Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-14 17:14:09 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Drivers: hv: vmbus: Replace smp_store_mb() with virt_store_mb()

Browse Source 
Following the recommendation in Documentation/memory-barriers.txt for
virtual machine guests.

Fixes: 8b6a877c060ed ("Drivers: hv: vmbus: Replace the per-CPU channel lists with a global array of channels")
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20220328154457.100872-1-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Andrea Parri (Microsoft) 2022-03-28 17:44:57 +02:00 committed by Wei Liu
parent be5802795c
commit eaa03d3453
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/hv/channel_mgmt.c
View File

@ -380,7 +380,7 @@ void vmbus_channel_map_relid(struct vmbus_channel *channel)
* execute:
*
* (a) In the "normal (i.e., not resuming from hibernation)" path,
* the full barrier in smp_store_mb() guarantees that the store
* the full barrier in virt_store_mb() guarantees that the store
* is propagated to all CPUs before the add_channel_work work
* is queued. In turn, add_channel_work is queued before the
* channel's ring buffer is allocated/initialized and the
@ -392,14 +392,14 @@ void vmbus_channel_map_relid(struct vmbus_channel *channel)
* recv_int_page before retrieving the channel pointer from the
* array of channels.
*
* (b) In the "resuming from hibernation" path, the smp_store_mb()
* (b) In the "resuming from hibernation" path, the virt_store_mb()
* guarantees that the store is propagated to all CPUs before
* the VMBus connection is marked as ready for the resume event
* (cf. check_ready_for_resume_event()). The interrupt handler
* of the VMBus driver and vmbus_chan_sched() can not run before
* vmbus_bus_resume() has completed execution (cf. resume_noirq).
*/
smp_store_mb(
virt_store_mb(
vmbus_connection.channels[channel->offermsg.child_relid],
channel);
}