xarray: use BITS_PER_LONGS()

Patch series "xarray: Clean up xarray.h".

Main portion of this change is to get rid of kernel.h included into other
globally available headers.  This decreases a dependency hell degree.  The
first patch makes it possible to avoid math.h to be included as bitops.h
is implied by bitmap.h.


This patch (of 2):

Use BITS_PER_LONGS() instead of open coded variant.

Link: https://lkml.kernel.org/r/20240423142204.2408923-2-andriy.shevchenko@linux.intel.comSigned-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/xarray.h

@@ -1146,7 +1146,7 @@ static inline void xa_release(struct xarray *xa, unsigned long index)
 #define XA_CHUNK_SIZE		(1UL << XA_CHUNK_SHIFT)
 #define XA_CHUNK_MASK		(XA_CHUNK_SIZE - 1)
 #define XA_MAX_MARKS		3
-#define XA_MARK_LONGS		DIV_ROUND_UP(XA_CHUNK_SIZE, BITS_PER_LONG)
+#define XA_MARK_LONGS		BITS_TO_LONGS(XA_CHUNK_SIZE)
 
 /*
  * @count is the count of every non-NULL element in the ->slots array