[Xen-devel] [PATCH] xen: fix sparse warning in p2m.c

[Juergen Gross <jgross@xxxxxxxx>]

The patch "Speed up set_phys_to_machine() by using read-only mappings"
introduced a sparse warning:

arch/x86/xen/p2m.c:628:13: sparse: incorrect type in argument 1
                           (different address spaces)

Avoid the warning.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 arch/x86/xen/p2m.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 8b5db51..2defca9 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -615,6 +615,7 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long 
mfn)
 {
        pte_t *ptep;
        unsigned int level;
+       unsigned long __user *addr;
 
        /* don't track P2M changes in autotranslate guests */
        if (unlikely(xen_feature(XENFEAT_auto_translated_physmap)))
@@ -625,7 +626,8 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long 
mfn)
                return true;
        }
 
-       if (likely(!__put_user(mfn, xen_p2m_addr + pfn)))
+       addr = (unsigned long __user *)xen_p2m_addr + pfn;
+       if (likely(!__put_user(mfn, addr)))
                return true;
 
        ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn), &level);
-- 
2.1.2


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