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Running "make" on an already compiled kernel tree will rebuild the kernel even without any modifications: $ make ARCH=arm64 CROSS_COMPILE=/usr/bin/aarch64-unknown-linux-gnu- arch/arm64/Makefile:58: CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built CALL scripts/checksyscalls.sh CALL scripts/atomic/check-atomics.sh VDSOCHK arch/arm64/kernel/vdso/vdso.so.dbg VDSOSYM include/generated/vdso-offsets.h CHK include/generated/compile.h CC arch/arm64/kernel/signal.o CC arch/arm64/kernel/vdso.o CC arch/arm64/kernel/signal32.o LD arch/arm64/kernel/vdso/vdso.so.dbg OBJCOPY arch/arm64/kernel/vdso/vdso.so AS arch/arm64/kernel/vdso/vdso.o AR arch/arm64/kernel/vdso/built-in.a AR arch/arm64/kernel/built-in.a GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o AR init/built-in.a LD vmlinux.o This is the same bug fixed in commit92a4728608("x86/boot: Fix if_changed build flip/flop bug"). We cannot use two "if_changed" in one target. Fix this build bug by merging two commands into one function. Fixes:a7f71a2c89("arm64: compat: Add vDSO") Fixes:28b1a824a4("arm64: vdso: Substitute gettimeofday() with C implementation") Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> [will: merged in compat fix from Vincenzo and made rule names consistent] Signed-off-by: Will Deacon <will@kernel.org> (cherry picked from commit2e2f3c9b86) Signed-off-by: Mark Salyzyn <salyzyn@google.com> Bug: 154668398 Change-Id: I21c1e8e2678898ef895a41a03dc98631052a6b38
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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.