Re: [PATCH] lib/Kconfig.debug: disable FRAME_WARN for kasan and kcsan

From: Nathan Chancellor <nathan@kernel.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Alexander Potapenko" <glider@google.com>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	"Hamza Mahfooz" <hamza.mahfooz@amd.com>,
	linux-kernel@vger.kernel.org,
	"Rodrigo Siqueira" <rodrigo.siqueira@amd.com>,
	"Harry Wentland" <harry.wentland@amd.com>,
	"Alex Deucher" <alexander.deucher@amd.com>,
	stable@vger.kernel.org, "Miguel Ojeda" <ojeda@kernel.org>,
	"Alex Gaynor" <alex.gaynor@gmail.com>,
	"Wedson Almeida Filho" <wedsonaf@gmail.com>,
	"Boqun Feng" <boqun.feng@gmail.com>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Nick Terrell" <terrelln@fb.com>,
	"Nick Desaulniers" <ndesaulniers@google.com>,
	"Tom Rix" <trix@redhat.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Masami Hiramatsu" <mhiramat@kernel.org>,
	"Randy Dunlap" <rdunlap@infradead.org>,
	"Kees Cook" <keescook@chromium.org>,
	"Zhaoyang Huang" <zhaoyang.huang@unisoc.com>,
	"Li Hua" <hucool.lihua@huawei.com>, "Rae Moar" <rmoar@google.com>,
	rust-for-linux@vger.kernel.org, bpf@vger.kernel.org,
	llvm@lists.linux.dev
Subject: Re: [PATCH] lib/Kconfig.debug: disable FRAME_WARN for kasan and kcsan
Date: Thu, 19 Oct 2023 08:56:00 -0700	[thread overview]
Message-ID: <20231019155600.GB60597@dev-arch.thelio-3990X> (raw)
In-Reply-To: <22580470-7def-4723-b836-1688db6da038@app.fastmail.com>

On Thu, Oct 19, 2023 at 02:53:01PM +0200, Arnd Bergmann wrote:
> On Thu, Oct 19, 2023, at 12:04, Alexander Potapenko wrote:
> > So the remaining option would be to just increase the frame size every
> > time a new function surpasses the limit.
> 
> That is clearly not an option, though we could try to
> add Kconfig dependencies that avoid the known bad combinations,
> such as annotating the AMD GPU driver as
> 
>       depends on (CC_IS_GCC || CLANG_VERSION >=180000) || !(KASAN || KCSAN)

This would effectively disable the AMDGPU driver for allmodconfig, which
is somewhat unfortunate as it is an easy testing target.

Taking a step back, this is all being done because of a couple of
warnings in the AMDGPU code. If fixing those in the source is too much
effort (I did note [1] that GCC is at the current limit for that file
even with Rodrigo's series applied [2]), couldn't we just take the
existing workaround that this Makefile has for this file and its high
stack usage and just extend it slightly for clang?

diff --git a/drivers/gpu/drm/amd/display/dc/dml2/Makefile b/drivers/gpu/drm/amd/display/dc/dml2/Makefile
index 66431525f2a0..fd49e3526c0d 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml2/Makefile
@@ -58,7 +58,7 @@ endif
 endif
 
 ifneq ($(CONFIG_FRAME_WARN),0)
-frame_warn_flag := -Wframe-larger-than=2048
+frame_warn_flag := -Wframe-larger-than=$(if $(CONFIG_CC_IS_CLANG),3072,2048)
 endif
 
 CFLAGS_$(AMDDALPATH)/dc/dml2/display_mode_core.o := $(dml2_ccflags) $(frame_warn_flag)

That would address the immediate concern of the warning breaking builds
with CONFIG_WERROR=y while not raising the limit for other files in the
kernel (just this one file in AMDGPU) and avoiding disabling the whole
driver. The number could be lower, I think ~2500 bytes is the most usage
I see with Rodrigo's series applied, so maybe 2800 would be a decent
limit? Once there is a fix in the compiler, this expression could be
changed to use clang-min-version or something of that sort.

[1]: https://lore.kernel.org/20231017172231.GA2348194@dev-arch.thelio-3990X/
[2]: https://lore.kernel.org/20231016142031.241912-1-Rodrigo.Siqueira@amd.com/

Cheers,
Nathan
