mirror of
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A mirror of the official Linux kernel repository just in case
b1a9a5e047
CONFIG_DEBUG_INFO_BTF=y requires one additional link step. (.tmp_vmlinux.btf) CONFIG_KALLSYMS=y requires two additional link steps. (.tmp_vmlinux.kallsyms1 and .tmp_vmlinux.kallsyms2) Enabling both requires three additional link steps. When CONFIG_DEBUG_INFO_BTF=y and CONFIG_KALLSYMS=y, the current build process is as follows: KSYMS .tmp_vmlinux.kallsyms0.S AS .tmp_vmlinux.kallsyms0.o LD .tmp_vmlinux.btf # temporary vmlinux for BTF BTF .btf.vmlinux.bin.o LD .tmp_vmlinux.kallsyms1 # temporary vmlinux for kallsyms step 1 NM .tmp_vmlinux.kallsyms1.syms KSYMS .tmp_vmlinux.kallsyms1.S AS .tmp_vmlinux.kallsyms1.o LD .tmp_vmlinux.kallsyms2 # temporary vmlinux for kallsyms step 2 NM .tmp_vmlinux.kallsyms2.syms KSYMS .tmp_vmlinux.kallsyms2.S AS .tmp_vmlinux.kallsyms2.o LD vmlinux # final vmlinux This is redundant because the BTF generation and the kallsyms step 1 can be performed against the same temporary vmlinux. When both CONFIG_DEBUG_INFO_BTF and CONFIG_KALLSYMS are enabled, we can reduce the number of link steps by one. This commit changes the build process as follows: KSYMS .tmp_vmlinux0.kallsyms.S AS .tmp_vmlinux0.kallsyms.o LD .tmp_vmlinux1 # temporary vmlinux for BTF and kallsyms step 1 BTF .tmp_vmlinux1.btf.o NM .tmp_vmlinux1.syms KSYMS .tmp_vmlinux1.kallsyms.S AS .tmp_vmlinux1.kallsyms.o LD .tmp_vmlinux2 # temporary vmlinux for kallsyms step 2 NM .tmp_vmlinux2.syms KSYMS .tmp_vmlinux2.kallsyms.S AS .tmp_vmlinux2.kallsyms.o LD vmlinux # final vmlinux Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
io_uring | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
rust | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.editorconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
.rustfmt.toml | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the reStructuredText markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.