From: Robert Love <rml@tech9.net>
To: sridharv@ufl.edu
Cc: linux-kernel@vger.kernel.org
Subject: Re: interrupt - spin lock question
Date: 04 Mar 2002 02:19:09 -0500 [thread overview]
Message-ID: <1015226350.15281.0.camel@phantasy> (raw)
In-Reply-To: <1015223610.3c83153a33024@webmail.health.ufl.edu>
In-Reply-To: <1015219129.3c8303b9e87a7@webmail.health.ufl.edu> <1015219669.868.35.camel@phantasy> <1015223610.3c83153a33024@webmail.health.ufl.edu>
On Mon, 2002-03-04 at 01:33, sridharv@ufl.edu wrote:
> ok things are clear now. so the spin_lock_irq friends are actually for 2
> purposes - preventing racing from interrupts and from SMP. so if SMP is not
> chosen only the local_irq_disable() part works right??
>
> do { local_irq_disable(); spin_lock(lock); } while (0)
Correct. Although, you would want to use spin_lock_irqsave most of the
time, not spin_lock_irq (difference is, the stored flags value is used
to restore interrupts to there previous condition instead of
unconditionally reenable them).
Btw, Go Gators!
Robert Love
next prev parent reply other threads:[~2002-03-04 7:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-04 5:18 sridharv
2002-03-04 5:27 ` Robert Love
2002-03-04 6:33 ` sridharv
2002-03-04 7:19 ` Robert Love [this message]
2002-03-04 6:32 ` Kittur Sameer
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