[PATCH -rt] scheduling while atomic in fs/file.c

[Daniel Walker]

Quite the smp_processor_id() warnings. The timer was pinned
before, but the spinlock protection is such that the timer
can migrate with out issues. Allowing the timers to 
migrate (although not often) will allow them to
move off busy cpu's , and potentially follow the
work queue that they wake up. 

Signed-Off-By: Daniel Walker <dwalker@xxxxxxxxxx>

Index: linux-2.6.16/fs/file.c
===================================================================
--- linux-2.6.16.orig/fs/file.c
+++ linux-2.6.16/fs/file.c
@@ -137,7 +137,9 @@ static void free_fdtable_rcu(struct rcu_
 		kfree(fdt->fd);
 		kfree(fdt);
 	} else {
-		fddef = &get_cpu_var(fdtable_defer_list);
+
+		fddef = &per_cpu(fdtable_defer_list, raw_smp_processor_id());
+
 		spin_lock(&fddef->lock);
 		fdt->next = fddef->next;
 		fddef->next = fdt;
@@ -149,7 +151,6 @@ static void free_fdtable_rcu(struct rcu_
 		if (!schedule_work(&fddef->wq))
 			mod_timer(&fddef->timer, 5);
 		spin_unlock(&fddef->lock);
-		put_cpu_var(fdtable_defer_list);
 	}
 }
 
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