I was intended to add -fpatchable-function-entry based new ftrace implementation in parallel 
with old -pg based one, which is enabled by supported gcc version at build time, since 

+. the fix for -fpatchable-function-entry is not merge into upstream; 

+. the -fpatchable-function-entry does not support static function tracing which is rarely used today, 
which is only implemented in the old -pg based implementation;

Move FTRACE_SYSCALLS into syscall.c, so both new and old implementation can easily be switched
freely. When everything is all right, old one can be easily removed, and that is patch 1/2/3 intended for

On Mar 26, 2021, at 3:38 AM, Steven Rostedt [off-list ref] wrote:

On Sat, 13 Mar 2021 14:41:45 +0800
Huang Pei [off-list ref] wrote:

Why?

-- Steve

quoted

Signed-off-by: Huang Pei <redacted>
---
arch/mips/kernel/Makefile  |  1 -
arch/mips/kernel/ftrace.c  | 33 ---------------------------------
arch/mips/kernel/syscall.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 32 insertions(+), 34 deletions(-)