selftests/powerpc/dscr: Add lockstep test cases to DSCR explicit tests

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Add new cases to the relevant tests that use explicitly synchronized
threads to test the behaviour across context switches with less
randomness. By locking the participants to the same CPU we guarantee a
context switch occurs each time they make progress, which is a likely
failure point if the kernel is not tracking the thread local DSCR
correctly.

The random case is left in to keep exercising potential edge cases.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230406043320.125138-5-bgray@linux.ibm.com

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Benjamin Gray 2023-04-06 14:33:17 +10:00 • committed by Michael Ellerman

parent 6ff4dc2548

commit fda8158870

3 changed files with 159 additions and 14 deletions

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1

tools/testing/selftests/powerpc/dscr/Makefile

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87

tools/testing/selftests/powerpc/dscr/dscr_default_test.c

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87

tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c

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