linux-kernel - Re: [gcv v3 25/35] powerpc: Replace __get_cpu

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Message-ID: <CAMuHMdW+LLDLofm_TUvdoVc6J_ZDfxT3kRQw9PBLG=NHuowU2A@mail.gmail.com>
Date:	Wed, 28 Aug 2013 23:18:53 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [gcv v3 25/35] powerpc: Replace __get_cpu_var uses

On Wed, Aug 28, 2013 at 9:48 PM, Christoph Lameter <cl@...ux.com> wrote:
> 4. Retrieve the content of a percpu struct
>
>         DEFINE_PER_CPU(struct mystruct, y);
>         struct mystruct x = __get_cpu_var(y);
>
>    Converts to
>
>         memcpy(this_cpu_ptr(&x), y, sizeof(x));

Still not correct. I think it should be

        memcpy(x, this_cpu_ptr(&y), sizeof(x));

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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