[Xen-devel] [PATCH 3/3] xen: use correct type for physical addresses

[Juergen Gross <jgross@xxxxxxxx>]

When converting a pfn to a physical address be sure to use 64 bit
wide types.

Also avoid invalidating memory for zero sized non-aligned extra
memory regions.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 arch/x86/xen/setup.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index feb6d86..8839d7b 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -140,7 +140,7 @@ static void __init xen_del_extra_mem(u64 start, u64 size)
 unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
 {
        int i;
-       unsigned long addr = PFN_PHYS(pfn);
+       u64 addr = PFN_PHYS(pfn);
 
        for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
                if (addr >= xen_extra_mem[i].start &&
@@ -160,6 +160,8 @@ void __init xen_inv_extra_mem(void)
        int i;
 
        for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+               if (!xen_extra_mem[i].size)
+                       continue;
                pfn_s = PFN_DOWN(xen_extra_mem[i].start);
                pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);
                for (pfn = pfn_s; pfn < pfn_e; pfn++)
@@ -284,7 +286,7 @@ static void __init xen_update_mem_tables(unsigned long pfn, 
unsigned long mfn)
        }
 
        /* Update kernel mapping, but not for highmem. */
-       if ((pfn << PAGE_SHIFT) >= __pa(high_memory))
+       if (PFN_PHYS(pfn) >= (u64)(__pa(high_memory)))
                return;
 
        if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
-- 
2.1.2


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