powerpc: copy_thread don't set PPR in user interrupt frame regs

syscalls do not set the PPR field in their interrupt frame and
return from syscall always sets the default PPR for userspace,
so setting the value in the ret_from_fork frame is not necessary
and mildly inconsistent. Remove it.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-9-npiggin@gmail.com

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 2d90f39581fa12d5626b94d44eed1716e03cc9eb..1fefafb2b29be53f21577b3d76c63cb1a2ccfa8b 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1812,11 +1812,6 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
                                f = ret_from_fork;
                }
 
-#ifdef CONFIG_PPC64
-               if (cpu_has_feature(CPU_FTR_HAS_PPR))
-                       childregs->ppr = DEFAULT_PPR;
-#endif
-
                childregs->msr &= ~(MSR_FP|MSR_VEC|MSR_VSX);
                p->thread.regs = childregs;
        }