xen: introduce helper functions to do safe read and write accesses

[cascardo/linux.git] / arch / x86 / xen / p2m.c

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 8b5db51..edbc7a6 100644 (file)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -625,7 +625,7 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
                return true;
        }
 
-       if (likely(!__put_user(mfn, xen_p2m_addr + pfn)))
+       if (likely(!xen_safe_write_ulong(xen_p2m_addr + pfn, mfn)))
                return true;
 
        ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn), &level);