linux-kernel - [PATCH] pagewalk: don't pte_unmap(NULL) in walk_pte

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Date:	Wed, 09 Apr 2008 12:08:45 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] pagewalk: don't pte_unmap(NULL) in walk_pte_range()

This is right isn't it?
---
Don't pte_unmap a NULL pointer, but the previous.

Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 1cf1417..6615f0b 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -15,7 +15,7 @@ static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 		       break;
 	} while (pte++, addr += PAGE_SIZE, addr != end);
 
-	pte_unmap(pte);
+	pte_unmap(pte - 1);
 	return err;
 }
 
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