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  1. 08 Feb, 2008 2 commits
    • Christoph Lameter's avatar
      SLUB: Use unique end pointer for each slab page. · 683d0baa
      Christoph Lameter authored 
      We use a NULL pointer on freelists to signal that there are no more objects.
However the NULL pointers of all slabs match in contrast to the pointers to
the real objects which are in different ranges for different slab pages.

Change the end pointer to be a pointer to the first object and set bit 0.
Every slab will then have a different end pointer. This is necessary to ensure
that end markers can be matched to the source slab during cmpxchg_local.

Bring back the use of the mapping field by SLUB since we would otherwise have
to call a relatively expensive function page_address() in __slab_alloc().  Use
of the mapping field allows avoiding a call to page_address() in various other
functions as well.

There is no need to change the page_mapping() function since bit 0 is set on
the mapping as also for anonymous pages.  page_mapping(slab_page) will
therefore still return NULL although the mapping field is overloaded.
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      683d0baa
    • Christoph Lameter's avatar
      SLUB: Deal with annoying gcc warning on kfree() · 5bb983b0
      Christoph Lameter authored 
      gcc 4.2 spits out an annoying warning if one casts a const void *
pointer to a void * pointer. No warning is generated if the
conversion is done through an assignment.
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
      5bb983b0
  3. 07 Feb, 2008 38 commits
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