From 81dac817786263bb44cd5a200a07eff346f78e31 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Tue, 15 Jan 2019 17:37:36 +1100
Subject: [PATCH] powerpc/64: Make sys_switch_endian() traceable

Patch-mainline: v5.1-rc1
References: bsc#1065729
Git-commit: 81dac817786263bb44cd5a200a07eff346f78e31

We weren't using SYSCALL_DEFINE for sys_switch_endian(), which means
it wasn't able to be traced by CONFIG_FTRACE_SYSCALLS.

By using the macro we create the right metadata and the syscall is
visible. eg:

  # cd /sys/kernel/debug/tracing
  # echo 1 | tee events/syscalls/sys_*_switch_endian/enable
  # ~/switch_endian_test
  # cat trace
  ...
  switch_endian_t-3604  [009] ....   315.175164: sys_switch_endian()
  switch_endian_t-3604  [009] ....   315.175167: sys_switch_endian -> 0x5555aaaa5555aaaa
  switch_endian_t-3604  [009] ....   315.175169: sys_switch_endian()
  switch_endian_t-3604  [009] ....   315.175169: sys_switch_endian -> 0x5555aaaa5555aaaa

Fixes: 529d235a0e19 ("powerpc: Add a proper syscall for switching endianness")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/kernel/syscalls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kernel/syscalls.c
+++ b/arch/powerpc/kernel/syscalls.c
@@ -123,7 +123,7 @@ long ppc_fadvise64_64(int fd, int advice
 			     (u64)len_high << 32 | len_low, advice);
 }
 
-long sys_switch_endian(void)
+SYSCALL_DEFINE0(switch_endian)
 {
 	struct thread_info *ti;