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

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Message-Id: <20140304150217.ac9d364008a3c95cb2a79b34@linux-foundation.org>
Date:	Tue, 4 Mar 2014 15:02:17 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	rostedt@...dmis.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 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))
 #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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