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powerpc/ftrace: Refactor prepare_ftrace_return() 

When we have CONFIG_DYNAMIC_FTRACE_WITH_ARGS,
prepare_ftrace_return() is called by ftrace_graph_func()
otherwise prepare_ftrace_return() is called from assembly.

Refactor prepare_ftrace_return() into a static
__prepare_ftrace_return() that will be called by both
prepare_ftrace_return() and ftrace_graph_func().

It will allow GCC to fold __prepare_ftrace_return() inside
ftrace_graph_func().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0d42deafe353980c66cf19d3132638c05ba9f4a9.1652074503.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-05-09 07:35:59 +02:00 committed by Michael Ellerman
parent 804c0a166f
commit d996d5053e
1 changed files with 9 additions and 3 deletions
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12
arch/powerpc/kernel/trace/ftrace.c
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@ -939,8 +939,8 @@ int ftrace_disable_ftrace_graph_caller(void)
* Hook the return address and push it in the stack of return addrs
* in current thread info. Return the address we want to divert to.
*/
unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
unsigned long sp)
static unsigned long
__prepare_ftrace_return(unsigned long parent, unsigned long ip, unsigned long sp)
{
unsigned long return_hooker;
int bit;
@ -969,7 +969,13 @@ out:
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct ftrace_regs *fregs)
{
fregs->regs.link = prepare_ftrace_return(parent_ip, ip, fregs->regs.gpr[1]);
fregs->regs.link = __prepare_ftrace_return(parent_ip, ip, fregs->regs.gpr[1]);
}
#else
unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
unsigned long sp)
{
return __prepare_ftrace_return(parent, ip, sp);
}
#endif
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */