linux-kernel - Re: [PATCH V2 2/3] Allow rwlocks to re-enable interrupts

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Date:	Thu, 27 Nov 2008 16:33:21 +0100
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, Robin Holt <holt@....com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH V2 2/3] Allow rwlocks to re-enable interrupts

On Thu, 2008-10-23 at 18:06 +0200, Petr Tesarik wrote:
> Pass the original flags to rwlock arch-code, so that it can re-enable
> interrupts if implemented for that architecture.
> 
> Initially, make __raw_read_lock_flags and __raw_write_lock_flags
> stubs which just do the same thing as non-flags variants.
> 
> Signed-off-by: Petr Tesarik <ptesarik@...e.cz>

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

> diff --git a/kernel/spinlock.c b/kernel/spinlock.c
> index cf41b87..7c2f5b5 100644
> --- a/kernel/spinlock.c
> +++ b/kernel/spinlock.c
> @@ -121,7 +121,8 @@ 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_);
> -	LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
> +	LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
> +			     _raw_read_lock_flags, &flags);
>  	return flags;
>  }
>  EXPORT_SYMBOL(_read_lock_irqsave);
> @@ -151,7 +152,8 @@ unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
>  	local_irq_save(flags);
>  	preempt_disable();
>  	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
> -	LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
> +	LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
> +			     _raw_write_lock_flags, &flags);
>  	return flags;
>  }
>  EXPORT_SYMBOL(_write_lock_irqsave);
> 
> 
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