srcu: Force full grace-period ordering

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If a process invokes synchronize_srcu(), is delayed just the right amount
of time, and thus does not sleep when waiting for the grace period to
complete, there is no ordering between the end of the grace period and
the code following the synchronize_srcu().  Similarly, there can be a
lack of ordering between the end of the SRCU grace period and callback
invocation.

This commit adds the necessary ordering.

Reported-by: Lance Roy <ldr709@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Further smp_mb() adjustment per email with Lance Roy. ]

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This commit is contained in:

Paul E. McKenney 2016-11-28 12:08:49 -08:00

parent f2c4689640

commit d85b62f18d

3 changed files with 20 additions and 14 deletions

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12

include/linux/rcupdate.h

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