Re: [PATCH] rcu_process_callbacks: don't cli() while testing ->nxtlist

On Sat, Jan 28, 2006 at 10:02:01PM +0300, Oleg Nesterov wrote:
> __rcu_process_callbacks() disables interrupts to protect itself
> from call_rcu() which adds new entries to ->nxtlist.
> 
> However we can check "->nxtlist != NULL" with interrupts enabled,
> we can't get "false positives" because call_rcu() can only change
> this condition from 0 to 1.
> 
> Tested with rcutorture.ko.
> 
> Signed-off-by: Oleg Nesterov <[email protected]>

Looks good to me.

Thanks
Dipankar
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References:
- [PATCH] rcu_process_callbacks: don't cli() while testing ->nxtlist
  - From: Oleg Nesterov <[email protected]>

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