From: Kees Cook <kees@kernel.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nsc@kernel.org>,
Julian Braha <julianbraha@gmail.com>,
"Lorenzo Stoakes (ARM)" <ljs@kernel.org>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
Ricardo Ribalda <ribalda@chromium.org>,
linux-s390@vger.kernel.org
Subject: Re: [PATCH 1/2] kbuild: Move testing of '-mfentry' back to Makefile from Kconfig
Date: Fri, 30 Oct 2026 15:29:58 -0700 [thread overview]
Message-ID: <20261030222934.0fcfa7-kees@kernel.org> (raw)
In-Reply-To: <20261020-kconfig-fix-mfentry-check-v1-1-428258bc0fc0@kernel.org>
On Tue, Oct 20, 2026 at 02:52:18PM -0700, Nathan Chancellor wrote:
> Ricardo reported another issue with moving this check from Kbuild to
> Kconfig, as '-mfentry' is not supported for x86_32 without '-fno-pic',
> which affects GCC builds that are configured with PIE enabled by
> default. arch/x86/Makefile adds '-fno-pic' to KBUILD_CFLAGS, so this
> works properly in Kbuild.
FWIW, Debian's i686-linux-gnu-gcc 16.2.0 hits this too: ARCH=i386
allmodconfig fails at scripts/mod/empty.o with "'-pg' without '-mfentry'
may be unreliable with shrink wrapping" under -Werror. With this patch
on top of Linus's tree, the whole build is clean.
Tested-by: Kees Cook <kees@kernel.org>
--
Kees Cook
next prev parent reply other threads:[~2026-10-30 22:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 21:52 [PATCH 0/2] kbuild: Fallout from moving '-mfentry' check into Kconfig stage Nathan Chancellor
2026-10-20 21:52 ` [PATCH 1/2] kbuild: Move testing of '-mfentry' back to Makefile from Kconfig Nathan Chancellor
2026-10-21 14:44 ` Kees Cook
2026-10-21 18:25 ` Nathan Chancellor
2026-10-30 22:29 ` Kees Cook [this message]
2026-10-20 21:52 ` [PATCH 2/2] scripts/Kconfig.toolchain: Highlight cc-option differences between Kconfig and Kbuild Nathan Chancellor
2026-10-20 23:48 ` [PATCH 0/2] kbuild: Fallout from moving '-mfentry' check into Kconfig stage Ricardo Ribalda
2026-10-21 13:31 ` Lorenzo Stoakes (ARM)
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