linux-kernel - Re: [PATCH 1/2] Allow rwlocks to re-enable interrupts

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Message-Id: <1224665128.15448.4.camel@twins>
Date:	Wed, 22 Oct 2008 10:45:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Petr Tesarik <ptesarik@...e.cz>
Cc:	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	tee@....com, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/2] Allow rwlocks to re-enable interrupts

On Wed, 2008-10-22 at 10:34 +0200, Petr Tesarik wrote:
> c b/kernel/spinlock.c
> index 29ab207..f769d8a 100644
> --- a/kernel/spinlock.c
> +++ b/kernel/spinlock.c
> @@ -121,7 +121,11 @@ unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
>  	local_irq_save(flags);
>  	preempt_disable();
>  	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
> +#ifdef CONFIG_LOCKDEP
>  	LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
> +#else
> +	_raw_read_lock_flags(lock, &flags);
> +#endif
>  	return flags;
>  }

That should be CONFIG_LOCK_STAT.

But aside from that, I really don't like this change, I'd rather you'd
create a LOCK_CONTENDED_FLAGS() that can deal with this.


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