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Date: Wed, 23 Jan 2019 06:21:44 -0700
From: William Kucharski <william.kucharski@...cle.com>
To: Jann Horn <jannh@...gle.com>
Cc: Greg KH <gregkh@...uxfoundation.org>, Kees Cook <keescook@...omium.org>,
kernel list <linux-kernel@...r.kernel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Laura Abbott <labbott@...hat.com>,
Alexander Popov <alex.popov@...ux.com>,
xen-devel <xen-devel@...ts.xenproject.org>,
dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
Network Development <netdev@...r.kernel.org>,
linux-usb@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Linux-MM <linux-mm@...ck.org>, dev@...nvswitch.org,
linux-kbuild@...r.kernel.org,
linux-security-module <linux-security-module@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 1/3] treewide: Lift switch variables out of switches
> On Jan 23, 2019, at 5:09 AM, Jann Horn <jannh@...gle.com> wrote:
>
> AFAICS this only applies to switch statements (because they jump to a
> case and don't execute stuff at the start of the block), not blocks
> after if/while/... .
It bothers me that we are going out of our way to deprecate valid C constructs
in favor of placing the declarations elsewhere.
As current compiler warnings would catch any reference before initialization
usage anyway, it seems like we are letting a compiler warning rather than the
language standard dictate syntax.
Certainly if we want to make it a best practice coding style issue we can, and
then an appropriate note explaining why should be added to
Documentation/process/coding-style.rst.
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