linux-kernel - Re: [git pull] vfs part 2

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Message-ID: <CA+55aFx8EgB8ZV5R+uXLX9+t=C5b=Caon8pYqw09-tNEu9SBTg@mail.gmail.com>
Date:	Sun, 21 Jun 2015 14:16:15 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [git pull] vfs part 2

On Sun, Jun 21, 2015 at 2:12 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> +               if (count > rsize) {
> +                       WARN_ON(1);
> +                       count = rsize;
> +               }

So if we'd actually want to merge it with the warning, I'd prefer writing it as

        if (WARN_ON_ONCE(count > rsize))
              count = size;

because it's smaller and cannot spam your logs. WARN_ON_ONCE() will
only _warn_ once, but it always returns the conditional for the
warning, so the above does the right thing.

            Linus
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