[SPARC64]: flush_ptrace_access() needs preemption disable.

Based upon a report by Mariusz Kozlowski.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index bcf58ece2ba1..aaae865e7932 100644
--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/kernel/ptrace.c
@@ -70,6 +70,8 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
         if (tlb_type == hypervisor)
                 return;
 
+        preempt_disable();
+
 #ifdef DCACHE_ALIASING_POSSIBLE
         /* If bit 13 of the kernel address we used to access the
          * user page is the same as the virtual address that page
@@ -108,6 +110,8 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
                 for (; start < end; start += icache_line_size)
                         flushi(start);
         }
+
+        preempt_enable();
 }
 
 enum sparc_regset {