s390/ftrace: provide separate ftrace_caller/ftrace_regs_caller implementations

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ftrace_regs_caller is an alias to ftrace_caller - making ftrace_caller
quite heavyweight. Split the function and provide an ftrace_caller
implementation which comes with fewer instructions. Especially getting
rid of 'stosm' on each function entry should help here, e.g. to
have less performance impact on live patched functions.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Heiko Carstens 2021-10-04 20:24:12 +02:00 • committed by Vasily Gorbik

parent 176510ebec

commit 894979689d

2 changed files with 29 additions and 13 deletions

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1

arch/s390/include/asm/ftrace.h

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41

arch/s390/kernel/mcount.S

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