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selftests: Print the test we're running to /dev/kmsg

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Some tests cause the kernel to print things to the kernel log
buffer (ie. printk), in particular oops and warnings etc. However when
running all the tests in succession it's not always obvious which
test(s) caused the kernel to print something.

We can narrow it down by printing which test directory we're running
in to /dev/kmsg, if it's writable.

Example output:

  [  170.149149] kselftest: Running tests in powerpc
  [  305.300132] kworker/dying (71) used greatest stack depth: 7776 bytes
                 left
  [  808.915456] kselftest: Running tests in pstore

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
Michael Ellerman 2018-03-23 20:44:27 +11:00 committed by Shuah Khan
parent 6c3b6d5083
commit 88893cf787
1 changed files with 1 additions and 0 deletions
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1
tools/testing/selftests/Makefile
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@ -138,6 +138,7 @@ ifdef INSTALL_PATH
echo "echo ; echo TAP version 13" >> $(ALL_SCRIPT); \
echo "echo Running tests in $$TARGET" >> $(ALL_SCRIPT); \
echo "echo ========================================" >> $(ALL_SCRIPT); \
echo "[ -w /dev/kmsg ] && echo \"kselftest: Running tests in $$TARGET\" >> /dev/kmsg" >> $(ALL_SCRIPT); \
echo "cd $$TARGET" >> $(ALL_SCRIPT); \
make -s --no-print-directory OUTPUT=$$BUILD_TARGET -C $$TARGET emit_tests >> $(ALL_SCRIPT); \
echo "cd \$$ROOT" >> $(ALL_SCRIPT); \