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The rcu_sync_enter() function is used by updaters to force RCU readers (e.g. percpu-rwsem) to use their slow paths during an update. This is accomplished by setting the ->gp_state of the rcu_sync structure to GP_ENTER. In the case of percpu-rwsem, the readers' slow path waits on a semaphore instead of just incrementing a reader count. Each updater invokes the rcu_sync_exit() function to signal to readers that they may again take their fastpaths. The rcu_sync_exit() function sets the ->gp_state of the rcu_sync structure to GP_EXIT, and if all goes well, after a grace period the ->gp_state reverts back to GP_IDLE. Unfortunately, the rcu_sync_enter() function currently has a comment incorrectly stating that rcu_sync_exit() (by an updater) will re-enable reader "slowpaths". This patch changes the comment to state that this function re-enables reader fastpaths. Signed-off-by: David Vernet <void@manifault.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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.. | ||
Kconfig | ||
Kconfig.debug | ||
Makefile | ||
rcu.h | ||
rcu_segcblist.c | ||
rcu_segcblist.h | ||
rcuscale.c | ||
rcutorture.c | ||
refscale.c | ||
srcutiny.c | ||
srcutree.c | ||
sync.c | ||
tasks.h | ||
tiny.c | ||
tree.c | ||
tree.h | ||
tree_exp.h | ||
tree_nocb.h | ||
tree_plugin.h | ||
tree_stall.h | ||
update.c |