linux-kernel - Re: [PATCH 31/48] uv: Replace __get_cpu

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Message-ID: <20140304184210.11a0b157@gandalf.local.home>
Date:	Tue, 4 Mar 2014 18:42:10 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>,
	akpm@...uxfoundation.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hedi Berriche <hedi@....com>, Mike Travis <travis@....com>,
	Dimitri Sivanich <sivanich@....com>
Subject: Re: [PATCH 31/48] uv: Replace __get_cpu_var

On Tue, 4 Mar 2014 15:02:17 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 14 Feb 2014 14:19:12 -0600 Christoph Lameter <cl@...ux.com> wrote:
> 
> > Use __this_cpu_read instead.
> > 
> > ...
> >
> > --- linux.orig/arch/x86/include/asm/uv/uv_hub.h	2014-02-03 14:16:53.987889372 -0600
> > +++ linux/arch/x86/include/asm/uv/uv_hub.h	2014-02-03 14:16:53.987889372 -0600
> > @@ -618,7 +618,7 @@
> >  };
> >  
> >  DECLARE_PER_CPU(struct uv_cpu_nmi_s, __uv_cpu_nmi);
> > -#define uv_cpu_nmi			(__get_cpu_var(__uv_cpu_nmi))
> > +#define uv_cpu_nmi			__this_cpu_read(_uv_cpu_nmi)
> 
> arch/x86/platform/uv/uv_nmi.c: In function 'uv_check_nmi':
> arch/x86/platform/uv/uv_nmi.c:218: error: '_uv_cpu_nmi' undeclared (first use in this function)
> arch/x86/platform/uv/uv_nmi.c:218: error: (Each undeclared identifier is reported only once
> arch/x86/platform/uv/uv_nmi.c:218: error: for each function it appears in.)
> 
> 
> This?
> 
> --- a/arch/x86/include/asm/uv/uv_hub.h~uv-replace-__get_cpu_var-fix
> +++ a/arch/x86/include/asm/uv/uv_hub.h
> @@ -618,7 +618,7 @@ struct uv_cpu_nmi_s {
>  };
>  
>  DECLARE_PER_CPU(struct uv_cpu_nmi_s, __uv_cpu_nmi);
> -#define uv_cpu_nmi			__this_cpu_read(_uv_cpu_nmi)
> +#define uv_cpu_nmi			(*this_cpu_ptr(&__uv_cpu_nmi))

Looks like an extra "_" was added.

-- Steve

>  #define uv_hub_nmi			(uv_cpu_nmi.hub)
>  #define uv_cpu_nmi_per(cpu)		(per_cpu(__uv_cpu_nmi, cpu))
>  #define uv_hub_nmi_per(cpu)		(uv_cpu_nmi_per(cpu).hub)
> _

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