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>

diff --git a/lib/idr.c b/lib/idr.c
index 0dc7822..2eb1dca 100644 (file)
--- 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) {