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powerpc64/ftrace: Implement support for ftrace_regs_caller()

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With -mprofile-kernel, we always save the full register state in
ftrace_caller(). While this works, this is inefficient if we're not
interested in the register state, such as when we're using the function
tracer.

Rename the existing ftrace_caller() as ftrace_regs_caller() and provide
a simpler implementation for ftrace_caller() that is used when registers
are not required to be saved.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
2018-04-19 12:34:09 +05:30
committed by Michael Ellerman
parent 9ef4042364
commit ae30cc05be
5 changed files with 262 additions and 26 deletions
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2
arch/powerpc/include/asm/ftrace.h
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@@ -49,8 +49,6 @@
extern void _mcount(void);
#ifdef CONFIG_DYNAMIC_FTRACE
# define FTRACE_ADDR ((unsigned long)ftrace_caller)
# define FTRACE_REGS_ADDR FTRACE_ADDR
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
/* reloction of mcount call site is the same as the address */