LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Nick Desaulniers <ndesaulniers@google.com>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: kernel test robot <lkp@intel.com>,
	Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	kbuild-all@lists.01.org,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Linux Memory Management List <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ubsan: Implement __ubsan_handle_alignment_assumption
Date: Tue, 12 Jan 2021 17:39:57 -0800
Message-ID: <CAKwvOdnx99YTGhP-mH-9E6YTLLUfauuteFtqZSeXLv5Vy+XowA@mail.gmail.com> (raw)
In-Reply-To: <20210113013130.GA3446359@ubuntu-m3-large-x86>

On Tue, Jan 12, 2021 at 5:31 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> On Wed, Jan 13, 2021 at 08:39:52AM +0800, kernel test robot wrote:
> > Hi Nathan,
> >
> > I love your patch! Perhaps something to improve:
> >
> > [auto build test WARNING on 7c53f6b671f4aba70ff15e1b05148b10d58c2837]
> >
> > url:    https://github.com/0day-ci/linux/commits/Nathan-Chancellor/ubsan-Implement-__ubsan_handle_alignment_assumption/20210113-055714
> > base:    7c53f6b671f4aba70ff15e1b05148b10d58c2837
> > config: arm64-randconfig-r031-20210112 (attached as .config)
> > compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 32bcfcda4e28375e5a85268d2acfabcfcc011abf)
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # install arm64 cross compiling tool for clang build
> >         # apt-get install binutils-aarch64-linux-gnu
> >         # https://github.com/0day-ci/linux/commit/775adad26a60878926c0ee6cd460a1375bbe51e6
> >         git remote add linux-review https://github.com/0day-ci/linux
> >         git fetch --no-tags linux-review Nathan-Chancellor/ubsan-Implement-__ubsan_handle_alignment_assumption/20210113-055714
> >         git checkout 775adad26a60878926c0ee6cd460a1375bbe51e6
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> >    lib/ubsan.c:192:6: warning: no previous prototype for function '__ubsan_handle_add_overflow' [-Wmissing-prototypes]
> >    void __ubsan_handle_add_overflow(void *data,
> >         ^
> >    lib/ubsan.c:192:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> >    void __ubsan_handle_add_overflow(void *data,
> >    ^
> >    static
> >    lib/ubsan.c:200:6: warning: no previous prototype for function '__ubsan_handle_sub_overflow' [-Wmissing-prototypes]
> >    void __ubsan_handle_sub_overflow(void *data,
> >         ^
> >    lib/ubsan.c:200:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> >    void __ubsan_handle_sub_overflow(void *data,
> >    ^
>
> Given that these are compiler inserted functions, there is not much of a
> point to having prototypes to them. If people feel shutting these
> warnings up is worthwhile, we can just add the prototypes right above
> the function definition in a follow up patch.

Same as stpcpy; it would be nice though. ;)
-- 
Thanks,
~Nick Desaulniers

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-12 20:55 Nathan Chancellor
2021-01-12 21:15 ` Nick Desaulniers
2021-01-12 21:37   ` Nathan Chancellor
2021-01-12 21:53     ` Nick Desaulniers
2021-01-12 22:06       ` Nathan Chancellor
2021-01-12 23:56         ` Kees Cook
2021-01-13  0:12 ` [PATCH v2] " Nathan Chancellor
2021-01-27 22:44   ` [PATCH v3] " Nathan Chancellor
2021-01-27 22:54     ` Nick Desaulniers
2021-01-13  0:18 ` [PATCH] " kernel test robot
2021-01-13  0:39 ` kernel test robot
2021-01-13  1:31   ` Nathan Chancellor
2021-01-13  1:39     ` Nick Desaulniers [this message]
2021-01-27 22:26       ` Nick Desaulniers

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAKwvOdnx99YTGhP-mH-9E6YTLLUfauuteFtqZSeXLv5Vy+XowA@mail.gmail.com \
    --to=ndesaulniers@google.com \
    --cc=akpm@linux-foundation.org \
    --cc=clang-built-linux@googlegroups.com \
    --cc=kbuild-all@lists.01.org \
    --cc=keescook@chromium.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=lkp@intel.com \
    --cc=natechancellor@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git