From nobody Fri Dec 19 17:34:24 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8DE7628640D for ; Tue, 6 May 2025 17:10:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746551411; cv=none; b=ZdJlqOfw7fKQIhgp2PtVVrwOaFjCwcAemN1w3Jd2plYU+WRmePuWttZGJBlOTdQwrmsoVAZm70P9lrtOTI8y8eSpgWfrJOYbVsH/VUFx3iTrKNkPPqW6beyqk/RYd2CiYOkOIRWWt0/Fs92unsjyv/x4Q27TJ82W34VhwGQM4IE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746551411; c=relaxed/simple; bh=YPD/+qM/EjqNwh7YB/Dd1xYf0Qv3JjSHbtK9dZaN9Bg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=btz5XfWHYJgN17CG83dLDkF7BLigb1b5AF5oZNc9GE414OZ0Kpt2zETOr+nRPeOWbH0yOSL5JFCxFS7hG70bvLi0yMg/2vD2H+o9eYOddi7ISeMwqCxOsujhvEqLSYdJyny5E/nKdiArhS6nbgxPv+rJLck1DpbAN3gSVvVA4HM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MvHqyyI8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MvHqyyI8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 146D6C4CEEB; Tue, 6 May 2025 17:10:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746551411; bh=YPD/+qM/EjqNwh7YB/Dd1xYf0Qv3JjSHbtK9dZaN9Bg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MvHqyyI8Gwq6dFq7WjLsRBk2mJyfKKPyldnQsouxPQkQeaYQxR1/nrJ/SoUyZNoeD NPtMZpTH3HL9MfS2AWs4/bFsbllXjCt7wDzm026xqV6CDyzfd7vTRiEF/6M34qLmnO wQjzQEU6codvTUHMcduSKir3UWy8G8Q7mPlYn5JobD4dPwXMb6wbusr8c+98EdWtca 7fGLKqCqRPUP0OcMAsuvNXTHyoFo7QmdohkjclUWWZ1FMOt60bt0L/vy2HxjtWCJQo QqrTChUwvnDO1OMl75jRXEb6sVGfdP59eY0hb+6C5f4vBGHdghDAaRSJs4BGzLl1RH 962Mr3clCgDNQ== From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: "H . Peter Anvin" , Linus Torvalds , Peter Zijlstra , Borislav Petkov , Thomas Gleixner , Vitaly Kuznetsov , Ingo Molnar , Ard Biesheuvel , Arnd Bergmann , David Woodhouse , Ivan Shapovalov , Masahiro Yamada , Michal Marek Subject: [PATCH 12/15] x86/kconfig/64: Enable popular kernel debugging options in the defconfig Date: Tue, 6 May 2025 19:09:21 +0200 Message-ID: <20250506170924.3513161-13-mingo@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250506170924.3513161-1-mingo@kernel.org> References: <20250506170924.3513161-1-mingo@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Since the x86 defconfig aims to be a distro kernel work-alike with fewer drivers and a shorter build time, enable a handful of kernel debugging options that are typically enabled on major Linux distributions. The options enabled is a superset of the latest Ubuntu and Fedora kernel debugging configs, using Ubuntu's config-6.11.0-24-generic file, Fedora's kernel-x86_64-fedora.config and RHEL's kernel-x86_64-rhel.config from kernel-ark.git. Notable features enabled: - CONFIG_UBSAN=3Dy: Despite the runtime overhead, UBSAN is actively enabled in all 3 major Linux distros I checked, so we want it enabled in the defconfig as well - to better see the consequences. - CONFIG_DEBUG_SHIRQ=3Dy: Fedora/RHEL have this enabled, while Ubuntu has it disabled. - CONFIG_LIST_HARDENED=3Dy: Fedora/RHEL have CONFIG_DEBUG_LIST enabled, while Ubuntu has it disabled, so pick the lightweight LIST_HARDENED variant. - CONFIG_FUNCTION_PROFILER=3Dy: This is enabled on all distros I checked as well. DEBUGINFO is still disabled, despite enabled in all Linux distros, because the ~10x .o bloat is still just so painful on anything but the most powerful build boxes. Note that while the following features seemingly get removed from the defconfig : - CONFIG_BLK_DEV_INITRD=3Dy - CONFIG_KPROBES=3Dy - CONFIG_MAGIC_SYSRQ=3Dy they are actually still enabled in the actual .config, because they get selected by other options indirectly. Signed-off-by: Ingo Molnar Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: David Woodhouse Cc: H. Peter Anvin Cc: Ivan Shapovalov Cc: Linus Torvalds Cc: Masahiro Yamada Cc: Michal Marek --- arch/x86/configs/defconfig.x86_64 | 46 +++++++++++++++++++++++++++++++++++= +--- 1 file changed, 43 insertions(+), 3 deletions(-) diff --git a/arch/x86/configs/defconfig.x86_64 b/arch/x86/configs/defconfig= .x86_64 index 02c4ba79946b..3c4a03633328 100644 --- a/arch/x86/configs/defconfig.x86_64 +++ b/arch/x86/configs/defconfig.x86_64 @@ -31,7 +31,6 @@ CONFIG_CGROUP_PERF=3Dy CONFIG_CGROUP_BPF=3Dy CONFIG_CGROUP_MISC=3Dy CONFIG_CGROUP_DEBUG=3Dy -CONFIG_BLK_DEV_INITRD=3Dy CONFIG_KALLSYMS_ALL=3Dy CONFIG_PROFILING=3Dy CONFIG_KEXEC=3Dy @@ -68,7 +67,6 @@ CONFIG_KVM_INTEL=3Dy CONFIG_KVM_AMD=3Dy CONFIG_KVM_XEN=3Dy CONFIG_KVM_MAX_NR_VCPUS=3D4096 -CONFIG_KPROBES=3Dy CONFIG_JUMP_LABEL=3Dy CONFIG_MODULES=3Dy CONFIG_MODULE_UNLOAD=3Dy @@ -303,14 +301,56 @@ CONFIG_SECURITY=3Dy CONFIG_SECURITY_NETWORK=3Dy CONFIG_SECURITY_SELINUX=3Dy CONFIG_SECURITY_SELINUX_BOOTPARAM=3Dy +CONFIG_LIST_HARDENED=3Dy CONFIG_PRINTK_TIME=3Dy +CONFIG_BOOT_PRINTK_DELAY=3Dy +CONFIG_DYNAMIC_DEBUG=3Dy CONFIG_DEBUG_KERNEL=3Dy -CONFIG_MAGIC_SYSRQ=3Dy +CONFIG_STRIP_ASM_SYMS=3Dy +CONFIG_HEADERS_INSTALL=3Dy +CONFIG_DEBUG_SECTION_MISMATCH=3Dy +CONFIG_KGDB=3Dy +CONFIG_KGDB_TESTS=3Dy +CONFIG_KGDB_LOW_LEVEL_TRAP=3Dy +CONFIG_KGDB_KDB=3Dy +CONFIG_KDB_KEYBOARD=3Dy +CONFIG_UBSAN=3Dy +CONFIG_UBSAN_SHIFT=3Dy +CONFIG_PAGE_OWNER=3Dy +CONFIG_PAGE_POISONING=3Dy CONFIG_DEBUG_WX=3Dy +CONFIG_PER_VMA_LOCK_STATS=3Dy CONFIG_DEBUG_STACK_USAGE=3Dy +CONFIG_SCHED_STACK_END_CHECK=3Dy +CONFIG_KFENCE=3Dy +CONFIG_DEBUG_SHIRQ=3Dy +CONFIG_PANIC_ON_OOPS=3Dy +CONFIG_HARDLOCKUP_DETECTOR=3Dy +CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=3Dy +CONFIG_WQ_CPU_INTENSIVE_REPORT=3Dy CONFIG_SCHEDSTATS=3Dy +CONFIG_NMI_CHECK_CPU=3Dy +CONFIG_RCU_CPU_STALL_CPUTIME=3Dy +CONFIG_BOOTTIME_TRACING=3Dy +CONFIG_FUNCTION_GRAPH_RETVAL=3Dy +CONFIG_FPROBE=3Dy +CONFIG_FUNCTION_PROFILER=3Dy +CONFIG_STACK_TRACER=3Dy +CONFIG_SCHED_TRACER=3Dy +CONFIG_HWLAT_TRACER=3Dy +CONFIG_TIMERLAT_TRACER=3Dy +CONFIG_MMIOTRACE=3Dy +CONFIG_FTRACE_SYSCALLS=3Dy CONFIG_BLK_DEV_IO_TRACE=3Dy +CONFIG_USER_EVENTS=3Dy +CONFIG_HIST_TRIGGERS=3Dy +CONFIG_TRACE_EVENT_INJECT=3Dy +CONFIG_RV=3Dy +CONFIG_RV_MON_WWNR=3Dy CONFIG_PROVIDE_OHCI1394_DMA_INIT=3Dy CONFIG_EARLY_PRINTK_DBGP=3Dy +CONFIG_EARLY_PRINTK_USB_XDBC=3Dy CONFIG_DEBUG_BOOT_PARAMS=3Dy CONFIG_DEBUG_ENTRY=3Dy +CONFIG_FUNCTION_ERROR_INJECTION=3Dy +CONFIG_MEMTEST=3Dy --=20 2.45.2