lib/bitmap.c: guard exotic bitmap functions by CONFIG_NUMA
The bitmap_remap, _bitremap, _onto and _fold functions are only used,
via their node_ wrappers, in mm/mempolicy.c, which is only built for
CONFIG_NUMA. The helper bitmap_ord_to_pos used by these functions is
global, but its only external caller is node_random() in lib/nodemask.c,
which is also guarded by CONFIG_NUMA.
For !CONFIG_NUMA:
add/remove: 0/6 grow/shrink: 0/0 up/down: 0/-621 (-621)
Function old new delta
bitmap_pos_to_ord 20 - -20
bitmap_ord_to_pos 70 - -70
bitmap_bitremap 81 - -81
bitmap_fold 113 - -113
bitmap_onto 123 - -123
bitmap_remap 214 - -214
Total: Before=4776, After=4155, chg -13.00%
Link: http://lkml.kernel.org/r/20190329205353.6010-2-linux@rasmusvillemoes.dk
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 66421f3..3f3b805 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -649,6 +649,7 @@ int bitmap_parselist_user(const char __user *ubuf,
EXPORT_SYMBOL(bitmap_parselist_user);
+#ifdef CONFIG_NUMA
/**
* bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap
* @buf: pointer to a bitmap
@@ -952,6 +953,7 @@ void bitmap_fold(unsigned long *dst, const unsigned long *orig,
for_each_set_bit(oldbit, orig, nbits)
set_bit(oldbit % sz, dst);
}
+#endif /* CONFIG_NUMA */
/*
* Common code for bitmap_*_region() routines.
