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    SubjectRe: [Stable-review] [36/55] [PARISC] slub: fix panic with DISCONTIGMEM
    On Fri, 2011-04-29 at 11:55 -0700, Greg KH wrote:
    > 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.

    This stable series also included the patches:

    commit 6a682f634ba9615d3498d1e20a23e9d4fcb39f16
    Author: David Rientjes <rientjes@google.com>
    Date: Wed Apr 20 19:27:13 2011 -0700

    set memory ranges in N_NORMAL_MEMORY when onlined

    commit d9b41e0b54fd7e164daf1e9c539c1070398aa02e upstream.

    commit 8858587af25efc06d5cce42676786b3d7a9160f2
    Author: Michael Schmitz <schmitzmic@googlemail.com>
    Date: Tue Apr 26 14:51:53 2011 +1200

    m68k/mm: Set all online nodes in N_NORMAL_MEMORY

    commit 4aac0b4815ba592052758f4b468f253d383dc9d6 upstream.

    which look like they're supposed to make slub work on these two
    architectures (parisc and m68k). Do they? If not, do they fix a
    different problem?

    Ben.

    --
    Ben Hutchings
    Once a job is fouled up, anything done to improve it makes it worse.
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