rcu: Remove special bit at the bottom of the ->dynticks counter

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Commit b8c17e6664 ("rcu: Maintain special bits at bottom of ->dynticks
counter") reserved a bit at the bottom of the ->dynticks counter to defer
flushing of TLBs, but this facility never has been used.  This commit
therefore removes this capability along with the rcu_eqs_special_set()
function used to trigger it.

Link: https://lore.kernel.org/linux-doc/CALCETrWNPOOdTrFabTDd=H7+wc6xJ9rJceg6OL1S0rTV5pfSsA@mail.gmail.com/
Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: "Joel Fernandes (Google)" <joel@joelfernandes.org>
[ paulmck: Forward-port to v5.13-rc1. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

...

This commit is contained in:

Joel Fernandes (Google) 2021-05-18 19:17:16 -07:00 • committed by Paul E. McKenney

parent dc87740c8a

commit a86baa69c2

2 changed files with 14 additions and 66 deletions

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3

include/linux/rcutiny.h

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77

kernel/rcu/tree.c

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