s390/ftrace: optimize function graph caller code

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When the function graph tracer is disabled we can skip three additional
instructions. So let's just do this.

So if function tracing is enabled but function graph tracing is
runtime disabled, we get away with a single unconditional branch.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Heiko Carstens 2014-08-15 12:33:46 +02:00 • committed by Martin Schwidefsky

parent 0f1b1ff54b

commit 2481a87b02

3 changed files with 34 additions and 6 deletions

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1

arch/s390/include/asm/ftrace.h

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24

arch/s390/kernel/ftrace.c

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15

arch/s390/kernel/mcount64.S

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