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UPSTREAM: rcu: Refactor code a bit in rcu_nocb_do_flush_bypass()

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This consolidates the code a bit and makes it cleaner. Functionally it
is the same.

Reported-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
(cherry picked from commit 3d222a0c0cfef85bad2c9cff5d541836cb81cfbd)

Bug: 258241771
Signed-off-by: Joel Fernandes <joelaf@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4909031
Reviewed-by: Sean Paul <sean@poorly.run>
Reviewed-by: Vineeth Pillai <vineethrp@google.com>
Signed-off-by: Qais Yousef <qyousef@google.com>
Change-Id: I8422c7138edd6a476fc46374beefdf46dd76b8b0
This commit is contained in:
Joel Fernandes (Google) 2022-10-16 16:22:55 +00:00 committed by Todd Kjos
parent 66a832fe38
commit 4957579439
1 changed files with 9 additions and 8 deletions
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17
kernel/rcu/tree_nocb.h
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@ -327,10 +327,11 @@ static void wake_nocb_gp_defer(struct rcu_data *rdp, int waketype,
*
* Note that this function always returns true if rhp is NULL.
*/
static bool rcu_nocb_do_flush_bypass(struct rcu_data *rdp, struct rcu_head *rhp,
static bool rcu_nocb_do_flush_bypass(struct rcu_data *rdp, struct rcu_head *rhp_in,
unsigned long j, bool lazy)
{
struct rcu_cblist rcl;
struct rcu_head *rhp = rhp_in;
WARN_ON_ONCE(!rcu_rdp_is_offloaded(rdp));
rcu_lockdep_assert_cblist_protected(rdp);
@ -345,16 +346,16 @@ static bool rcu_nocb_do_flush_bypass(struct rcu_data *rdp, struct rcu_head *rhp,
/*
* If the new CB requested was a lazy one, queue it onto the main
* ->cblist so we can take advantage of a sooner grade period.
* ->cblist so that we can take advantage of the grace-period that will
* happen regardless. But queue it onto the bypass list first so that
* the lazy CB is ordered with the existing CBs in the bypass list.
*/
if (lazy && rhp) {
rcu_cblist_flush_enqueue(&rcl, &rdp->nocb_bypass, NULL);
rcu_cblist_enqueue(&rcl, rhp);
WRITE_ONCE(rdp->lazy_len, 0);
} else {
rcu_cblist_flush_enqueue(&rcl, &rdp->nocb_bypass, rhp);
WRITE_ONCE(rdp->lazy_len, 0);
rcu_cblist_enqueue(&rdp->nocb_bypass, rhp);
rhp = NULL;
}
rcu_cblist_flush_enqueue(&rcl, &rdp->nocb_bypass, rhp);
WRITE_ONCE(rdp->lazy_len, 0);
rcu_segcblist_insert_pend_cbs(&rdp->cblist, &rcl);
WRITE_ONCE(rdp->nocb_bypass_first, j);