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Bob Picco 12710a56cb fix sysrq-m oops 
We aren't sampling for holes in memory.  Thus we encounter a section hole
with empty section map pointer for SPARSEMEM and OOPs for show_mem.  This
issue has been seen in 2.6.21, current git and current mm.  The patch below
is for mainline and mm.  It was boot tested for SPARSEMEM, current VMEMMAP
of Andy's in mm ml and DISCONTIGMEM.  A slightly different patch will be
posted to stable for 2.6.21.

Previous to commit f0a5a58aa8 memory_present
was called for node_start_pfn to node_end_pfn.  This would cover the
hole(s) with reserved pages and valid sections.  Most SPARSEMEM supported
arches do a pfn_valid check in show_mem before computing the page structure
address.

This issue was brought to my attention on IRC by Arnaldo Carvalho de Melo.
Thanks to Arnaldo for testing.

Signed-off-by: Bob Picco <bob.picco@hp.com>
Cc: Chuck Ebbert <cebbert@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-06-08 17:23:34 -07:00
..
boot [PATCH] x86-64: Share identical video.S between i386 and x86-64 2007-05-02 19:27:21 +02:00
crypto [CRYPTO] api: Get rid of flags argument to setkey 2006-09-21 11:41:02 +10:00
ia32 Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
kernel Avoid zero size allocation in cache_k8_northbridges() 2007-05-23 20:14:12 -07:00
lib Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq 2007-02-26 14:17:50 -08:00
mm fix sysrq-m oops 2007-06-08 17:23:34 -07:00
oprofile [PATCH] Move Kprobes and Oprofile to "Instrumentation Support" menu 2005-11-07 07:53:35 -08:00
pci [PATCH] mmconfig: fix unreachable_devices() 2007-02-13 13:26:20 +01:00
defconfig x86_64: Update defconfig 2007-05-21 09:56:56 -07:00
Kconfig i386, x86-64: show that CONFIG_HOTPLUG_CPU is required for suspend on SMP 2007-05-23 20:14:14 -07:00
Kconfig.debug [PATCH] lockdep: irqtrace subsystem, x86_64 support 2006-07-03 15:27:03 -07:00
Makefile [PATCH] x86-64: Remove CONFIG_REORDER 2007-05-02 19:27:21 +02:00