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Tejun Heo 5a17f543ed cgroup: improve css_from_dir() into css_tryget_from_dir() 
css_from_dir() returns the matching css (cgroup_subsys_state) given a
dentry and subsystem.  The function doesn't pin the css before
returning and requires the caller to be holding RCU read lock or
cgroup_mutex and handling pinning on the caller side.

Given that users of the function are likely to want to pin the
returned css (both existing users do) and that getting and putting
css's are very cheap, there's no reason for the interface to be tricky
like this.

Rename css_from_dir() to css_tryget_from_dir() and make it try to pin
the found css and return it only if pinning succeeded.  The callers
are updated so that they no longer do RCU locking and pinning around
the function and just use the returned css.

This will also ease converting cgroup to kernfs.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
2014-02-11 11:52:47 -05:00
..
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
mm: print more details for bad_page()
2014-01-23 16:36:50 -08:00
bootmem.c
mm/bootmem.c: remove unused local `map'
2013-11-13 12:09:09 +09:00
bounce.c
block: Convert bio_for_each_segment() to bvec_iter
2013-11-23 22:33:49 -08:00
cleancache.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
compaction.c
mm: improve documentation of page_order
2014-01-23 16:36:53 -08:00
debug-pagealloc.c
…
dmapool.c
dmapool: make DMAPOOL_DEBUG detect corruption of free marker
2012-12-11 17:22:24 -08:00
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
switch debugfs to umode_t
2012-01-03 22:54:56 -05:00
filemap_xip.c
seqcount: Add lockdep functionality to seqcount/seqlock structures
2013-11-06 12:40:26 +01:00
filemap.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-01-28 08:38:04 -08:00
fremap.c
mm: fix use-after-free in sys_remap_file_pages
2014-01-02 14:40:30 -08:00
frontswap.c
frontswap: fix incorrect zeroing and allocation size for frontswap_map
2013-06-12 16:29:46 -07:00
highmem.c
Some nice cleanups, and even a patch my wife did as a "live" demo for
2012-12-20 08:37:05 -08:00
huge_memory.c
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2014-01-27 21:03:39 -08:00
hugetlb_cgroup.c
cgroup: clean up cgroup_subsys names and initialization
2014-02-08 10:36:58 -05:00
hugetlb.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
hwpoison-inject.c
mm/hwpoison: add '#' to hwpoison_inject
2014-01-21 16:19:48 -08:00
init-mm.c
…
internal.h
mm/page-writeback.c: do not count anon pages as dirtyable memory
2014-01-29 16:22:39 -08:00
interval_tree.c
mm: add CONFIG_DEBUG_VM_RB build option
2012-10-09 16:22:42 +09:00
Kconfig
zsmalloc: move it under mm
2014-01-30 16:56:55 -08:00
Kconfig.debug
mm: more intensive memory corruption debugging
2012-01-10 16:30:42 -08:00
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c
mm: kmemleak: avoid false negatives on vmalloc'ed objects
2013-11-13 12:09:07 +09:00
ksm.c
mm: audit/fix non-modular users of module_init in core code
2014-01-23 16:36:52 -08:00
list_lru.c
mm: list_lru: fix almost infinite loop causing effective livelock
2013-10-30 12:57:46 -07:00
maccess.c
…
madvise.c
mm/hwpoison: fix traversal of hugetlbfs pages to avoid printk flood
2013-09-30 14:31:02 -07:00
Makefile
zsmalloc: move it under mm
2014-01-30 16:56:55 -08:00
memblock.c
memblock: add limit checking to memblock_virt_alloc
2014-01-29 16:22:40 -08:00
memcontrol.c
cgroup: improve css_from_dir() into css_tryget_from_dir()
2014-02-11 11:52:47 -05:00
memory_hotplug.c
mm/memory_hotplug.c: move register_memory_resource out of the lock_memory_hotplug
2014-01-23 16:36:52 -08:00
memory-failure.c
mm/memory-failure.c: shift page lock from head page to tail page after thp split
2014-01-23 16:36:52 -08:00
memory.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
mempolicy.c
mm/mempolicy.c: fix mempolicy printing in numa_maps
2014-01-30 16:56:56 -08:00
mempool.c
mm/mempool.c: convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)
2013-09-11 15:58:14 -07:00
migrate.c
mm/migrate.c: fix setting of cpupid on page migration twice against normal page
2014-01-27 21:02:40 -08:00
mincore.c
mm: do_mincore() cleanup
2014-01-23 16:36:52 -08:00
mlock.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
mm_init.c
mm: bring back /sys/kernel/mm
2014-01-27 21:02:39 -08:00
mmap.c
mm: ignore VM_SOFTDIRTY on VMA merging
2014-01-23 16:36:53 -08:00
mmu_context.c
mm: remove old aio use_mm() comment
2013-05-07 18:38:27 -07:00
mmu_notifier.c
mm: audit/fix non-modular users of module_init in core code
2014-01-23 16:36:52 -08:00
mmzone.c
mm: numa: Change page last {nid,pid} into {cpu,pid}
2013-10-09 14:47:45 +02:00
mprotect.c
mm: numa: do not automatically migrate KSM pages
2014-01-21 16:19:48 -08:00
mremap.c
mm: revert mremap pud_free anti-fix
2013-10-16 21:35:53 -07:00
msync.c
…
nobootmem.c
mm/nobootmem: free_all_bootmem again
2014-01-23 16:36:52 -08:00
nommu.c
mm: add overcommit_kbytes sysctl variable
2014-01-21 16:19:44 -08:00
oom_kill.c
mm, oom: base root bonus on current usage
2014-01-30 16:56:56 -08:00
page_alloc.c
mm: show message when updating min_free_kbytes in thp
2014-01-23 16:36:52 -08:00
page_cgroup.c
Merge branch 'akpm' (incoming from Andrew)
2014-01-21 19:05:45 -08:00
page_io.c
Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block
2014-01-30 11:19:05 -08:00
page_isolation.c
mm: memory-hotplug: enable memory hotplug to handle hugepage
2013-09-11 15:57:48 -07:00
page-writeback.c
mm/page-writeback.c: do not count anon pages as dirtyable memory
2014-01-29 16:22:39 -08:00
pagewalk.c
mm/pagewalk.c: fix walk_page_range() access of wrong PTEs
2013-10-30 14:27:03 -07:00
percpu-km.c
…
percpu-vm.c
mm: fix kernel-doc warnings
2012-06-20 14:39:36 -07:00
percpu.c
Merge branch 'akpm' (incoming from Andrew)
2014-01-21 19:05:45 -08:00
pgtable-generic.c
mm: fix TLB flush race between migration, and change_protection_range
2013-12-18 19:04:51 -08:00
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
mm/readahead.c: fix do_readahead() for no readpage(s)
2014-01-29 16:22:40 -08:00
rmap.c
mm/rmap: fix coccinelle warnings
2014-01-23 16:36:53 -08:00
shmem.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-01-28 08:38:04 -08:00
slab_common.c
slab: fix wrong retval on kmem_cache_create_memcg error path
2014-01-29 16:22:40 -08:00
slab.c
mm: Fix warning on make htmldocs caused by slab.c
2014-01-31 13:52:25 +02:00
slab.h
memcg, slab: RCU protect memcg_params for root caches
2014-01-23 16:36:51 -08:00
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
2014-02-02 11:30:08 -08:00
sparse-vmemmap.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
sparse.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
swap_state.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
swap.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
swapfile.c
mm/swapfile.c: do not skip lowest_bit in scan_swap_map() scan loop
2014-01-23 16:36:53 -08:00
truncate.c
truncate: drop 'oldsize' truncate_pagecache() parameter
2013-09-12 15:38:02 -07:00
util.c
mm: add overcommit_kbytes sysctl variable
2014-01-21 16:19:44 -08:00
vmalloc.c
Revert "mm/vmalloc: interchage the implementation of vmalloc_to_{pfn,page}"
2014-01-27 21:02:39 -08:00
vmpressure.c
arm, pm, vmpressure: add missing slab.h includes
2014-02-03 13:24:01 -05:00
vmscan.c
mm/page-writeback.c: do not count anon pages as dirtyable memory
2014-01-29 16:22:39 -08:00
vmstat.c
mm: numa: return the number of base pages altered by protection changes
2013-11-13 12:09:11 +09:00
zbud.c
mm/zbud: fix some trivial typos in comments
2013-09-11 15:57:35 -07:00
zsmalloc.c
zsmalloc: add copyright
2014-01-30 16:56:55 -08:00
zswap.c
mm/zswap.c: change params from hidden to ro
2014-01-23 16:36:50 -08:00