linux-kernel - Re: [PATCH] lib/vsprintf: add _

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Date:   Fri, 3 Sep 2021 09:01:14 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/vsprintf: add __putchar()

On Fri, Sep 03, 2021 at 10:56:07AM -0400, Steven Rostedt wrote:
> On Sun, 29 Aug 2021 16:36:13 +0300
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> 
> > On Fri, Aug 27, 2021 at 10:11:55AM -0700, Yury Norov wrote:
> > > There are 26 occurrences of the code snippet like this in the file :
> > > 	if (buf < end)
> > > 	        *buf = separator;
> > > 	++buf;
> > > 
> > > This patch adds a helper function __putchar() to replace opencoding.
> > > It adds a lot to readability, and also saves 43 bytes of text on x86.  
> > 
> > Last time I tried similar it failed the compilation.
> > 
> > Anyway, while you remove a lot of code I'm not sure it makes the code better
> > to read and understand. Also, we use the same idiom outside of this file.
> > 
> > I would ask Rasmus' opinion on this.
> > 
> 
> I actually like the clean up, although I haven't reviewed the entire patch.

Thanks.
 
> If it is used outside this file, perhaps it should be in a header instead
> and those other locations should be updated accordingly.

I used 'grep "buf < end"' to find spots for cleanup. And except for
lib/vsprintf.c, there is a few random drivers inappropriate for this
cleanup. Andy, can you please share details?

Steve, if you like it, are you OK if I resend this patch? I just found
another spot in lib/vsprintf.c to rework.

Thanks,
Yury