powerpc: split ret_from_fork

... and get rid of in-kernel syscalls in kernel_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index b40e0b4815b3..d7f4fafc7515 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -370,6 +370,16 @@ _GLOBAL(ret_from_fork)
         li      r3,0
         b       syscall_exit
 
+_GLOBAL(ret_from_kernel_thread)
+        bl      .schedule_tail
+        REST_NVGPRS(r1)
+        REST_GPR(2,r1)
+        mtlr    r14
+        mr      r3,r15
+        blrl
+        li      r3,0
+        b       .do_exit        # no return
+
         .section        ".toc","aw"
 DSCR_DEFAULT:
         .tc dscr_default[TC],dscr_default