Subject: [PATCH 8/8] powerpc: copy_thread don't set ppr in user interrupt frame regs

From: Nicholas Piggin <[email-masked]>
Date: Wed, 1 Feb 2023 02:55:34 +1000

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 <[email-masked]>
---
 arch/powerpc/kernel/process.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index e67597fd998f..3685a74a9041 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1814,11 +1814,6 @@ 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;
 	}
-- 
2.37.2