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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
..
extable.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
fault.c enable interrupts in user path of page fault. 2007-06-07 17:05:03 -07:00
init.c fix sysrq-m oops 2007-06-08 17:23:34 -07:00
ioremap.c Revert "[PATCH] x86: __pa and __pa_symbol address space separation" 2007-05-07 08:44:24 -07:00
k8topology.c [PATCH] x86-64: Don't enable NUMA for a single node in K8 NUMA scanning 2007-05-02 19:27:21 +02:00
Makefile [PATCH] x86_64: Flexmap for 32bit and randomized mappings for 64bit 2006-01-16 23:18:35 -08:00
mmap.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
numa.c [PATCH] x86-64: set node_possible_map at runtime - try 2 2007-05-02 19:27:20 +02:00
pageattr.c Revert "[PATCH] x86: __pa and __pa_symbol address space separation" 2007-05-07 08:44:24 -07:00
srat.c [PATCH] x86-64: set node_possible_map at runtime - try 2 2007-05-02 19:27:20 +02:00