linux-kernel - Re: [PATCH -v3 6/7] kexec jump: __ftrace_enabled

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Message-ID: <20080815124938.GB24663@elte.hu>
Date:	Fri, 15 Aug 2008 14:49:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH -v3 6/7] kexec jump: __ftrace_enabled_save/restore


* Huang Ying <ying.huang@...el.com> wrote:

> +/* Ftrace disable/restore without lock. Some synchronization mechanism
> + * must be used to prevent ftrace_enabled to be changed between
> + * disable/restore. */

use the proper comment style please:

/*
 *
 */

> +static inline int __ftrace_enabled_save(void)
> +{
> +#ifdef CONFIG_FTRACE
> +	int saved_ftrace_enabled = ftrace_enabled;
> +	ftrace_enabled = 0;
> +	return saved_ftrace_enabled;
> +#else
> +	return 0;
> +#endif
> +}
> +
> +static inline void __ftrace_enabled_restore(int enabled)
> +{
> +#ifdef CONFIG_FTRACE
> +	ftrace_enabled = enabled;
> +#endif
> +}

hm, what is this used for?

also, instead of such an ugly inline, why not create a proper 
kernel/trace/* function for this. That would also give it access to all 
the proper locking mechanisms - instead of relying on some extral 
mechanism.

	Ingo
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