[RFC PATCH 6/7] powerpc/64e/interrupt: handle bad_page_fault in C

[Nicholas Piggin <npiggin@gmail.com>]

With non-volatile registers saved on interrupt, bad_page_fault
can now be called by do_page_fault.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/exceptions-64e.S | 6 ------
 arch/powerpc/mm/fault.c              | 4 ++--
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index eef8b5bc3cc8..d9151f3ae35d 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -962,12 +962,6 @@ storage_fault_common:
 	ld	r14,PACA_EXGEN+EX_R14(r13)
 	ld	r15,PACA_EXGEN+EX_R15(r13)
 	bl	do_page_fault
-	cmpdi	r3,0
-	bne-	1f
-	b	interrupt_return
-	mr	r4,r3
-	addi	r3,r1,STACK_FRAME_OVERHEAD
-	bl	__bad_page_fault
 	b	interrupt_return
 
 /*
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index bb368257b55c..f271715a1c0a 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -552,11 +552,11 @@ static long __do_page_fault(struct pt_regs *regs)
 	if (likely(entry)) {
 		instruction_pointer_set(regs, extable_fixup(entry));
 		return 0;
-	} else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
+	} else if (IS_ENABLED(CONFIG_PPC64)) {
 		__bad_page_fault(regs, err);
 		return 0;
 	} else {
-		/* 32 and 64e handle the bad page fault in asm */
+		/* 32-bit handles the bad page fault in asm */
 		return err;
 	}
 }
-- 
2.23.0