feat(virtio-linux): further strip out unnecessary kconfigs - #569

🏁 Script executed:

#!/bin/sh
set -eu

config="${OUTPUT_DIR:?}/usr/share/virtio-linux/config"

for sym in KEXEC KEXEC_FILE KEXEC_CORE CRASH_DUMP; do
  if grep -qx "CONFIG_${sym}=y" "$config"; then
    echo "unexpected CONFIG_${sym}=y" >&2
    exit 1
  fi
done

Repository: gominimal/pkgs

Length of output: 204

🏁 Script executed:

#!/bin/sh
set -eu

printf '%s\n' '--- build script structure ---'
ast-grep outline packages/virtio-linux/build.sh 2>/dev/null || true

printf '%s\n' '--- relevant build script sections ---'
sed -n '1,90p' packages/virtio-linux/build.sh
sed -n '280,355p' packages/virtio-linux/build.sh

printf '%s\n' '--- configuration and architecture references ---'
rg -n --no-heading 'nope|defconfig|KEXEC|CRASH_DUMP|KERNEL_ARCH|ARCH|aarch64|arm64|olddefconfig|savedefconfig|config' packages/virtio-linux/build.sh packages/virtio-linux/build.ncl

Repository: gominimal/pkgs

Length of output: 13902

🏁 Script executed:

#!/bin/sh
set -eu

printf '%s\n' '--- nope() and final configuration checks ---'
sed -n '82,112p' packages/virtio-linux/build.sh
sed -n '350,375p' packages/virtio-linux/build.sh

printf '%s\n' '--- repository references ---'
rg -n --no-heading 'FORBIDDEN|CONFIG_KEXEC_FILE|KEXEC_FILE|KEXEC_CORE' .

Repository: gominimal/pkgs

Length of output: 2281

🌐 Web query:

Linux v6.12 Kconfig KEXEC_FILE KEXEC_CORE KEXEC dependency init/Kconfig

💡 Result:

In Linux kernel v6.12, the configuration options related to kexec are consolidated within the kernel/Kconfig.kexec file [1][2]. The dependencies and relationships between KEXEC, KEXEC_FILE, and KEXEC_CORE are structured as follows: KEXEC_CORE This is a hidden boolean configuration symbol that acts as a core dependency for both the traditional kexec and the file-based kexec interfaces [3][1][4]. It does not have user-visible prompt text and is selected by both KEXEC and KEXEC_FILE [3][1]. KEXEC (Enable kexec system call) This option enables the traditional kexec system call [3][1]. - Depends on: ARCH_SUPPORTS_KEXEC (defined by individual architectures) [3][1]. - Selects: KEXEC_CORE [3][1]. KEXEC_FILE (Enable kexec file based system call) This option enables the newer, file-based kexec system call that uses file descriptors for the kernel and initramfs [3][1]. - Depends on: ARCH_SUPPORTS_KEXEC_FILE (defined by individual architectures) [3][1]. - Selects: KEXEC_CORE [3][1]. - Additionally selects: CRYPTO and CRYPTO_LIB_SHA256 (or CRYPTO_SHA256, depending on the specific kernel branch) to support the required cryptographic verification of the kernel image [3][1][4][5]. In summary, KEXEC_CORE is the underlying infrastructure required by both KEXEC and KEXEC_FILE, and both options explicitly select it to ensure it is enabled when either is configured [1][6]. The architecture-specific support is enforced by the ARCH_SUPPORTS_KEXEC and ARCH_SUPPORTS_KEXEC_FILE dependencies, which prevent these features from being enabled on architectures that do not support them [2].

Citations:

• 1: https://github.com/torvalds/linux/blob/master/kernel/Kconfig.kexec
• 2: steev/linux@89cde45
• 3: https://github.com/bytesatwork/ti-linux-kernel/blob/baw-ti-linux-6.12.y-11.01.05/kernel/Kconfig.kexec
• 4: https://gbmc.googlesource.com/linux/+/4412b8b23de24a94a0b78ac283db043c833a3975/kernel/Kconfig.kexec
• 5: https://elixir.bootlin.com/linux/v7.1-rc6/source/kernel/Kconfig.kexec
• 6: https://docs.kernel.org/6.11/admin-guide/kdump/kdump.html