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>

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/idr.c b/lib/idr.c
index 0dc782216d4b..2eb1dca03681 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) {