[PATCH 17/29] csky: Fixup do_page_fault parent irq status

[guoren]

From: Guo Ren <guo...@linux.alibaba.com>

We must succeed parent's context irq status in page fault handler.

Signed-off-by: Guo Ren <guo...@linux.alibaba.com>
---
 arch/csky/kernel/entry.S | 2 +-
 arch/csky/mm/fault.c     | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
index 185fea477a8d..c1bd7a6b4ab6 100644
--- a/arch/csky/kernel/entry.S
+++ b/arch/csky/kernel/entry.S
@@ -42,7 +42,7 @@ ENTRY(csky_pagefault)
        SAVE_ALL 0
        zero_fp
        context_tracking
-       psrset  ee, ie
+       psrset  ee
        mov     a0, sp
        jbsr    do_page_fault
        jmpi    ret_from_exception
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index 9533bd8d9a6a..cd8c7304c7e9 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -143,6 +143,10 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
                return;
        }
 
+       /* Enable interrupts if they were enabled in the parent context. */
+       if (likely(regs->sr & BIT(6)))
+               local_irq_enable();
+
        /*
         * If we're in an interrupt or have no user
         * context, we must not take the fault..
-- 
2.17.1