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From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: linux-kernel@vger.kernel.org
Subject: spin_unlock_bh() and preempt_check_resched()
Date: Fri, 20 May 2005 17:18:46 +0200	[thread overview]
Message-ID: <20050520151846.GP3690@bouh.labri.fr> (raw)

Hi,

I'm wondering about macros like _spin_unlock_bh(lock):
do { \
        _raw_spin_unlock(lock); \
        preempt_enable(); \
        local_bh_enable(); \
        __release(lock); \
} while (0)

Is there a reason for using preempt_enable() instead of a simple
preempt_enable_no_resched() ?

Since we know bottom halves are disabled, preempt_schedule() will always
return at once (preempt_count!=0), and hence preempt_check_resched() is
useless here...

Regards,
Samuel

             reply	other threads:[~2005-05-20 15:19 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-20 15:18 Samuel Thibault [this message]
2005-05-21 15:50 ` [PATCH] " Samuel Thibault

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