tree cf1c92a448b30cf1f18330798a8060d47023a6fc
parent d9b41e0b54fd7e164daf1e9c539c1070398aa02e
author James Bottomley <James.Bottomley@HansenPartnership.com> 1303248576 -0500
committer James Bottomley <James.Bottomley@suse.de> 1303504966 -0500

[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>