From: Helge Deller <deller@gmx.de>
Date: Tue, 28 May 2013 20:35:54 +0000 (+0000)
Subject: parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ae249b5fa27f9fba25aa59664d4338efc2dd2394;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50

With CONFIG_DISCONTIGMEM=y and multiple physical memory areas,
cat /proc/kpageflags triggers this kernel bug:

kernel BUG at arch/parisc/include/asm/mmzone.h:50!
CPU: 2 PID: 7848 Comm: cat Tainted: G      D W 3.10.0-rc3-64bit #44
 IAOQ[0]: kpageflags_read0x128/0x238
 IAOQ[1]: kpageflags_read0x12c/0x238
 RP(r2): proc_reg_read0xbc/0x130
Backtrace:
 [<00000000402ca2d4>] proc_reg_read0xbc/0x130
 [<0000000040235bcc>] vfs_read0xc4/0x1d0
 [<0000000040235f0c>] SyS_read0x94/0xf0
 [<0000000040105fc0>] syscall_exit0x0/0x14

kpageflags_read() walks through the whole memory, even if some memory
areas are physically not available. So, we should better not BUG on an
unavailable pfn in pfn_to_nid() but just return the expected value -1 or
0.

Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/arch/parisc/include/asm/mmzone.h b/arch/parisc/include/asm/mmzone.h
index 0e625ab9aaec..cc50d33b7b88 100644
--- a/arch/parisc/include/asm/mmzone.h
+++ b/arch/parisc/include/asm/mmzone.h
@@ -39,17 +39,14 @@ extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
 static inline int pfn_to_nid(unsigned long pfn)
 {
 	unsigned int i;
-	unsigned char r;
 
 	if (unlikely(pfn_is_io(pfn)))
 		return 0;
 
 	i = pfn >> PFNNID_SHIFT;
 	BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
-	r = pfnnid_map[i];
-	BUG_ON(r == 0xff);
 
-	return (int)r;
+	return (int)pfnnid_map[i];
 }
 
 static inline int pfn_valid(int pfn)