powerpc/64e/interrupt: handle bad_page_fault in C

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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210316104206.407354-9-npiggin@gmail.com

diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index 3c222a9..7c3654b 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -937,12 +937,6 @@ 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 0c0b1c2..18e588f 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -552,12 +552,9 @@ 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_BOOK3E_64)) {
+       } else {
                __bad_page_fault(regs, err);
                return 0;
-       } else {
-               /* 32 and 64e handle the bad page fault in asm */
-               return err;
        }
 }
 NOKPROBE_SYMBOL(__do_page_fault);