From nobody Mon Feb 9 00:54:29 2026 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 E71BD205E26 for ; Mon, 5 May 2025 11:10:30 +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=1746443431; cv=none; b=K0Clq+EIlLm/hdBlb6JS5vxgiD1itAy+0waFVwZRion8wpyITpbrXYT6JB6K6teJgGOR0YwUYbjTgjQKc25qAtqUuQhwsknm1Gec/fZF2QfIZ6NnTUJ13BZrFiiL3Qw09hNH/CaJR8kio2EeZx5pfUUNdyHkJDPhrED4xuspjyw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746443431; c=relaxed/simple; bh=Pt+p7zDcd5Dd2Egjs/IMAeZBuEr2l+v5gQzfym0JIQM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=liCN1zmclN+42LthQvdnboNChI6+Hzgt8kVEm8TPf3LgmeZ7pMKqwX26HyXpnMeDymfxBS0Oo/9/Ksuh9hZCzF5YGJQYOnJHbyF7onYrLGLphVNpo54UbbeFcsNY6aPo3WW1KRcxmwnVkMMmrCK5WRQg6YTzKr8smq6OgZyuBqY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Z8C03a2e; 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="Z8C03a2e" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CAE9DC4CEE4; Mon, 5 May 2025 11:10:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746443430; bh=Pt+p7zDcd5Dd2Egjs/IMAeZBuEr2l+v5gQzfym0JIQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z8C03a2eQXWQZ6EaF5qDC6alzB37KP3wfEp3g0rpaNdp8wxnRG018EsmwrutnELm/ Fuh6Qx2eVOrKJwu4t1l5qAaZCk8Pfjx08/AqV4122S5QrPr0nHhvv6Bl7Dnj2vT1Ak +W9D9H/B63Gdy2FfyV1TIeGiZ5XAKYKVmO9wGIsthnbJ9WoPmp2QQx1gtu3KyVI0Vv 59TXrZCp13uuDXijMKjKKTa9KxtysyiOtDgj+fvRxw/NMnU6DA9wFW7LiBhacp3Lxq 1IGsTuyuoJPt9IYDeBfEARVnZ+ee4GfIF8MUqPiXFCj1Ag4crBhJUe+5HIA6em/PRe 7/LTNb0/dYa+A== From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: "H . Peter Anvin" , Linus Torvalds , Peter Zijlstra , Borislav Petkov , Thomas Gleixner , Ingo Molnar , Ard Biesheuvel , Arnd Bergmann , David Woodhouse , Masahiro Yamada , Michal Marek Subject: [PATCH 12/15] x86/kconfig/64: Enable popular kernel debugging options in the defconfig Date: Mon, 5 May 2025 13:09:43 +0200 Message-ID: <20250505110946.1095363-13-mingo@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250505110946.1095363-1-mingo@kernel.org> References: <20250505110946.1095363-1-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_DEBUG_LIST=3Dy: Fedora/RHEL have it enabled, while Ubuntu has it disabled. - 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: 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 4f2fab465196..3d585c33016b 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 @@ -69,7 +68,6 @@ 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 @@ -298,13 +296,55 @@ CONFIG_SECURITY_NETWORK=3Dy CONFIG_SECURITY_SELINUX=3Dy CONFIG_SECURITY_SELINUX_BOOTPARAM=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_DEBUG_LIST=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