linux-kernel - [PATCH] xen: fix the check of e_pfn in xen_find_pfn

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Date:	Wed, 2 Sep 2015 18:51:36 +0800
From:	Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	jgross@...e.com, david.vrabel@...rix.com, konrad.wilk@...cle.com,
	boris.ostrovsky@...cle.com
Subject: [PATCH] xen: fix the check of e_pfn in xen_find_pfn_range

On some numa system, after dom0 up, we see below warning even if there are
enough pfn ranges 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@...cle.com>
---
  arch/x86/xen/setup.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a3a7546..c11f6b2 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -178,7 +178,7 @@ static unsigned long __init xen_find_pfn_range(
  		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);
-- 
1.7.3

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