linux-kernel - [tip:core/rcu] idr: Apply lockdep-based diagnostics to rcu

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Date:	Wed, 13 Jan 2010 10:29:47 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/rcu] idr: Apply lockdep-based diagnostics to rcu_dereference() uses

Commit-ID:  213cdf3c7de6a6205b69e2d6439cebcbeea709dd
Gitweb:     http://git.kernel.org/tip/213cdf3c7de6a6205b69e2d6439cebcbeea709dd
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Mon, 4 Jan 2010 18:04:11 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 13 Jan 2010 09:06:09 +0100

idr: Apply lockdep-based diagnostics to rcu_dereference() uses

Because idr can be used with any of a number of locks or with
any flavor of RCU, just disable the lockdep-based diagnostics.

If idr needs diagnostics, the check expression will need to be
passed into the relevant idr primitives as an additional
argument.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: Valdis.Kletnieks@...edu
Cc: dhowells@...hat.com
LKML-Reference: <12626570512685-git-send-email->
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 lib/idr.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/idr.c b/lib/idr.c
index 1cac726..4877fce 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -502,7 +502,7 @@ void *idr_find(struct idr *idp, int id)
 	int n;
 	struct idr_layer *p;
 
-	p = rcu_dereference(idp->top);
+	p = rcu_dereference_raw(idp->top);
 	if (!p)
 		return NULL;
 	n = (p->layer+1) * IDR_BITS;
@@ -517,7 +517,7 @@ void *idr_find(struct idr *idp, int id)
 	while (n > 0 && p) {
 		n -= IDR_BITS;
 		BUG_ON(n != p->layer*IDR_BITS);
-		p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]);
+		p = rcu_dereference_raw(p->ary[(id >> n) & IDR_MASK]);
 	}
 	return((void *)p);
 }
@@ -550,7 +550,7 @@ int idr_for_each(struct idr *idp,
 	struct idr_layer **paa = &pa[0];
 
 	n = idp->layers * IDR_BITS;
-	p = rcu_dereference(idp->top);
+	p = rcu_dereference_raw(idp->top);
 	max = 1 << n;
 
 	id = 0;
@@ -558,7 +558,7 @@ int idr_for_each(struct idr *idp,
 		while (n > 0 && p) {
 			n -= IDR_BITS;
 			*paa++ = p;
-			p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]);
+			p = rcu_dereference_raw(p->ary[(id >> n) & IDR_MASK]);
 		}
 
 		if (p) {
--
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