linux-kernel - Re: [PATCH 00/10] Remove uninitialized

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Message-ID: <CA+icZUU4Re5g3rRJ=WF3_KiCEc3CUmbH_PibTunuK_E1QskEjQ@mail.gmail.com>
Date:   Thu, 4 Jun 2020 09:26:58 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Joe Perches <joe@...ches.com>,
        Andy Whitcroft <apw@...onical.com>, x86@...nel.org,
        drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
        b43-dev@...ts.infradead.org, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-mm@...ck.org,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 00/10] Remove uninitialized_var() macro

On Thu, Jun 4, 2020 at 5:33 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> On Wed, Jun 03, 2020 at 04:31:53PM -0700, Kees Cook wrote:
> > Using uninitialized_var() is dangerous as it papers over real bugs[1]
> > (or can in the future), and suppresses unrelated compiler warnings
> > (e.g. "unused variable"). If the compiler thinks it is uninitialized,
> > either simply initialize the variable or make compiler changes.
> >
> > As recommended[2] by[3] Linus[4], remove the macro.
> >
> > Most of the 300 uses don't cause any warnings on gcc 9.3.0, so they're in
> > a single treewide commit in this series. A few others needed to actually
> > get cleaned up, and I broke those out into individual patches.
> >
> > -Kees
> >
> > [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
> > [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
> > [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
> > [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
> >
> > Kees Cook (10):
> >   x86/mm/numa: Remove uninitialized_var() usage
> >   drbd: Remove uninitialized_var() usage
> >   b43: Remove uninitialized_var() usage
> >   rtlwifi: rtl8192cu: Remove uninitialized_var() usage
> >   ide: Remove uninitialized_var() usage
> >   clk: st: Remove uninitialized_var() usage
> >   spi: davinci: Remove uninitialized_var() usage
> >   checkpatch: Remove awareness of uninitialized_var() macro
> >   treewide: Remove uninitialized_var() usage
> >   compiler: Remove uninitialized_var() macro
>
> I applied all of these on top of cb8e59cc8720 and ran a variety of
> builds with clang for arm32, arm64, mips, powerpc, s390, and x86_64 [1]
> and only saw one warning pop up (which was about a variable being
> unused, commented on patch 9 about it). No warnings about uninitialized
> variables came up; clang's -Wuninitialized was not impacted by
> 78a5255ffb6a ("Stop the ad-hoc games with -Wno-maybe-initialized") so it
> should have caught anything egregious.
>
> [1]: https://github.com/nathanchance/llvm-kernel-testing
>
> For the series, consider it:
>
> Tested-by: Nathan Chancellor <natechancellor@...il.com> [build]
>

Hi Kees,

I tried with updated version (checkpatch) of your tree and see no
(new) warnings in my build-log.

Feel free to add my...

Tested-by: Sedat Dilek <sedat.dilek@...il.com>

Thanks.

Regards,
- Sedat -