linux-kernel - Re: [KJ]remove SPIN_LOCK

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Message-ID: <Pine.LNX.4.64.0704101743520.24794@CPE00045a9c397f-CM001225dbafb6>
Date:	Tue, 10 Apr 2007 17:45:07 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Roland Dreier <rdreier@...co.com>
cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Milind Arun Choudhary <milindchoudhary@...il.com>,
	kernel-janitors@...ts.osdl.org, kernelnewbies@...linux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [KJ]remove SPIN_LOCK_UNLOCKED

On Tue, 10 Apr 2007, Roland Dreier wrote:

>  > >but that's where you would use the more explicit
>  > >__RAW_SPIN_LOCK_UNLOCKED, no?  AFAIK, you really can remove the macro
>  > >SPIN_LOCK_UNLOCKED in its entirety.
>  >
>  > I don't remember LDD speaking about __RAW_*. (And other than not
>  > having looked into the code to date, I don't know the difference.)
>
> Don't worry about the __RAW_SPIN_LOCK_UNLOCKED stuff, that's
> obviously not for generic code to use.  The right answer (as I said
> before) is to use DEFINE_SPINLOCK().

that works fine if you're defining a single spinlock, but what do you
do in cases like this:

arch/sparc/lib/atomic32.c:      [0 ... (ATOMIC_HASH_SIZE-1)] = SPIN_LOCK_UNLOCKED

that is, when you're assigning an array of them?  you still need some
kind of generic, unnamed spinlock in those circumstances, no?

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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