lkml.org 
[lkml]   [2011]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[36/55] [PARISC] slub: fix panic with DISCONTIGMEM
2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------
From: James Bottomley <James.Bottomley@HansenPartnership.com>

commit 4a5fa3590f09999f6db41bc386bce40848fa9f63 upstream.
Slub makes assumptions about page_to_nid() which are violated by
DISCONTIGMEM and !NUMA. This violation results in a panic because
page_to_nid() can be non-zero for pages in the discontiguous ranges and
this leads to a null return by get_node(). The assertion by the
maintainer is that DISCONTIGMEM should only be allowed when NUMA is also
defined. However, at least six architectures: alpha, ia64, m32r, m68k,
mips, parisc violate this. The panic is a regression against slab, so
just mark slub broken in the problem configuration to prevent users
reporting these panics.

Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
init/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1209,6 +1209,7 @@ config SLAB
per cpu and per node queues.

config SLUB
+ depends on BROKEN || NUMA || !DISCONTIGMEM
bool "SLUB (Unqueued Allocator)"
help
SLUB is a slab allocator that minimizes cache line usage



\
 
 \ /
  Last update: 2011-04-29 21:05    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site