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powerpc/ftrace: Refactor ftrace_{en/dis}able_ftrace_graph_caller 

ftrace_enable_ftrace_graph_caller() and
ftrace_disable_ftrace_graph_caller() have common code.

They will have even more common code after following patch.

Refactor into a single ftrace_modify_ftrace_graph_caller() function.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f37785a531f1a8f201e1b3da45997a5c77e9d820.1640017960.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-12-20 16:38:31 +00:00 committed by Michael Ellerman
parent 40b035efe2
commit 0c81ed5ed4
1 changed files with 9 additions and 12 deletions
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21
arch/powerpc/kernel/trace/ftrace.c
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@ -910,30 +910,27 @@ int __init ftrace_dyn_arch_init(void)
extern void ftrace_graph_call(void);
extern void ftrace_graph_stub(void);
int ftrace_enable_ftrace_graph_caller(void)
static int ftrace_modify_ftrace_graph_caller(bool enable)
{
unsigned long ip = (unsigned long)(&ftrace_graph_call);
unsigned long addr = (unsigned long)(&ftrace_graph_caller);
unsigned long stub = (unsigned long)(&ftrace_graph_stub);
ppc_inst_t old, new;
old = ftrace_call_replace(ip, stub, 0);
new = ftrace_call_replace(ip, addr, 0);
old = ftrace_call_replace(ip, enable ? stub : addr, 0);
new = ftrace_call_replace(ip, enable ? addr : stub, 0);
return ftrace_modify_code(ip, old, new);
}
int ftrace_enable_ftrace_graph_caller(void)
{
return ftrace_modify_ftrace_graph_caller(true);
}
int ftrace_disable_ftrace_graph_caller(void)
{
unsigned long ip = (unsigned long)(&ftrace_graph_call);
unsigned long addr = (unsigned long)(&ftrace_graph_caller);
unsigned long stub = (unsigned long)(&ftrace_graph_stub);
ppc_inst_t old, new;
old = ftrace_call_replace(ip, addr, 0);
new = ftrace_call_replace(ip, stub, 0);
return ftrace_modify_code(ip, old, new);
return ftrace_modify_ftrace_graph_caller(false);
}
/*