Andrea Arcangeli ef5a22be2c mm: hugetlb: initialize PG_reserved for tail pages of gigantic compound pages ... Commit 11feeb4980 ("kvm: optimize away THP checks in kvm_is_mmio_pfn()") introduced a memory leak when KVM is run on gigantic compound pages. That commit depends on the assumption that PG_reserved is identical for all head and tail pages of a compound page. So that if get_user_pages returns a tail page, we don't need to check the head page in order to know if we deal with a reserved page that requires different refcounting. The assumption that PG_reserved is the same for head and tail pages is certainly correct for THP and regular hugepages, but gigantic hugepages allocated through bootmem don't clear the PG_reserved on the tail pages (the clearing of PG_reserved is done later only if the gigantic hugepage is freed). This patch corrects the gigantic compound page initialization so that we can retain the optimization in 11feeb4980. The cacheline was already modified in order to set PG_tail so this won't affect the boot time of large memory systems. [akpm@linux-foundation.org: tweak comment layout and grammar] Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reported-by: andy123 <ajs124.ajs124@gmail.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Acked-by: Rafael Aquini <aquini@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-10-16 21:35:52 -07:00
..
backing-dev.c	mm/backing-dev.c: check user buffer length before copying data to the related user buffer	2013-09-11 15:58:03 -07:00
balloon_compaction.c
bootmem.c	mm: kill free_all_bootmem_node()	2013-07-03 16:07:39 -07:00
bounce.c	mm/bounce.c: fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored	2013-09-30 14:31:02 -07:00
cleancache.c	mm: cleancache: clean up cleancache_enabled	2013-04-30 17:04:01 -07:00
compaction.c	mm/compaction.c: periodically schedule when freeing pages	2013-09-30 14:31:01 -07:00
debug-pagealloc.c
dmapool.c
fadvise.c	teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long	2013-03-03 22:46:22 -05:00
failslab.c
filemap_xip.c	lift sb_start_write() out of ->write()	2013-04-09 14:12:56 -04:00
filemap.c	mm: cleanup add_to_page_cache_locked()	2013-09-12 15:38:03 -07:00
fremap.c	mm: save soft-dirty bits on file pages	2013-08-13 17:57:48 -07:00
frontswap.c	frontswap: fix incorrect zeroing and allocation size for frontswap_map	2013-06-12 16:29:46 -07:00
highmem.c
huge_memory.c	Merge branch 'akpm' (patches from Andrew Morton)	2013-09-12 15:44:27 -07:00
hugetlb_cgroup.c	cgroup: pass around cgroup_subsys_state instead of cgroup in file methods	2013-08-08 20:11:24 -04:00
hugetlb.c	mm: hugetlb: initialize PG_reserved for tail pages of gigantic compound pages	2013-10-16 21:35:52 -07:00
hwpoison-inject.c	mm/hwpoison: fix the lack of one reference count against poisoned page	2013-09-30 14:31:03 -07:00
init-mm.c
internal.h	mm: vmscan: fix do_try_to_free_pages() livelock	2013-09-11 15:58:01 -07:00
interval_tree.c
Kconfig	powerpc: Fix memory hotplug with sparse vmemmap	2013-10-03 17:21:38 +10:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm: replace strict_strtoul() with kstrtoul()	2013-09-11 15:57:11 -07:00
ksm.c	mm: replace strict_strtoul() with kstrtoul()	2013-09-11 15:57:11 -07:00
list_lru.c	list_lru: dynamically adjust node arrays	2013-09-10 18:56:32 -04:00
maccess.c
madvise.c	mm/hwpoison: fix traversal of hugetlbfs pages to avoid printk flood	2013-09-30 14:31:02 -07:00
Makefile	list: add a new LRU list type	2013-09-10 18:56:30 -04:00
memblock.c	memblock, numa: binary search node id	2013-09-11 15:57:51 -07:00
memcontrol.c	mm, memcg: protect mem_cgroup_read_events for cpu hotplug	2013-10-16 21:35:52 -07:00
memory_hotplug.c	ACPI and power management fixes for 3.12-rc1	2013-09-12 11:22:45 -07:00
memory-failure.c	mm/hwpoison: fix false report on 2nd attempt at page recovery	2013-09-30 14:31:02 -07:00
memory.c	mm: migration: do not lose soft dirty bit if page is in migration state	2013-10-16 21:35:52 -07:00
mempolicy.c	mbind: add BUG_ON(!vma) in new_vma_page()	2013-09-11 15:57:50 -07:00
mempool.c	mm/mempool.c: convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)	2013-09-11 15:58:14 -07:00
migrate.c	mm: migration: do not lose soft dirty bit if page is in migration state	2013-10-16 21:35:52 -07:00
mincore.c
mlock.c	mm/mlock.c: prevent walking off the end of a pagetable in no-pmd configuration	2013-09-30 14:31:02 -07:00
mm_init.c	mm: tune vm_committed_as percpu_counter batching size	2013-07-03 16:07:32 -07:00
mmap.c	mm/mmap: remove unnecessary assignment	2013-09-11 15:58:13 -07:00
mmu_context.c	mm: remove old aio use_mm() comment	2013-05-07 18:38:27 -07:00
mmu_notifier.c	treewide: relase -> release	2013-06-28 14:34:33 +02:00
mmzone.c
mprotect.c	mm: migration: do not lose soft dirty bit if page is in migration state	2013-10-16 21:35:52 -07:00
mremap.c	mm/mremap.c: call pud_free() after fail calling pmd_alloc()	2013-09-11 15:58:03 -07:00
msync.c
nobootmem.c	mm: concentrate modification of totalram_pages into the mm core	2013-07-03 16:07:33 -07:00
nommu.c	mm: remove free_area_cache	2013-07-10 18:11:34 -07:00
oom_kill.c	mm: memcg: do not trap chargers with full callstack on OOM	2013-09-12 15:38:02 -07:00
page_alloc.c	revert "mm/memory-hotplug: fix lowmem count overflow when offline pages"	2013-09-30 14:31:01 -07:00
page_cgroup.c
page_io.c	aio: Kill aio_rw_vect_retry()	2013-07-30 11:53:12 -04:00
page_isolation.c	mm: memory-hotplug: enable memory hotplug to handle hugepage	2013-09-11 15:57:48 -07:00
page-writeback.c	memcg: add per cgroup writeback pages accounting	2013-09-12 15:38:02 -07:00
pagewalk.c	mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas	2013-05-24 16:22:53 -07:00
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c	mm: move pgtable related functions to right place	2013-09-11 15:57:30 -07:00
process_vm_access.c	Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys	2013-03-12 11:05:45 -07:00
quicklist.c
readahead.c	readahead: make context readahead more conservative	2013-09-11 15:57:39 -07:00
rmap.c	thp: account anon transparent huge pages into NR_ANON_PAGES	2013-09-12 15:38:03 -07:00
shmem.c	initmpfs: make rootfs use tmpfs when CONFIG_TMPFS enabled	2013-09-11 15:59:37 -07:00
slab_common.c	slab_common: Do not check for duplicate slab names	2013-09-28 09:47:41 +03:00
slab.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
slab.h	memcg: check that kmem_cache has memcg_params before accessing it	2013-08-28 19:26:38 -07:00
slob.c	mm/sl[aou]b: Move kmallocXXX functions to common code	2013-09-04 20:51:33 +03:00
slub.c	Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2013-09-15 07:15:06 -04:00
sparse-vmemmap.c	sparse-vmemmap: specify vmemmap population range in bytes	2013-04-29 15:54:35 -07:00
sparse.c	mm/sparse: introduce alloc_usemap_and_memmap	2013-09-11 15:58:01 -07:00
swap_state.c	lib/radix-tree.c: make radix_tree_node_alloc() work correctly within interrupt	2013-09-11 15:59:36 -07:00
swap.c	mm: make lru_add_drain_all() selective	2013-09-12 15:38:02 -07:00
swapfile.c	swap: make cluster allocation per-cpu	2013-09-11 15:57:17 -07:00
truncate.c	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
util.c	swap: clean-up #ifdef in page_mapping()	2013-09-11 15:57:31 -07:00
vmalloc.c	mm/vmalloc: use wrapper function get_vm_area_size to caculate size of vm area	2013-09-11 15:58:02 -07:00
vmpressure.c	Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2013-09-03 18:25:03 -07:00
vmscan.c	mm/vmscan.c: don't forget to free shrinker->nr_deferred	2013-10-16 21:35:52 -07:00
vmstat.c	mm: vmscan: fix do_try_to_free_pages() livelock	2013-09-11 15:58:01 -07:00
zbud.c	mm/zbud: fix some trivial typos in comments	2013-09-11 15:57:35 -07:00
zswap.c	mm/zswap: bugfix: memory leak when re-swapon	2013-10-16 21:35:52 -07:00