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Date: Fri, 27 Mar 2026 14:32:34 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: linux-kbuild@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: tools/testing/selftests
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whinges, perrmanits, maybe I'm doing it wrong, etc.

a)

At the top-level, neither `make mrproper' nor `make clean' remove the
executables from tools/testing/selftests/mm/.  Seems wrong?

b)

Shouldn't I be able to run

	make selftests

from the top level?

c)

tools/testing/selftests/mm
make clean
make

does:

  CC       droppable
  CC       guard-regions
  CC       merge
  CC       rmap
  CC       soft-dirty
gcc -Wall -O2 -I /usr/src/25/tools/testing/selftests/../../..  -isystem /usr/src/25/tools/testing/selftests/../../../usr/include -isystem /usr/src/25/tools/testing/selftests/../../../tools/include/uapi -Wunreachable-code -U_FORTIFY_SOURCE -no-pie -D_GNU_SOURCE= -I/usr/src/25/tools/testing/selftests/../../../tools/testing/selftests  -m32 -mxsave  protection_keys.c vm_util.c thp_settings.c pkey_util.c -lrt -lpthread -lm -lrt -ldl -lm -o /usr/src/25/tools/testing/selftests/mm/protection_keys_32
gcc -Wall -O2 -I /usr/src/25/tools/testing/selftests/../../..  -isystem /usr/src/25/tools/testing/selftests/../../../usr/include -isystem /usr/src/25/tools/testing/selftests/../../../tools/include/uapi -Wunreachable-code -U_FORTIFY_SOURCE -no-pie -D_GNU_SOURCE= -I/usr/src/25/tools/testing/selftests/../../../tools/testing/selftests  -m32 -mxsave  pkey_sighandler_tests.c vm_util.c thp_settings.c pkey_util.c -lrt -lpthread -lm -lrt -ldl -lm -o /usr/src/25/tools/testing/selftests/mm/pkey_sighandler_tests_32

why did it start emitting the gcc command lines?

d) within tools/testing/selftests/mm:

	make clean
	make -j100

   compiles 3-4 things then ends.

   A subsequent `make -j1' compiles nothing.

   Whereas

	make clean
	make -j1

   compiles everything.  Slowly.

Thanks.