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

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

[Konrad Rzeszutek Wilk]

From: Zhenzhong Duan <zhenzhong.duan@oracle.com>

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@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 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

Re: [PATCH] xen: fix the check of e_pfn in xen_find_pfn_range

[David Vrabel]

On 27/10/15 19:19, Konrad Rzeszutek Wilk wrote:
> From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
> 
> 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.

Applied to for-linus-4.4, thanks.

David