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Groups > linux.kernel > #1517789 > unrolled thread
| Started by | Byungchul Park <byungchul.park@lge.com> |
|---|---|
| First post | 2016-11-09 07:40 +0100 |
| Last post | 2016-11-09 07:40 +0100 |
| Articles | 1 — 1 participant |
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[PATCH 1/2] rcu: Remove unnecessary condition in rcu_implicit_dynticks_qs Byungchul Park <byungchul.park@lge.com> - 2016-11-09 07:40 +0100
| From | Byungchul Park <byungchul.park@lge.com> |
|---|---|
| Date | 2016-11-09 07:40 +0100 |
| Subject | [PATCH 1/2] rcu: Remove unnecessary condition in rcu_implicit_dynticks_qs |
| Message-ID | <sBuI9-3HT-3@gated-at.bofh.it> |
Given two conditions like, COND 1. jiffies >= rdp->rsp->gp_start + 2 * jiffies_till_sched_qs COND 2. jiffies >= rdp->rsp->gp_start + jiffies_till_sched_qs A set of jiffies satisfying COND 2 includes another set satisfying COND 1. Thus COND 1 can be removed from a condition, (COND 1 || COND 2). Signed-off-by: Byungchul Park <byungchul.park@lge.com> --- kernel/rcu/tree.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 5d80925..d8e8859 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1220,9 +1220,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, } /* And if it has been a really long time, kick the CPU as well. */ - if (ULONG_CMP_GE(jiffies, - rdp->rsp->gp_start + 2 * jiffies_till_sched_qs) || - ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs)) + if (ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs)) resched_cpu(rdp->cpu); /* Force CPU into scheduler. */ return 0; -- 1.9.1
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