powerpc: don't mess with r2 in copy_thread() and friends

kernel_thread() callbacks are *not* in modules and are not going to
be there.  And it's not even read in ppc32 ret_from_kernel_thread(),
so no need to bother with it there either.

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

2 files changed, 0 insertions, 3 deletions

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2eb766ad1c5c..8fdb05146ca0 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -373,7 +373,6 @@ _GLOBAL(ret_from_fork)
 _GLOBAL(ret_from_kernel_thread)
         bl      .schedule_tail
         REST_NVGPRS(r1)
-        REST_GPR(2,r1)
         mtlr    r14
         mr      r3,r15
         blrl
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 9e685e26c2d1..7fc70f29edb3 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -751,12 +751,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
                 childregs->gpr[1] = sp + sizeof(struct pt_regs);
 #ifdef CONFIG_PPC64
                 childregs->gpr[14] = *(unsigned long *)usp;
-                childregs->gpr[2] = ((unsigned long *)usp)[1],
                 clear_tsk_thread_flag(p, TIF_32BIT);
                 childregs->softe = 1;
 #else
                 childregs->gpr[14] = usp;       /* function */
-                childregs->gpr[2] = (unsigned long) p;
 #endif
                 childregs->gpr[15] = arg;
                 p->thread.regs = NULL;  /* no user register state */