linux-kernel - Re: x86: mis-named percpu_xchg

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Message-ID: <alpine.DEB.2.00.1102071115070.3911@router.home>
Date:	Mon, 7 Feb 2011 11:17:25 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Jan Beulich <JBeulich@...ell.com>
cc:	tj@...nel.org, mingo@...e.hu, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: x86: mis-named percpu_xchg_op() after switch to cmpxchg?

On Mon, 7 Feb 2011, Jan Beulich wrote:

> Other than its name implies, with the switch to use cmpxchg instead of
> xchg (commit 8270137a0d50507a5b40f880db636527045b8466) this
> macro is no longer suitable for accessing anything that may be written
> by other than the local CPU (i.e. anything but the various this_cpu
> accessors). Shouldn't it therefore get renamed to eg this_cpu_xchg_op()?

No. The intend of the percpu_xchg_op was also to provide local cpu only
semantics. percpu_xx operations in general have the same semantics as
this_cpu operations.

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