linux-kernel - Re: [PATCH RFCv2 2/3] lib/vsprintf.c: make %pD print full path for file

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Message-ID: <CAHp75VfYgEtJeiVp8b10Va54QShyg4DmWeufuB_WGC8C2SE2mQ@mail.gmail.com>
Date:   Tue, 1 Jun 2021 18:36:41 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Justin He <Justin.He@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Johannes Berg <johannes.berg@...el.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH RFCv2 2/3] lib/vsprintf.c: make %pD print full path for file

On Tue, Jun 1, 2021 at 6:32 PM Matthew Wilcox <willy@...radead.org> wrote:
> On Tue, Jun 01, 2021 at 02:42:15PM +0000, Justin He wrote:

...

> Just don't put anything
> in the buffer if the user didn't supply enough space.  As long as you
> get the return value right, they know the string is bad (or they don't
> care if the string is bad)

It might be that I'm out of context here, but printf() functionality
in the kernel (vsprintf() if being precise)  and its users consider
that it should fill buffer up to the end of whatever space is
available.

-- 
With Best Regards,
Andy Shevchenko