From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>,
linux-toolchains@vger.kernel.org
Subject: Re: [PATCH v2] minmax: clamp more efficiently by avoiding extra comparison
Date: Mon, 26 Sep 2022 13:00:22 +0300 [thread overview]
Message-ID: <YzF4NrcBkR/p0cD3@smile.fi.intel.com> (raw)
In-Reply-To: <Yy7d5qWpT5Xj2WvN@zx2c4.com>
On Sat, Sep 24, 2022 at 12:37:26PM +0200, Jason A. Donenfeld wrote:
> On Fri, Sep 23, 2022 at 03:54:12PM -0700, Andrew Morton wrote:
> > On Fri, 23 Sep 2022 17:40:01 +0200 "Jason A. Donenfeld" <Jason@zx2c4.com> wrote:
...
> Worth noting, by the way, is that the input validation check already
> caught a bug when 0day test bot choked:
>
> https://lore.kernel.org/linux-hwmon/20220924101151.4168414-1-Jason@zx2c4.com/
Hooray, it was a good idea! :-)
> So, options:
> 1) Keep this patch as-is, because it is useful on modern compilers.
> 2) Add an ifdef on compiler version, so we generate the best code in
> each case.
> 3) Go back to testing twice, but keep the checker macro because it's
> apparently useful.
> 4) Do nothing and discard this series.
>
> Any of those are okay with me. Opinions?
I tend to case 3) (I believe you typo'ed double 2) cases) and apply the rest
as a separate change with all downsides explained (kinda 1) approach).
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-09-26 10:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAHmME9rH47UFp6sXbDU0UZrTosFrDAa+m_FtqMqRFFNzmOzTdA@mail.gmail.com>
[not found] ` <20220923154001.4074849-1-Jason@zx2c4.com>
[not found] ` <20220923155412.b0132fc62eca18817a023cd2@linux-foundation.org>
2022-09-24 10:37 ` [PATCH v2] minmax: clamp more efficiently by avoiding extra comparison Jason A. Donenfeld
2022-09-25 16:29 ` Andrew Morton
2022-09-26 10:00 ` Andy Shevchenko [this message]
2022-09-26 12:23 ` Jason A. Donenfeld
2022-09-26 18:30 ` Kees Cook
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