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David Hildenbrand bc58ebd506 hv_balloon: don't check for memhp_auto_online manually
We get the MEM_ONLINE notifier call if memory is added right from the
kernel via add_memory() or later from user space.

Let's get rid of the "ha_waiting" flag - the wait event has an inbuilt
mechanism (->done) for that.  Initialize the wait event only once and
reinitialize before adding memory.  Unconditionally call complete() and
wait_for_completion_timeout().

If there are no waiters, complete() will only increment ->done - which
will be reset by reinit_completion().  If complete() has already been
called, wait_for_completion_timeout() will not wait.

There is still the chance for a small race between concurrent
reinit_completion() and complete().  If complete() wins, we would not wait
- which is tolerable (and the race exists in current code as well).

Note: We only wait for "some" memory to get onlined, which seems to be
      good enough for now.

[akpm@linux-foundation.org: register_memory_notifier() after init_completion(), per David]
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Yumei Huang <yuhuang@redhat.com>
Link: http://lkml.kernel.org/r/20200317104942.11178-6-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-07 10:43:40 -07:00
..
Kconfig clocksource/drivers/hyperv: Enable TSC page clocksource on 32bit 2019-08-23 16:59:54 +02:00
Makefile drivers: hv: vmbus: Introduce latency testing 2019-11-21 20:10:44 -05:00
channel.c Drivers: hv: vmbus: Fix virt_to_hvpfn() for X86_PAE 2019-08-20 12:49:57 -04:00
channel_mgmt.c Drivers: hv: vmbus: Ignore CHANNELMSG_TL_CONNECT_RESULT(23) 2020-01-25 16:52:11 -05:00
connection.c Drivers: hv: vmbus: Remove dependencies on guest page size 2019-11-21 20:10:45 -05:00
hv.c x86/hyperv: Initialize clockevents earlier in CPU onlining 2019-11-15 10:33:49 +01:00
hv_balloon.c hv_balloon: don't check for memhp_auto_online manually 2020-04-07 10:43:40 -07:00
hv_debugfs.c drivers: hv: vmbus: Introduce latency testing 2019-11-21 20:10:44 -05:00
hv_fcopy.c hv_utils: Add the support of hibernation 2020-01-26 22:10:17 -05:00
hv_kvp.c hv_utils: Add the support of hibernation 2020-01-26 22:10:17 -05:00
hv_snapshot.c hv_utils: Add the support of hibernation 2020-01-26 22:10:17 -05:00
hv_trace.c hv: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_trace.h tools: hv: Use the correct style for SPDX License Identifier 2019-08-17 15:29:34 -04:00
hv_trace_balloon.h hv_balloon: trace post_status 2018-03-06 09:57:17 -08:00
hv_util.c - Most of the commits here are work to enable host-initiated hibernation 2020-02-03 14:42:03 +00:00
hv_utils_transport.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_utils_transport.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hyperv_vmbus.h hv_utils: Add the support of hibernation 2020-01-26 22:10:17 -05:00
ring_buffer.c drivers: hv: vmbus: Introduce latency testing 2019-11-21 20:10:44 -05:00
vmbus_drv.c Drivers: hv: vmbus: Ignore CHANNELMSG_TL_CONNECT_RESULT(23) 2020-01-25 16:52:11 -05:00