linux-kernel - [PATCH] microblaze: Fix pfn

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Date:	Fri, 13 Nov 2009 16:08:29 -0600
From:	steve@...idescorp.com
To:	microblaze-uclinux@...e.uq.edu.au
Cc:	monstr@...str.eu, linux-kernel@...r.kernel.org,
	"Steven J. Magnani" <steve@...idescorp.com>
Subject: [PATCH] microblaze: Fix pfn_valid() for noMMU

Configuring DEBUG_SLAB causes a noMMU kernel to die during initialization
with an invalid virtual address panic in kfree_debugcheck().
The panic is due to an improper definition of pfn_valid().

Signed-off-by: Steven J. Magnani <steve@...idescorp.com>
---
diff -uprN a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
--- a/arch/microblaze/include/asm/page.h	2009-09-09 17:13:59.000000000 -0500
+++ b/arch/microblaze/include/asm/page.h	2009-11-13 15:20:26.000000000 -0600
@@ -161,7 +161,8 @@ extern int page_is_ram(unsigned long pfn
 #  endif /* CONFIG_MMU */
 
 #  ifndef CONFIG_MMU
-#  define pfn_valid(pfn)	((pfn) >= min_low_pfn && (pfn) <= max_mapnr)
+#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
+				((pfn) <= (min_low_pfn + max_mapnr)))
 #  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
 #  else /* CONFIG_MMU */
 #  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)

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