[RFC PATCH v2 08/13] powerpc/syscall: Save r3 in regs->orig_r3

[Christophe Leroy]

Save r3 in regs->orig_r3 in system_call_exception()

Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
 arch/powerpc/kernel/entry_64.S | 1 -
 arch/powerpc/kernel/syscall.c  | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 63f0a4414618..5ccb65f75712 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -114,7 +114,6 @@ END_BTB_FLUSH_SECTION
        std     r10,_LINK(r1)
        std     r11,_TRAP(r1)
        std     r12,_CCR(r1)
-       std     r3,ORIG_GPR3(r1)
        addi    r10,r1,STACK_FRAME_OVERHEAD
        ld      r11,exception_marker@toc(r2)
        std     r11,-16(r10)            /* "regshere" marker */
diff --git a/arch/powerpc/kernel/syscall.c b/arch/powerpc/kernel/syscall.c
index 4674cfd2916d..986489ea9fb4 100644
--- a/arch/powerpc/kernel/syscall.c
+++ b/arch/powerpc/kernel/syscall.c
@@ -27,6 +27,8 @@ notrace long system_call_exception(long r3, long r4, long r5,
        unsigned long ti_flags;
        syscall_fn f;
 
+       regs->orig_gpr3 = r3;
+
 #ifdef CONFIG_PPC64
        if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
                BUG_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED);
-- 
2.25.0