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Preempt-RCU: Use softirq instead of tasklets for

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This patch makes RCU use softirq instead of tasklets.

It also adds a memory barrier after raising the softirq
inorder to ensure that the cpu sees the most recently updated
value of rcu->cur while processing callbacks.
The discussion of the related theoretical race pointed out
by James Huang can be found here --> http://lkml.org/lkml/2007/11/20/603

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Reviewed-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dipankar Sarma
2008-01-25 21:08:23 +01:00
committed by Ingo Molnar
parent c49443c538
commit c2d727aa2f
2 changed files with 18 additions and 8 deletions
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1
include/linux/interrupt.h
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@@ -256,6 +256,7 @@ enum
#ifdef CONFIG_HIGH_RES_TIMERS
HRTIMER_SOFTIRQ,
#endif
RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
};
/* softirq mask and active fields moved to irq_cpustat_t in