from <linux/kernel.h>:
/* This helps us to avoid #ifdef CONFIG_NUMA */
#ifdef CONFIG_NUMA
#define NUMA_BUILD 1
#else
#define NUMA_BUILD 0
#endif
however, there's still a pile of that preprocessor directive
scattered throughout the kernel. what kind of "avoidance" are we
talking about here?
$ grep -r "#ifdef CONFIG_NUMA" * | wc -l
159
$ grep -rw NUMA_BUILD *
include/linux/kernel.h:#define NUMA_BUILD 1
include/linux/kernel.h:#define NUMA_BUILD 0
mm/page_alloc.c: if (NUMA_BUILD && zlc_active &&
mm/page_alloc.c: if (NUMA_BUILD)
mm/page_alloc.c: if (NUMA_BUILD && !did_zlc_setup) {
mm/page_alloc.c: if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) {
mm/page_alloc.c: if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE)
mm/page_alloc.c: if (NUMA_BUILD)
$
not a lot of avoiding going on there, i'd say.
rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry:
Have classroom, will lecture.
http://crashcourse.ca Waterloo, Ontario, CANADA
========================================================================
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