xfs: introduce CPU hotplug infrastructure

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We need to move to per-cpu state for both deferred inode
inactivation and CIL tracking, but to do that we
need to handle CPUs being removed from the system by the hot-plug
code. Introduce generic XFS infrastructure to handle CPU hotplug
events that is set up at module init time and torn down at module
exit time.

Initially, we only need CPU dead notifications, so we only set
up a callback for these notifications. The infrastructure can be
updated in future for other CPU hotplug state machine notifications
easily if ever needed.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
[djwong: rearrange some macros, fix function prototypes]
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

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Dave Chinner 2021-08-06 11:05:37 -07:00 • committed by Darrick J. Wong

parent 149e53afc8

commit f1653c2e28

2 changed files with 42 additions and 1 deletions

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42

fs/xfs/xfs_super.c

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1

include/linux/cpuhotplug.h

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