[PATCH 5.4 0/2] Fix kselftest builds when specifying an output dir

[Tyler Hicks <code@tyhicks.com>]

From: "Tyler Hicks" <code@tyhicks.com>

When attempting to build kselftests with a separate output directory, a
number of the tests fail to build.

For example,

 $ rm -rf build && \
   make INSTALL_HDR_PATH=build/usr headers_install > /dev/null && \
   make O=build FORCE_TARGETS=1 TARGETS=breakpoints -C tools/testing/selftests > /dev/null
 /usr/bin/ld: cannot open output file
 build/kselftest/breakpoints/step_after_suspend_test: No such file or directory
 collect2: error: ld returned 1 exit status
 make[1]: *** [../lib.mk:146: build/kselftest/breakpoints/step_after_suspend_test] Error 1
 make: *** [Makefile:163: all] Error 2

This has already been addressed upstream with v5.18 commit 5ad51ab618de
("selftests: set the BUILD variable to absolute path"). It does not
cleanly cherry pick to the linux-5.4.y branch without v5.7 commit
29e911ef7b70 ("selftests: Fix kselftest O=objdir build from cluttering
top level objdir"). Commit 5ad51ab618de was written in a way that
assumes that the kselftests aren't build in the top level objdir so it
makes sense to bring the pre-req commit back but it does represent a
slight change in behavior since the kselftests will now be built in a
subdir of the specified objdir (O=). 

Tyler

Muhammad Usama Anjum (1):
  selftests: set the BUILD variable to absolute path

Shuah Khan (1):
  selftests: Fix kselftest O=objdir build from cluttering top level
    objdir

 tools/testing/selftests/Makefile | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

-- 
2.34.1