rcu-tasks: Simplify trc_read_check_handler() atomic operations

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Currently, trc_wait_for_one_reader() atomically increments
the trc_n_readers_need_end counter before sending the IPI
invoking trc_read_check_handler().  All failure paths out of
trc_read_check_handler() and also from the smp_call_function_single()
within trc_wait_for_one_reader() must carefully atomically decrement
this counter.  This is more complex than it needs to be.

This commit therefore simplifies things and saves a few lines of
code by dispensing with the atomic decrements in favor of having
trc_read_check_handler() do the atomic increment only in the success case.
In theory, this represents no change in functionality.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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This commit is contained in:

Paul E. McKenney 2021-07-28 10:53:41 -07:00

parent cbe0d8d914

commit 96017bf903

1 changed files with 3 additions and 17 deletions

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kernel/rcu/tasks.h

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