linux-kernel - Re: [PATCH] lib: Kconfig: disable dynamic sanitizers for test builds

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Message-ID: <20231018165556.GA3842315@dev-arch.thelio-3990X>
Date:   Wed, 18 Oct 2023 09:55:56 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Marco Elver <elver@...gle.com>
Cc:     Hamza Mahfooz <hamza.mahfooz@....com>,
        linux-kernel@...r.kernel.org,
        Rodrigo Siqueira <rodrigo.siqueira@....com>,
        Harry Wentland <harry.wentland@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, kasan-dev@...glegroups.com,
        llvm@...ts.linux.dev, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] lib: Kconfig: disable dynamic sanitizers for test builds

On Wed, Oct 18, 2023 at 06:22:14PM +0200, Marco Elver wrote:
> On Wed, 18 Oct 2023 at 17:32, 'Hamza Mahfooz' via kasan-dev
> <kasan-dev@...glegroups.com> wrote:

<snip>

> > diff --git a/lib/Kconfig.kmsan b/lib/Kconfig.kmsan
> > index ef2c8f256c57..eb05c885d3fd 100644
> > --- a/lib/Kconfig.kmsan
> > +++ b/lib/Kconfig.kmsan
> > @@ -13,6 +13,7 @@ config KMSAN
> >         depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER
> >         depends on SLUB && DEBUG_KERNEL && !KASAN && !KCSAN
> >         depends on !PREEMPT_RT
> > +       depends on !COMPILE_TEST
> 
> KMSAN already selects FRAME_WARN of 0 and should not cause you any
> issues during build testing.

Yeah, this particular case is a bug in the AMDGPU dml2 Makefile, where
CONFIG_FRAME_WARN=0 is not respected.

diff --git a/drivers/gpu/drm/amd/display/dc/dml2/Makefile b/drivers/gpu/drm/amd/display/dc/dml2/Makefile
index f35ed8de260d..66431525f2a0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml2/Makefile
@@ -61,7 +61,7 @@ ifneq ($(CONFIG_FRAME_WARN),0)
 frame_warn_flag := -Wframe-larger-than=2048
 endif
 
-CFLAGS_$(AMDDALPATH)/dc/dml2/display_mode_core.o := $(dml2_ccflags) -Wframe-larger-than=2048
+CFLAGS_$(AMDDALPATH)/dc/dml2/display_mode_core.o := $(dml2_ccflags) $(frame_warn_flag)
 CFLAGS_$(AMDDALPATH)/dc/dml2/display_mode_util.o := $(dml2_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml2_wrapper.o := $(dml2_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml2_utils.o := $(dml2_ccflags)

I will try to send that patch soon, unless one of the AMDGPU folks wants
to beat me to it.

Cheers,
Nathan