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| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2011-04-19 16:29:36 -0500 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-04-22 15:42:46 -0500 |
| commit | 4a5fa3590f09999f6db41bc386bce40848fa9f63 (patch) | |
| tree | cf1c92a448b30cf1f18330798a8060d47023a6fc /init | |
| parent | d9b41e0b54fd7e164daf1e9c539c1070398aa02e (diff) | |
| download | lwn-4a5fa3590f09999f6db41bc386bce40848fa9f63.tar.gz lwn-4a5fa3590f09999f6db41bc386bce40848fa9f63.zip | |
[PARISC] slub: fix panic with DISCONTIGMEM
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.
Cc: stable@kernel.org
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 56240e724d9a..a7ad8fbdb564 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1226,6 +1226,7 @@ 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 |