s390/cpum_cf: prepare for in-kernel counter measurements

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Prepare the counter facility support to be used by other in-kernel
users.  The first step introduces the __kernel_cpumcf_begin() and
__kernel_cpumcf_end() functions to reserve the counter facility
for doing measurements and to release after the measurements are
done.

Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Hendrik Brueckner 2018-08-06 17:43:07 +02:00 • committed by Martin Schwidefsky

parent 30e145f811

commit 3d33345aa3

2 changed files with 29 additions and 6 deletions

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3

arch/s390/include/asm/cpu_mcf.h

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32

arch/s390/kernel/perf_cpum_cf.c

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