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

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

[Michael Ellerman]

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>
---
 tools/testing/selftests/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7442dfb73b7f..0fbe778efd5f 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -130,6 +130,7 @@ ifdef INSTALL_PATH
 		BUILD_TARGET=$$BUILD/$$TARGET;	\
 		echo "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); \
-- 
2.14.1

Re: [PATCH] selftests: Print the test we're running to /dev/kmsg

[Shuah Khan]

On 03/23/2018 03:44 AM, Michael Ellerman wrote:
> 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>
> ---
>  tools/testing/selftests/Makefile | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 7442dfb73b7f..0fbe778efd5f 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -130,6 +130,7 @@ ifdef INSTALL_PATH
>  		BUILD_TARGET=$$BUILD/$$TARGET;	\
>  		echo "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); \
> 

Thanks Michael. I will get this to 4.17-rc1

-- Shuah