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

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Message-ID: <AANLkTimx8abJzUo-+BGbM6QxGdMF3dO=dbh_UG=FsWMZ@mail.gmail.com>
Date:	Tue, 19 Oct 2010 23:57:33 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Hari Kanigeri <h-kanigeri2@...com>, Suman Anna <s-anna@...com>,
	Benoit Cousson <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, Simon Que <sque@...com>,
	akpm@...ux-foundation.org, linux-omap@...r.kernel.org,
	"Krishnamoorthy, Balaji T" <balajitk@...com>
Subject: Re: [PATCH 1/3] drivers: misc: add omap_hwspinlock driver

On Tue, Oct 19, 2010 at 10:58 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> If a hwspinlock is taken over a long period of time, its other user
>> (with which we try to achieve synchronization) might be polling the
>> OMAP interconnect for too long (trying to take the hwspinlock) and
>> thus preventing it to be used for other transactions.
>
> This sounds exactly like any other spinlock.

The difference is hardware-specific: the hwspinlock device is located
on the OMAP's L4 interconnect where access is slow, wasteful of power,
and spinning on it may prevent other peripherals from interconnecting.
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