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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2014-08-15 12:33:46 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-09-09 08:53:28 +0200 |
| commit | 2481a87b0250bbf429fc8cdc78331efbc44a0221 (patch) | |
| tree | 0bf818ad656c2c12bbe4bc5b7882c99826439b93 /arch/s390/include/asm/ftrace.h | |
| parent | s390: pass march flag to assembly files as well (diff) | |
| download | linux-dev-2481a87b0250bbf429fc8cdc78331efbc44a0221.tar.xz linux-dev-2481a87b0250bbf429fc8cdc78331efbc44a0221.zip | |
s390/ftrace: optimize function graph caller code
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>
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index bf246dae1367..7b8e456d76c9 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -4,6 +4,7 @@ #ifndef __ASSEMBLY__ extern void _mcount(void); +extern char ftrace_graph_caller_end; struct dyn_arch_ftrace { }; |