linux-kernel - Re: Usage semantics of atomic

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Message-ID: <478819EA.2080905@redhat.com>
Date:	Fri, 11 Jan 2008 20:37:46 -0500
From:	Chris Snook <csnook@...hat.com>
To:	Vineet Gupta <vineetg76@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Usage semantics of atomic_set ( )

Vineet Gupta wrote:
> I'm trying to implement atomic ops for a CPU which has no inherent
> support for Read-Modify-Write Ops. Instead of using a global spin lock
> which protects all the atomic APIs, I want to use a spin lock per
> instance of atomic_t.

What operations are you using to implement spinlocks?

A few architectures use arrays of spinlocks to implement atomic_t.  I believe 
sparc and parisc are among them.  Assuming your spinlock implementation is sound 
and efficient, the same technique should work for you.

	-- Chris
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