On Wed, 28 Apr 2010 16:53:32 PDT, akpm@linux-foundation.org said:
> The mm-of-the-moment snapshot 2010-04-28-16-53 has been uploaded to
> 
>    http://userweb.kernel.org/~akpm/mmotm/

Dies trying to compile mm/slab.c because something screwed the pooch with
the definition of numa_mem_id(). My bets are on
numa-slab-use-numa_mem_id-for-slab-local-memory-node.patch

  CC      mm/slab.o
mm/slab.c: In function 'kmem_cache_init':
mm/slab.c:1506: error: 'numa_node' undeclared (first use in this function)
mm/slab.c:1506: error: (Each undeclared identifier is reported only once
mm/slab.c:1506: error: for each function it appears in.)
mm/slab.c:1506: warning: type defaults to 'int' in declaration of 'pscr_ret__'
mm/slab.c:1506: warning: type defaults to 'int' in declaration of 'type name'
mm/slab.c:1506: warning: cast from pointer to integer of different size
mm/slab.c:1506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:1506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:1506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:1506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c: In function 'setup_cpu_cache':
mm/slab.c:2148: error: 'numa_node' undeclared (first use in this function)
mm/slab.c:2148: warning: type defaults to 'int' in declaration of 'pscr_ret__'
mm/slab.c:2148: warning: type defaults to 'int' in declaration of 'type name'
mm/slab.c:2148: warning: cast from pointer to integer of different size
mm/slab.c:2148: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:2148: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:2148: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:2148: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c: In function 'do_drain':
mm/slab.c:2506: error: 'numa_node' undeclared (first use in this function)
mm/slab.c:2506: warning: type defaults to 'int' in declaration of 'pscr_ret__'
mm/slab.c:2506: warning: type defaults to 'int' in declaration of 'type name'
mm/slab.c:2506: warning: cast from pointer to integer of different size
mm/slab.c:2506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:2506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:2506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:2506: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c: In function 'cache_alloc_refill':
mm/slab.c:3039: error: 'numa_node' undeclared (first use in this function)
mm/slab.c:3039: warning: type defaults to 'int' in declaration of 'pscr_ret__'
mm/slab.c:3039: warning: type defaults to 'int' in declaration of 'type name'
mm/slab.c:3039: warning: cast from pointer to integer of different size
mm/slab.c:3039: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:3039: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:3039: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:3039: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c: In function 'cache_flusharray':
mm/slab.c:3575: error: 'numa_node' undeclared (first use in this function)
mm/slab.c:3575: warning: type defaults to 'int' in declaration of 'pscr_ret__'
mm/slab.c:3575: warning: type defaults to 'int' in declaration of 'type name'
mm/slab.c:3575: warning: cast from pointer to integer of different size
mm/slab.c:3575: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:3575: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:3575: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:3575: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c: In function 'cache_reap':
mm/slab.c:4139: error: 'numa_node' undeclared (first use in this function)
mm/slab.c:4139: warning: type defaults to 'int' in declaration of 'pscr_ret__'
mm/slab.c:4139: warning: type defaults to 'int' in declaration of 'type name'
mm/slab.c:4139: warning: cast from pointer to integer of different size
mm/slab.c:4139: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:4139: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:4139: warning: type defaults to 'int' in declaration of 'pfo_ret__'
mm/slab.c:4139: warning: type defaults to 'int' in declaration of 'pfo_ret__'
make[1]: *** [mm/slab.o] Error 1
make: *** [mm] Error 2

line 1506: node = numa_mem_id();
line 2148: cachep->nodelists[numa_mem_id()]->next_reap =
line 2506: int node = numa_mem_id();
line 3039: node = numa_mem_id();
line 3575: int node = numa_mem_id();
line 3139: int node = numa_mem_id();

Looks like a twisty little maze of cpp macros in each case, probably
related to this:

% grep -i numa .config
# CONFIG_NUMA is not set