netdev - Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks

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Date:	Thu, 28 Feb 2013 19:00:07 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Lai Jiangshan <eag0628@...il.com>, linux-doc@...r.kernel.org,
	peterz@...radead.org, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	mingo@...nel.org, linux-arch@...r.kernel.org,
	linux@....linux.org.uk, xiaoguangrong@...ux.vnet.ibm.com,
	wangyun@...ux.vnet.ibm.com, paulmck@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	rusty@...tcorp.com.au, rostedt@...dmis.org, rjw@...k.pl,
	vincent.guittot@...aro.org, tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	sbw@....edu, tj@...nel.org, akpm@...ux-foundation.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of
	Per-CPU Reader-Writer Locks

On 02/28, Michel Lespinasse wrote:
>
> On Thu, Feb 28, 2013 at 3:25 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> > On 02/27, Michel Lespinasse wrote:
> >>
> >> +void lg_rwlock_local_read_lock(struct lgrwlock *lgrw)
> >> +{
> >> +       preempt_disable();
> >> +
> >> +       if (__this_cpu_read(*lgrw->local_refcnt) ||
> >> +           arch_spin_trylock(this_cpu_ptr(lgrw->lglock->lock))) {
> >> +               __this_cpu_inc(*lgrw->local_refcnt);
> >
> > Please look at __this_cpu_generic_to_op(). You need this_cpu_inc()
> > to avoid the race with irs. The same for _read_unlock.
>
> Hmmm, I was thinking that this was safe because while interrupts might
> modify local_refcnt to acquire a nested read lock, they are expected
> to release that lock as well which would set local_refcnt back to its
> original value ???

Yes, yes, this is correct.

I meant that (in general, x86 is fine) __this_cpu_inc() itself is not
irq-safe. It simply does "pcp += 1".

this_cpu_inc() is fine, _this_cpu_generic_to_op() does cli/sti around.

I know this only because I did the same mistake recently, and Srivatsa
explained the problem to me ;)

Oleg.

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