Michal Hocko b93e0f329e mm, memory_hotplug: get rid of zonelists_mutex ... zonelists_mutex was introduced by commit 4eaf3f6439 ("mem-hotplug: fix potential race while building zonelist for new populated zone") to protect zonelist building from races. This is no longer needed though because both memory online and offline are fully serialized. New users have grown since then. Notably setup_per_zone_wmarks wants to prevent from races between memory hotplug, khugepaged setup and manual min_free_kbytes update via sysctl (see cfd3da1e49 ("mm: Serialize access to min_free_kbytes"). Let's add a private lock for that purpose. This will not prevent from seeing halfway through memory hotplug operation but that shouldn't be a big deal becuse memory hotplug will update watermarks explicitly so we will eventually get a full picture. The lock just makes sure we won't race when updating watermarks leading to weird results. Also __build_all_zonelists manipulates global data so add a private lock for it as well. This doesn't seem to be necessary today but it is more robust to have a lock there. While we are at it make sure we document that memory online/offline depends on a full serialization either via mem_hotplug_begin() or device_lock. Link: http://lkml.kernel.org/r/20170721143915.14161-9-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Shaohua Li <shaohua.li@intel.com> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Haicheng Li <haicheng.li@linux.intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-09-06 17:27:26 -07:00
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acpi	Device properties framework updates for v4.14-rc1	2017-09-05 12:50:00 -07:00
asm-generic	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-09-04 12:21:28 -07:00
clocksource	…
crypto	…
drm	drm/syncobj: Add a callback mechanism for replace_fence (v3)	2017-08-29 06:26:42 +10:00
dt-bindings	…
keys	…
kvm	…
linux	mm, memory_hotplug: get rid of zonelists_mutex	2017-09-06 17:27:26 -07:00
math-emu	…
media	…
memory	…
misc	…
net	ipv6: fix sparse warning on rt6i_node	2017-08-28 15:34:40 -07:00
pcmcia	…
ras	…
rdma	IB/core: Assign root to all drivers	2017-08-31 08:35:14 -04:00
rxrpc	…
scsi	SCSI fixes on 20170823	2017-08-23 11:34:40 -07:00
soc	…
sound	drm: omapdrm: hdmi: Pass HDMI core version as integer to HDMI audio	2017-08-16 12:52:41 +03:00
target	…
trace	dax: use common 4k zero page for dax mmap reads	2017-09-06 17:27:24 -07:00
uapi	Char/Misc drivers for 4.14-rc1	2017-09-05 11:08:17 -07:00
video	…
xen	…