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569f8b501b
The build failure reported in [1] occurred because commit <9fc96c7c19df>
("selftests: error out if kernel header files are not yet built") added
a new "kernel_header_files" dependency to "all", and that triggered
another, pre-existing problem. Specifically, the arm64 selftests
override the emit_tests target, and that override improperly declares
itself to depend upon the "all" target.
This is a problem because the "emit_tests" target in lib.mk was not
intended to be overridden. emit_tests is a very simple, sequential build
target that was originally invoked from the "install" target, which in
turn, depends upon "all".
That approach worked for years. But with 9fc96c7c19 in place,
emit_tests failed, because it does not set up all of the elaborate
things that "install" does. And that caused the new
"kernel_header_files" target (which depends upon $(KBUILD_OUTPUT) being
correct) to fail.
Some detail: The "all" target is .PHONY. Therefore, each target that
depends on "all" will cause it to be invoked again, and because
dependencies are managed quite loosely in the selftests Makefiles, many
things will run, even "all" is invoked several times in immediate
succession. So this is not a "real" failure, as far as build steps go:
everything gets built, but "all" reports a problem when invoked a second
time from a bad environment.
To fix this, simply remove the unnecessary "all" dependency from the
overridden emit_tests target. The dependency is still effectively
honored, because again, invocation is via "install", which also depends
upon "all".
An alternative approach would be to harden the emit_tests target so that
it can depend upon "all", but that's a lot more complicated and hard to
get right, and doesn't seem worth it, especially given that emit_tests
should probably not be overridden at all.
[1] https://lore.kernel.org/20230710-kselftest-fix-arm64-v1-1-48e872844f25@kernel.org
Fixes: 9fc96c7c19 ("selftests: error out if kernel header files are not yet built")
Reported-by: Mark Brown <broonie@kernel.org>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Tested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
57 lines
1.4 KiB
Makefile
57 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# When ARCH not overridden for crosscompiling, lookup machine
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ARCH ?= $(shell uname -m 2>/dev/null || echo not)
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ifneq (,$(filter $(ARCH),aarch64 arm64))
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ARM64_SUBTARGETS ?= tags signal pauth fp mte bti abi
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else
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ARM64_SUBTARGETS :=
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endif
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CFLAGS := -Wall -O2 -g
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# A proper top_srcdir is needed by KSFT(lib.mk)
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top_srcdir = $(realpath ../../../../)
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# Additional include paths needed by kselftest.h and local headers
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CFLAGS += -I$(top_srcdir)/tools/testing/selftests/
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CFLAGS += $(KHDR_INCLUDES)
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export CFLAGS
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export top_srcdir
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all:
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@for DIR in $(ARM64_SUBTARGETS); do \
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BUILD_TARGET=$(OUTPUT)/$$DIR; \
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mkdir -p $$BUILD_TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \
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done
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install: all
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@for DIR in $(ARM64_SUBTARGETS); do \
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BUILD_TARGET=$(OUTPUT)/$$DIR; \
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make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \
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done
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run_tests: all
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@for DIR in $(ARM64_SUBTARGETS); do \
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BUILD_TARGET=$(OUTPUT)/$$DIR; \
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make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \
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done
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# Avoid any output on non arm64 on emit_tests
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emit_tests:
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@for DIR in $(ARM64_SUBTARGETS); do \
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BUILD_TARGET=$(OUTPUT)/$$DIR; \
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make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \
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done
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clean:
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@for DIR in $(ARM64_SUBTARGETS); do \
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BUILD_TARGET=$(OUTPUT)/$$DIR; \
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make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \
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done
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.PHONY: all clean install run_tests emit_tests
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