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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Kees Cook <keescook@chromium.org>
Cc: Joe Perches <joe@perches.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>, Pavel Machek <pavel@ucw.cz>,
	"Gustavo A . R . Silva" <gustavo@embeddedor.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Kan Liang <kan.liang@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Shawn Landden <shawn@git.icu>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Miller <davem@davemloft.net>,
	clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: [PATCH 2/4] compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use
Date: Sat, 12 Oct 2019 00:25:37 +0200	[thread overview]
Message-ID: <CANiq72msyinpJ0TDe=kh0Zp7jnkWBkkGdy7RYzeY_kmgVDS8=w@mail.gmail.com> (raw)
In-Reply-To: <201910101334.7E09211F@keescook>

On Thu, Oct 10, 2019 at 10:37 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Sat, Oct 05, 2019 at 07:17:36PM +0200, Miguel Ojeda wrote:
> > Hi Joe,
> >
> > On Sat, Oct 5, 2019 at 6:46 PM Joe Perches <joe@perches.com> wrote:
> > >
> > > Reserve the pseudo keyword 'fallthrough' for the ability to convert the
> > > various case block /* fallthrough */ style comments to appear to be an
> > > actual reserved word with the same gcc case block missing fallthrough
> > > warning capability.
> > >
> > > All switch/case blocks now must end in one of:
> > >
> > >         break;
> > >         fallthrough;
> > >         goto <label>;
> > >         return [expression];
> > >         continue;
> > >
> > > fallthough is gcc's __attribute__((__fallthrough__)) which was introduced
> > > in gcc version 7..
> >
> > Nits: double period, missing "r" in fallthough.
> >
> > > fallthrough devolves to an empty "do {} while (0)" if the compiler
> > > version (any version less than gcc 7) does not support the attribute.
> >
> > Perhaps add a short note why (empty statement warnings maybe? I don't
> > remember them but it was months ago so maybe it changed).
> >
> > > Signed-off-by: Joe Perches <joe@perches.com>
> > > Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> >
> > Please add Dan's Suggested-by and copy the things I wrote in the
> > commit message when I proposed this:
> >
> >   https://github.com/ojeda/linux/commit/668f011a2706ea555987e263f609a5deba9c7fc4
>
> Perhaps just take this patch directly with Miguel's authorship into the
> series and tweak the __fallthrough to fallthrough in subject and body.

Since I was going to pick it up, I would have signed-off-by anyway, but yeah ;P

Cheers,
Miguel

  reply	other threads:[~2019-10-11 22:25 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-05 16:46 [PATCH 0/4] treewide: Add 'fallthrough' pseudo-keyword Joe Perches
2019-10-05 16:46 ` [PATCH 1/4] net: sctp: Rename fallthrough label to unhandled Joe Perches
2019-10-07 18:08   ` Nick Desaulniers
2019-10-10 20:34   ` Kees Cook
2019-10-11 12:20   ` Neil Horman
2019-10-05 16:46 ` [PATCH 2/4] compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use Joe Perches
2019-10-05 17:17   ` Miguel Ojeda
2019-10-07 18:14     ` Nick Desaulniers
2019-10-07 18:28       ` Joe Perches
2019-10-10 20:37     ` Kees Cook
2019-10-11 22:25       ` Miguel Ojeda [this message]
2019-10-05 16:46 ` [PATCH 3/4] Documentation/process: Add fallthrough pseudo-keyword Joe Perches
2019-10-05 17:47   ` Miguel Ojeda
2019-10-09 21:51     ` Nick Desaulniers
2019-10-05 16:46 ` [PATCH 4/4] scripts/cvt_style.pl: Tool to reformat sources in various ways Joe Perches
2019-10-05 17:31   ` Miguel Ojeda
2019-10-06  6:35     ` Joe Perches
2019-10-10 20:39       ` Kees Cook
2019-10-10 20:48         ` Joe Perches
2019-10-09 22:37   ` Nick Desaulniers
2019-10-11 16:29 ` [PATCH 0/4] treewide: Add 'fallthrough' pseudo-keyword Linus Torvalds
2019-10-11 17:43   ` Joe Perches
2019-10-11 17:46     ` Linus Torvalds
2019-10-12  2:14       ` Joe Perches
2019-10-11 18:01   ` Miguel Ojeda
2019-10-11 22:07     ` Kees Cook
2019-10-11 22:26       ` Miguel Ojeda

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