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Subject[tip:core/rcu] idr: Apply lockdep-based diagnostics to rcu_dereference() uses
Commit-ID:  96be753af91fc9d582450a84722f6a6721d218ad
Gitweb: http://git.kernel.org/tip/96be753af91fc9d582450a84722f6a6721d218ad
Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
AuthorDate: Mon, 22 Feb 2010 17:04:55 -0800
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 25 Feb 2010 10:34:51 +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@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1266887105-1528-11-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
lib/idr.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/idr.c b/lib/idr.c
index 0dc7822..2eb1dca 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -504,7 +504,7 @@ 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;
@@ -519,7 +519,7 @@ 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);
}
@@ -552,7 +552,7 @@ 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;
@@ -560,7 +560,7 @@ 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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