linux-kernel - Re: [PATCH v2 1/3] lib/vsprintf: Avoid redundant work with 0 size

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Message-ID: <Yfe5Bb3U6Uil7Y6g@smile.fi.intel.com>
Date:   Mon, 31 Jan 2022 12:25:09 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Waiman Long <longman@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, Ira Weiny <ira.weiny@...el.com>,
        Rafael Aquini <aquini@...hat.com>
Subject: Re: [PATCH v2 1/3] lib/vsprintf: Avoid redundant work with 0 size

On Sun, Jan 30, 2022 at 12:49:37PM -0800, David Rientjes wrote:
> On Sat, 29 Jan 2022, Waiman Long wrote:
> 
> > For *scnprintf(), vsnprintf() is always called even if the input size is
> > 0. That is a waste of time, so just return 0 in this case.

Why do you think it's not legit?

-- 
With Best Regards,
Andy Shevchenko