only split huge pages when necessary

2011-03-22 17:44:04 -07:00

percpu-km.c

…

percpu-vm.c

…

percpu.c

Merge branch 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2011-05-24 11:53:42 -07:00

pgtable-generic.c

…

prio_tree.c

sanitize <linux/prefetch.h> usage

2011-05-20 12:50:29 -07:00

quicklist.c

…

readahead.c

readahead: readahead page allocations are OK to fail

2011-05-25 08:39:25 -07:00

rmap.c

mm/memory-failure.c: fix spinlock vs mutex order

2011-06-27 18:00:13 -07:00

shmem.c

tmpfs: add shmem_read_mapping_page_gfp

2011-06-27 18:00:12 -07:00

slab.c

SLAB: Record actual last user of freed objects.

2011-06-03 19:33:50 +03:00

slob.c

…

slub.c

slub: always align cpu_slab to honor cmpxchg_double requirement

2011-06-03 19:33:49 +03:00

sparse-vmemmap.c

…

sparse.c

Fix common misspellings

2011-03-31 11:26:23 -03:00

swap_state.c

block: remove per-queue plugging

2011-03-10 08:52:07 +01:00

swap.c

mm: batch activate_page() to reduce lock contention

2011-05-25 08:39:37 -07:00

swapfile.c

mm: move shmem prototypes to shmem_fs.h

2011-06-27 18:00:12 -07:00

thrash.c

vmscan: implement swap token priority aging

2011-06-15 20:03:59 -07:00

truncate.c

mm: fix assertion mapping->nrpages == 0 in end_writeback()

2011-06-27 18:00:13 -07:00

util.c

mm: nommu: sort mm->mmap list properly

2011-05-25 08:39:05 -07:00

vmalloc.c

mm: sync vmalloc address space page tables in alloc_vm_area()

2011-10-03 11:40:30 -07:00

vmscan.c

vmscan: fix a livelock in kswapd

2011-07-19 22:09:31 -07:00

vmstat.c

mm, mem-hotplug: update pcp->stat_threshold when memory hotplug occur

2011-05-25 08:39:09 -07:00