| 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
| ||
|
Message-ID: <87jzlohhbc.fsf@intel.com>
Date: Tue, 26 Mar 2024 22:24:55 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Arnd Bergmann <arnd@...nel.org>, linux-kbuild@...r.kernel.org, Masahiro
Yamada <masahiroy@...nel.org>, Harry Wentland <harry.wentland@....com>,
Alex Deucher <alexander.deucher@....com>, Christian König
<christian.koenig@....com>, Lucas De Marchi <lucas.demarchi@...el.com>,
Oded Gabbay <ogabbay@...nel.org>, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Andrew Jeffery
<andrew@...econstruct.com.au>, Linus Walleij <linus.walleij@...aro.org>,
Joel Stanley <joel@....id.au>, Alexei Starovoitov <ast@...nel.org>, Daniel
Borkmann <daniel@...earbox.net>, Andrew Morton
<akpm@...ux-foundation.org>, Nathan Chancellor <nathan@...nel.org>
Cc: Nicolas Schier <nicolas@...sle.eu>, Arnd Bergmann <arnd@...db.de>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, linux-mm@...ck.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 01/12] kbuild: make -Woverride-init warnings more
consistent
On Tue, 26 Mar 2024, Arnd Bergmann <arnd@...nel.org> wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> The -Woverride-init warn about code that may be intentional or not,
> but the inintentional ones tend to be real bugs, so there is a bit of
> disagreement on whether this warning option should be enabled by default
> and we have multiple settings in scripts/Makefile.extrawarn as well as
> individual subsystems.
>
> Older versions of clang only supported -Wno-initializer-overrides with
> the same meaning as gcc's -Woverride-init, though all supported versions
> now work with both. Because of this difference, an earlier cleanup of
> mine accidentally turned the clang warning off for W=1 builds and only
> left it on for W=2, while it's still enabled for gcc with W=1.
>
> There is also one driver that only turns the warning off for newer
> versions of gcc but not other compilers, and some but not all the
> Makefiles still use a cc-disable-warning conditional that is no
> longer needed with supported compilers here.
>
> Address all of the above by removing the special cases for clang
> and always turning the warning off unconditionally where it got
> in the way, using the syntax that is supported by both compilers.
>
> Fixes: 2cd3271b7a31 ("kbuild: avoid duplicate warning options")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> drivers/gpu/drm/amd/display/dc/dce110/Makefile | 2 +-
> drivers/gpu/drm/amd/display/dc/dce112/Makefile | 2 +-
> drivers/gpu/drm/amd/display/dc/dce120/Makefile | 2 +-
> drivers/gpu/drm/amd/display/dc/dce60/Makefile | 2 +-
> drivers/gpu/drm/amd/display/dc/dce80/Makefile | 2 +-
> drivers/gpu/drm/i915/Makefile | 6 +++---
> drivers/gpu/drm/xe/Makefile | 4 ++--
> drivers/net/ethernet/renesas/sh_eth.c | 2 +-
> drivers/pinctrl/aspeed/Makefile | 2 +-
> fs/proc/Makefile | 2 +-
> kernel/bpf/Makefile | 2 +-
> mm/Makefile | 3 +--
> scripts/Makefile.extrawarn | 10 +++-------
> 13 files changed, 18 insertions(+), 23 deletions(-)
>
[snip]
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 3ef6ed41e62b..4c2f85632391 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -33,9 +33,9 @@ endif
> subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
>
> # Fine grained warnings disable
> -CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
> -CFLAGS_display/intel_display_device.o = $(call cc-disable-warning, override-init)
> -CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
> +CFLAGS_i915_pci.o = -Wno-override-init
> +CFLAGS_display/intel_display_device.o = -Wno-override-init
> +CFLAGS_display/intel_fbdev.o = -Wno-override-init
>
> # Support compiling the display code separately for both i915 and xe
> # drivers. Define I915 when building i915.
> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
> index 5a428ca00f10..c29a850859ad 100644
> --- a/drivers/gpu/drm/xe/Makefile
> +++ b/drivers/gpu/drm/xe/Makefile
> @@ -172,8 +172,8 @@ subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
> -Ddrm_i915_gem_object=xe_bo \
> -Ddrm_i915_private=xe_device
>
> -CFLAGS_i915-display/intel_fbdev.o = $(call cc-disable-warning, override-init)
> -CFLAGS_i915-display/intel_display_device.o = $(call cc-disable-warning, override-init)
> +CFLAGS_i915-display/intel_fbdev.o = -Wno-override-init
> +CFLAGS_i915-display/intel_display_device.o = -Wno-override-init
For i915 and xe parts,
Acked-by: Jani Nikula <jani.nikula@...el.com>
> # Rule to build SOC code shared with i915
> $(obj)/i915-soc/%.o: $(srctree)/drivers/gpu/drm/i915/soc/%.c FORCE
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 475e1e8c1d35..0786eb0da391 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -50,7 +50,7 @@
> * the macros available to do this only define GCC 8.
> */
> __diag_push();
> -__diag_ignore(GCC, 8, "-Woverride-init",
> +__diag_ignore_all("-Woverride-init",
> "logic to initialize all and then override some is OK");
This is nice because it's more localized than the per-file
disable. However, we tried to do this in i915, but this doesn't work for
GCC versions < 8, and some defconfigs enabling -Werror forced us to
revert. See commit 290d16104575 ("Revert "drm/i915: use localized
__diag_ignore_all() instead of per file"").
BR,
Jani.
--
Jani Nikula, Intel
Powered by blists - more mailing lists