linux-kernel - [PATCH 1/4 V2] rcu: fix srcu_readers

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Message-Id: <1332144734-9375-2-git-send-email-laijs@cn.fujitsu.com>
Date:	Mon, 19 Mar 2012 16:12:11 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: [PATCH 1/4 V2] rcu: fix srcu_readers_active()

After patch "implement Peter's checking algorithm" applied,
SRCU_REF_MASK is not existed.

Also remove unused @cpu in srcu_readers_active_idx_check().

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/srcu.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/kernel/srcu.c b/kernel/srcu.c
index 1bed654..9e86ed7 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -108,7 +108,6 @@ static unsigned long srcu_readers_active_idx(struct srcu_struct *sp, int idx)
 
 static bool srcu_readers_active_idx_check(struct srcu_struct *sp, int idx)
 {
-	int cpu;
 	unsigned long seq;
 
 	seq = srcu_readers_seq_idx(sp, idx);
@@ -186,7 +185,7 @@ static int srcu_readers_active(struct srcu_struct *sp)
 		sum += ACCESS_ONCE(per_cpu_ptr(sp->per_cpu_ref, cpu)->c[0]);
 		sum += ACCESS_ONCE(per_cpu_ptr(sp->per_cpu_ref, cpu)->c[1]);
 	}
-	return sum & SRCU_REF_MASK;
+	return sum;
 }
 
 /**
-- 
1.7.4.4

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