linux-kernel - Re: [patch 03/18] smp: Add generic smpboot facility

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Message-ID: <CAE9FiQWpcD_GAtmnowTpAEW+6hRqxjokHKf4Nb2K92sm=SUGNQ@mail.gmail.com>
Date:	Fri, 20 Apr 2012 13:07:16 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Matt Turner <mattst88@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Mike Frysinger <vapier@...too.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Richard Kuo <rkuo@...eaurora.org>,
	Tony Luck <tony.luck@...el.com>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	David Howells <dhowells@...hat.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Richard Weinberger <richard@....at>, x86@...nel.org
Subject: Re: [patch 03/18] smp: Add generic smpboot facility

On Fri, Apr 20, 2012 at 6:05 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> Start a new file, which will hold SMP and CPU hotplug related generic
> infrastructure.
>
===================================================================
> --- linux-2.6.orig/kernel/cpu.c
> +++ linux-2.6/kernel/cpu.c
> @@ -17,6 +17,8 @@
>  #include <linux/gfp.h>
>  #include <linux/suspend.h>
>
> +#include "smpboot.h"
> +
>  #ifdef CONFIG_SMP
>  /* Serializes the updates to cpu_online_mask, cpu_present_mask */
>  static DEFINE_MUTEX(cpu_add_remove_lock);
> @@ -300,6 +302,11 @@ static int __cpuinit _cpu_up(unsigned in
>                return -EINVAL;
>
>        cpu_hotplug_begin();
> +
> +       ret = smpboot_prepare(cpu);
> +       if (ret)
> +               goto out;
> +
>        ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls);
>        if (ret) {
>                nr_calls--;
> @@ -320,6 +327,7 @@ static int __cpuinit _cpu_up(unsigned in
>  out_notify:
>        if (ret != 0)
>                __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
> +out:
>        cpu_hotplug_done();
>
>        return ret;
> Index: linux-2.6/kernel/smpboot.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6/kernel/smpboot.c
> @@ -0,0 +1,12 @@
> +/*
> + * Common SMP CPU bringup/teardown functions
> + */
> +
> +#include "smpboot.h"
> +
> +/**
> + * smpboot_prepare - generic smpboot preparation
> + */
> +int __cpuinit smpboot_prepare(unsigned int cpu)
> +{
         return 0;
> +}
--
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