linux-kernel - Re: tracing: Replace __get_cpu_var uses with this_cpu

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Date:	Tue, 6 May 2014 08:35:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: tracing: Replace __get_cpu_var uses with this_cpu_ptr

On Tue, 29 Apr 2014 14:17:40 -0500 (CDT)
Christoph Lameter <cl@...ux.com> wrote:

> Replace uses of &__get_cpu_var for address calculation with this_cpu_ptr.
> 

I pulled this into my 3.16 queue.

-- Steve

> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Signed-off-by: Christoph Lameter <cl@...ux.com>
> 
> Index: linux/include/linux/kprobes.h
> ===================================================================
> --- linux.orig/include/linux/kprobes.h	2014-04-28 13:09:07.228660946 -0500
> +++ linux/include/linux/kprobes.h	2014-04-28 13:09:07.224661022 -0500
> @@ -356,7 +356,7 @@
> 
>  static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
>  {
> -	return (&__get_cpu_var(kprobe_ctlblk));
> +	return this_cpu_ptr(&kprobe_ctlblk);
>  }
> 
>  int register_kprobe(struct kprobe *p);
> Index: linux/kernel/trace/ftrace.c
> ===================================================================
> --- linux.orig/kernel/trace/ftrace.c	2014-04-28 13:09:07.228660946 -0500
> +++ linux/kernel/trace/ftrace.c	2014-04-28 13:09:07.224661022 -0500
> @@ -817,7 +817,7 @@
> 
>  	local_irq_save(flags);
> 
> -	stat = &__get_cpu_var(ftrace_profile_stats);
> +	stat = this_cpu_ptr(&ftrace_profile_stats);
>  	if (!stat->hash || !ftrace_profile_enabled)
>  		goto out;
> 
> @@ -848,7 +848,7 @@
>  	unsigned long flags;
> 
>  	local_irq_save(flags);
> -	stat = &__get_cpu_var(ftrace_profile_stats);
> +	stat = this_cpu_ptr(&ftrace_profile_stats);
>  	if (!stat->hash || !ftrace_profile_enabled)
>  		goto out;
> 
> Index: linux/kernel/trace/trace.c
> ===================================================================
> --- linux.orig/kernel/trace/trace.c	2014-04-28 13:09:07.228660946 -0500
> +++ linux/kernel/trace/trace.c	2014-04-28 13:09:07.228660946 -0500
> @@ -1728,7 +1728,7 @@
>  	 */
>  	barrier();
>  	if (use_stack == 1) {
> -		trace.entries		= &__get_cpu_var(ftrace_stack).calls[0];
> +		trace.entries		= this_cpu_ptr(ftrace_stack.calls);
>  		trace.max_entries	= FTRACE_STACK_MAX_ENTRIES;
> 
>  		if (regs)

--
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