SPARC64: flush_ptrace_access() needs preemption disable.

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: David S. Miller <davem@xxxxxxxxxxxxx>

Upstream commit: f6a843d939ade435e060d580f5c56d958464f8a5

Based upon a report by Mariusz Kozlowski.

Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 arch/sparc64/kernel/ptrace.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/kernel/ptrace.c
@@ -127,6 +127,8 @@ void flush_ptrace_access(struct vm_area_
 	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
@@ -165,6 +167,8 @@ void flush_ptrace_access(struct vm_area_
 		for (; start < end; start += icache_line_size)
 			flushi(start);
 	}
+
+	preempt_enable();
 }
 
 asmlinkage void do_ptrace(struct pt_regs *regs)

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