user/sven/linux.git/kernel/gen_kheaders.sh, branch v5.4.58

kheaders: substituting --sort in archive creation

2019-10-17T00:08:19Z

The option --sort=ORDER was only introduced in tar 1.28 (2014), which is rather new and might not be available in some setups. This patch tries to replicate the previous behaviour as closely as possible to fix the kheaders build for older environments. It does not produce identical archives compared to the previous version due to minor sorting differences but produces reproducible results itself in my tests. Reported-by: Andreas Schwab Signed-off-by: Dmitry Goldin Tested-by: Andreas Schwab Tested-by: Quentin Perret Signed-off-by: Masahiro Yamada

kheaders: make headers archive reproducible

2019-10-05T06:29:49Z

In commit 43d8ce9d65a5 ("Provide in-kernel headers to make extending kernel easier") a new mechanism was introduced, for kernels >=5.2, which embeds the kernel headers in the kernel image or a module and exposes them in procfs for use by userland tools. The archive containing the header files has nondeterminism caused by header files metadata. This patch normalizes the metadata and utilizes KBUILD_BUILD_TIMESTAMP if provided and otherwise falls back to the default behaviour. In commit f7b101d33046 ("kheaders: Move from proc to sysfs") it was modified to use sysfs and the script for generation of the archive was renamed to what is being patched. Signed-off-by: Dmitry Goldin Reviewed-by: Greg Kroah-Hartman Reviewed-by: Joel Fernandes (Google) Signed-off-by: Masahiro Yamada

kheaders: include only headers into kheaders_data.tar.xz

2019-07-09T01:10:52Z

Currently, kheaders_data.tar.xz contains some build scripts as well as headers. None of them is needed in the header archive. For ARCH=x86, this commit excludes the following from the archive: arch/x86/include/asm/Kbuild arch/x86/include/uapi/asm/Kbuild include/asm-generic/Kbuild include/config/auto.conf include/config/kernel.release include/config/tristate.conf include/uapi/asm-generic/Kbuild include/uapi/Kbuild kernel/gen_kheaders.sh This change is actually motivated for the planned header compile-testing because it will generate more build artifacts, which should not be included in the archive. Signed-off-by: Masahiro Yamada Reviewed-by: Joel Fernandes (Google)

kheaders: remove meaningless -R option of 'ls'

2019-07-09T01:10:52Z

The -R option of 'ls' is supposed to be used for directories. -R, --recursive list subdirectories recursively Since 'find ... -type f' only matches to regular files, we do not expect directories passed to the 'ls' command here. Giving -R is harmless at least, but unneeded. Signed-off-by: Masahiro Yamada Reviewed-by: Joel Fernandes (Google)

kheaders: Do not regenerate archive if config is not changed

2019-05-24T18:16:01Z

Linus reported an issue that doing an allmodconfig was causing the kheaders archive to be regenerated even though the config is the same. This patch fixes the issue by ignoring the config-related header files for "knowing when to regenerate based on timestamps". Instead, if the CONFIG_X_Y option really changes, then we there are the include/config/X/Y.h which will already tells us "if a config really changed". So we don't really need these files for regeneration detection anyway, and ignoring them fixes Linus's issue. Reported-by: Linus Torvalds Signed-off-by: Joel Fernandes (Google) Signed-off-by: Greg Kroah-Hartman

kheaders: Move from proc to sysfs

2019-05-24T18:16:01Z

The kheaders archive consisting of the kernel headers used for compiling bpf programs is in /proc. However there is concern that moving it here will make it permanent. Let us move it to /sys/kernel as discussed [1]. [1] https://lore.kernel.org/patchwork/patch/1067310/#1265969 Suggested-by: Steven Rostedt Signed-off-by: Joel Fernandes (Google) Signed-off-by: Greg Kroah-Hartman