[Xen-devel] [PATCH] xen: fix the check of e_pfn in xen_find_pfn_range

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>

On some NUMA system, after dom0 up, we see below warning even if there are
enough pfn ranges that could be used for remapping:
"Unable to find available pfn range, not remapping identity pages"

Fix it to avoid getting a memory region of zero size in xen_find_pfn_range.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/xen/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 387b60d..d1fac0e 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -212,7 +212,7 @@ static unsigned long __init xen_find_pfn_range(unsigned 
long *min_pfn)
                e_pfn = PFN_DOWN(entry->addr + entry->size);
 
                /* We only care about E820 after this */
-               if (e_pfn < *min_pfn)
+               if (e_pfn <= *min_pfn)
                        continue;
 
                s_pfn = PFN_UP(entry->addr);
-- 
2.1.0


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