linux-kernel - Re: [PATCH 0/2] kbuild: remove gcc's -Wtype-limits

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aUT_yWin_xslnOFh@derry.ads.avm.de>
Date: Fri, 19 Dec 2025 08:33:29 +0100
From: Nicolas Schier <nsc@...nel.org>
To: Vincent Mailhol <mailhol@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Chris Mason <clm@...com>, David Sterba <dsterba@...e.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kbuild@...r.kernel.org, linux-sparse@...r.kernel.org,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
	dri-devel@...ts.freedesktop.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 0/2] kbuild: remove gcc's -Wtype-limits

On Thu, Dec 18, 2025 at 07:50:00PM +0100, Vincent Mailhol wrote:
> I often read on the mailing list people saying "who cares about W=2
> builds anyway?". At least I do. Not that I want to fix all of them,
> but on some occasions, such as new driver submissions, I have often
> found a couple valid diagnostics in the W=2 output.
> 
> That said, the annoying thing is that W=2 is heavily polluted by one
> warning: -Wtype-limits. Try a gcc W=2 build on any file and see the
> results for yourself. I suspect this to be the reason why so few
> people are using W=2.
> 
> This series removes gcc's -Wtype-limits in an attempt to make W=2 more
> useful. Those who do not use W=2 can continue to not use it if they
> want. Those who, like me, use it form time to time will get an
> improved experience from the reduced spam.
> 
> Extra details on statistics, past attempts and -Wtype-limits
> alternatives are given in the first patch description.
> 
> Signed-off-by: Vincent Mailhol <mailhol@...nel.org>
> ---
> Vincent Mailhol (2):
>       kbuild: remove gcc's -Wtype-limits
>       kbuild: cleanup local -Wno-type-limits exceptions
> 
>  drivers/gpu/drm/Makefile | 1 -
>  fs/btrfs/Makefile        | 1 -
>  scripts/Makefile.warn    | 4 +++-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> ---
> base-commit: 3e7f562e20ee87a25e104ef4fce557d39d62fa85
> change-id: 20251205-remove_wtype-limits-c77eb46d09c2
> 
> Best regards,
> -- 
> Vincent Mailhol <mailhol@...nel.org>
> 

Thanks for the effort!  (This allows to revert commit dc7fe518b049
("overflow: Fix -Wtype-limits compilation warnings").)

Reviewed-by: Nicolas Schier <nsc@...nel.org>