This is a note to let you know that I've just added the patch titled
parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-fix-kernel-bug-at-arch-parisc-include-asm-mmzone.h-50.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ae249b5fa27f9fba25aa59664d4338efc2dd2394 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Tue, 28 May 2013 20:35:54 +0000
Subject: parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50
From: Helge Deller <deller@xxxxxx>
commit ae249b5fa27f9fba25aa59664d4338efc2dd2394 upstream.
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@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/include/asm/mmzone.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/arch/parisc/include/asm/mmzone.h
+++ b/arch/parisc/include/asm/mmzone.h
@@ -39,17 +39,14 @@ extern unsigned char pfnnid_map[PFNNID_M
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)
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-3.9/parisc-tlb-flush-counting-fix-for-smp-and-up.patch
queue-3.9/parisc-show-number-of-fpe-and-unaligned-access-handler-calls-in-proc-interrupts.patch
queue-3.9/parisc-parport0-fix-this-legacy-no-device-port-driver.patch
queue-3.9/parisc-fix-kernel-bug-at-arch-parisc-include-asm-mmzone.h-50.patch
queue-3.9/parisc-kernel-using-strlcpy-instead-of-strcpy.patch
queue-3.9/parisc-implement-irq-stacks.patch
queue-3.9/parisc-provide-pci_mmap_page_range-for-parisc.patch
queue-3.9/parisc-more-irq-statistics-in-proc-interrupts.patch
queue-3.9/parisc-fix-serial-ports-on-c8000-workstation.patch
queue-3.9/parisc-remove-the-second-argument-of-kmap_atomic.patch
queue-3.9/parisc-add-kernel-stack-overflow-check.patch
queue-3.9/parisc-memory-overflow-name-length-is-too-short-for-using.patch
queue-3.9/parisc-implement-irq-stacks-part-2-v2.patch
queue-3.9/parisc-fix-irq-stack-on-up-and-smp.patch
queue-3.9/parisc-rename-config_pa7100-to-config_pa7000.patch
queue-3.9/parisc-make-interrupt-and-interruption-stack-allocation-reentrant.patch
queue-3.9/parisc-fix-kernel-bug-at-arch-parisc-include-asm-mmzone.h-50-part-2.patch
queue-3.9/parisc-add-rp5470-entry-to-machine-database.patch
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