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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/…

…linux/kernel/git/tip/tip

Pull RCU fix from Ingo Molnar.

Fixes a bug introduced in this merge window by commit b1420f1 ("Make
rcu_barrier() less disruptive")

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rcu: Stop rcu_do_batch() from multiplexing the "count" variable
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commit efc9def8c7ab7ac8d44d8afb565247aa2b21cfd5 2 parents 9acc7bd + b41772a
@torvalds authored
Showing with 7 additions and 7 deletions.
  1. +7 −7 kernel/rcutree.c
View
14 kernel/rcutree.c
@@ -1530,7 +1530,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
{
unsigned long flags;
struct rcu_head *next, *list, **tail;
- int bl, count, count_lazy;
+ int bl, count, count_lazy, i;
/* If no callbacks are ready, just return.*/
if (!cpu_has_callbacks_ready_to_invoke(rdp)) {
@@ -1553,9 +1553,9 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
rdp->nxtlist = *rdp->nxttail[RCU_DONE_TAIL];
*rdp->nxttail[RCU_DONE_TAIL] = NULL;
tail = rdp->nxttail[RCU_DONE_TAIL];
- for (count = RCU_NEXT_SIZE - 1; count >= 0; count--)
- if (rdp->nxttail[count] == rdp->nxttail[RCU_DONE_TAIL])
- rdp->nxttail[count] = &rdp->nxtlist;
+ for (i = RCU_NEXT_SIZE - 1; i >= 0; i--)
+ if (rdp->nxttail[i] == rdp->nxttail[RCU_DONE_TAIL])
+ rdp->nxttail[i] = &rdp->nxtlist;
local_irq_restore(flags);
/* Invoke callbacks. */
@@ -1583,9 +1583,9 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
if (list != NULL) {
*tail = rdp->nxtlist;
rdp->nxtlist = list;
- for (count = 0; count < RCU_NEXT_SIZE; count++)
- if (&rdp->nxtlist == rdp->nxttail[count])
- rdp->nxttail[count] = tail;
+ for (i = 0; i < RCU_NEXT_SIZE; i++)
+ if (&rdp->nxtlist == rdp->nxttail[i])
+ rdp->nxttail[i] = tail;
else
break;
}
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