linux-kernel - Re: [PATCH 1/3] drivers: misc: add omap

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Date:	Tue, 19 Oct 2010 22:21:10 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Kevin Hilman <khilman@...prootsystems.com>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
	Greg KH <greg@...ah.com>, Tony Lindgren <tony@...mide.com>,
	Benoit Cousson <b-cousson@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Hari Kanigeri <h-kanigeri2@...com>, Suman Anna <s-anna@...com>,
	Simon Que <sque@...com>,
	"Krishnamoorthy, Balaji T" <balajitk@...com>
Subject: Re: [PATCH 1/3] drivers: misc: add omap_hwspinlock driver

On Tue, Oct 19, 2010 at 6:58 PM, Kevin Hilman
<khilman@...prootsystems.com> wrote:
>> +      * This spin_trylock_irqsave serves two purposes:
>> +
>> +      * 1. Disable local interrupts and preemption, in order to
>> +      *    minimize the period of time in which the hwspinlock
>> +      *    is taken (so caller will not preempted). This is
>> +      *    important in order to minimize the possible polling on
>> +      *    the hardware interconnect by a remote user of this lock.
>> +      *
>> +      * 2. Make this hwspinlock primitive SMP-safe (so we can try to
>> +      *    take it from additional contexts on the local cpu)
>> +      */
>
> 3. Ensures that in_atomic/might_sleep checks catch potential problems
>   with hwspinlock usage (e.g. scheduler checks like 'scheduling while
>   atomic' etc.)

Nice one. Added.

>> +/**
>> + * omap_hwspinlock_unlock() - unlock a specific hwspinlock
>
> minor nit: s/lock_unlock/_unlock/  to match name below

Thanks.
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