linux-kernel - Re: [PATCH] trace/ftrace.c: remove redundant swap function

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Message-ID: <87zj03elqt.fsf@rasmusvillemoes.dk>
Date:	Wed, 30 Sep 2015 21:43:38 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace/ftrace.c: remove redundant swap function

On Wed, Sep 09 2015, Rasmus Villemoes <linux@...musvillemoes.dk> wrote:

ping

> To cover the common case of sorting an array of pointers, Daniel
> Wagner recently modified the library sort() to use a specific swap
> function for size==8, in addition to the size==4 case which was
> already handled. Since sizeof(long) is either 4 or 8,
> ftrace_swap_ips() is redundant and we can just let sort() pick an
> appropriate and fast swap callback.
>
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  kernel/trace/ftrace.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index b0623ac785a2..186bafa9935d 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -4783,17 +4783,6 @@ static int ftrace_cmp_ips(const void *a, const void *b)
>  	return 0;
>  }
>  
> -static void ftrace_swap_ips(void *a, void *b, int size)
> -{
> -	unsigned long *ipa = a;
> -	unsigned long *ipb = b;
> -	unsigned long t;
> -
> -	t = *ipa;
> -	*ipa = *ipb;
> -	*ipb = t;
> -}
> -
>  static int ftrace_process_locs(struct module *mod,
>  			       unsigned long *start,
>  			       unsigned long *end)
> @@ -4813,7 +4802,7 @@ static int ftrace_process_locs(struct module *mod,
>  		return 0;
>  
>  	sort(start, count, sizeof(*start),
> -	     ftrace_cmp_ips, ftrace_swap_ips);
> +	     ftrace_cmp_ips, NULL);
>  
>  	start_pg = ftrace_allocate_pages(count);
>  	if (!start_pg)
--
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