Linux-ARM-Kernel Archive on lore.kernel.org
 help / color / Atom feed
From: Kees Cook <keescook@chromium.org>
To: Stephen Boyd <sboyd@kernel.org>
Cc: "linux-samsung-soc@vger.kernel.org"
	<linux-samsung-soc@vger.kernel.org>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Kukjin Kim <kgene@kernel.org>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	linux-clk@vger.kernel.org,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] clk: samsung: s3c2443: Mark expected switch fall-through
Date: Thu, 21 Feb 2019 14:23:18 -0800
Message-ID: <CAGXu5j+_bm+usH+hK9Pz1hAS9qhmndhmt9Ue3T3Kdta3kk1LHg@mail.gmail.com> (raw)
In-Reply-To: <155078541292.77512.12594007340364187685@swboyd.mtv.corp.google.com>

On Thu, Feb 21, 2019 at 1:43 PM Stephen Boyd <sboyd@kernel.org> wrote:
> Ok, thanks for the background. Looks like the perf tool already
> introduced the #define __fallthrough that they use for this purpose.
> Maybe they're hoping that it will be formalized.

Yeah, GCC has an extension for it (but it's not yet part of the C
standard -- though there are open bugs against Clang to support it).
Our adoption of the markings, thanks to Gustavo's work, has rapidly
increased lately too (we started with something like 2400 instances
and we were gaining about as many each cycle as we removed). 5.1,
though, is closing in on _0_ instances. My thinking is that once we're
to the point where we can globally enable -Wimplicit-fallthrough, then
we can depend on the compiler to enforce this (instead continuing to
depend on external tracking in Coverity and the like). It was a bit of
a chicken-and-egg and I was afraid we were going to be left with this
"partial adoption" for a long time. But we're nearly to the point
where I would be happy doing a tree-wide replacement to __fallthrough
(which should be mechanically easy).

-- 
Kees Cook

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190211181544epcas4p1d899221776a647a5bdf21372304bf0d7@epcas4p1.samsung.com>
2019-02-11 18:15 ` Gustavo A. R. Silva
2019-02-12  0:37   ` Chanwoo Choi
2019-02-12  7:40   ` Krzysztof Kozlowski
2019-02-12 18:57     ` Kees Cook
2019-02-16  0:34       ` Stephen Boyd
2019-02-20 22:26         ` Kees Cook
2019-02-21 21:43           ` Stephen Boyd
2019-02-21 22:23             ` Kees Cook [this message]
2019-02-21 21:44   ` Stephen Boyd

Reply instructions:

You may reply publically 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=CAGXu5j+_bm+usH+hK9Pz1hAS9qhmndhmt9Ue3T3Kdta3kk1LHg@mail.gmail.com \
    --to=keescook@chromium.org \
    --cc=cw00.choi@samsung.com \
    --cc=gustavo@embeddedor.com \
    --cc=kgene@kernel.org \
    --cc=krzk@kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-clk@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-samsung-soc@vger.kernel.org \
    --cc=mturquette@baylibre.com \
    --cc=s.nawrocki@samsung.com \
    --cc=sboyd@kernel.org \
    --cc=tomasz.figa@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

Linux-ARM-Kernel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.git

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

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel


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