bitmap: make bitmap_{get,set}_value8() use bitmap_{read,write}()

Now that we have generic bitmap_read() and bitmap_write(), which are
inline and try to take care of non-bound-crossing and aligned cases
to keep them optimized, collapse bitmap_{get,set}_value8() into
simple wrappers around the former ones.
bloat-o-meter shows no difference in vmlinux and -2 bytes for
gpio-pca953x.ko, which says the code doesn't get optimized worse.

Suggested-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>

include/linux/bitmap.h

@@ -572,39 +572,6 @@ static inline void bitmap_from_u64(unsigned long *dst, u64 mask)
 	bitmap_from_arr64(dst, &mask, 64);
 }
 
-/**
- * bitmap_get_value8 - get an 8-bit value within a memory region
- * @map: address to the bitmap memory region
- * @start: bit offset of the 8-bit value; must be a multiple of 8
- *
- * Returns the 8-bit value located at the @start bit offset within the @src
- * memory region.
- */
-static inline unsigned long bitmap_get_value8(const unsigned long *map,
-					      unsigned long start)
-{
-	const size_t index = BIT_WORD(start);
-	const unsigned long offset = start % BITS_PER_LONG;
-
-	return (map[index] >> offset) & 0xFF;
-}
-
-/**
- * bitmap_set_value8 - set an 8-bit value within a memory region
- * @map: address to the bitmap memory region
- * @value: the 8-bit value; values wider than 8 bits may clobber bitmap
- * @start: bit offset of the 8-bit value; must be a multiple of 8
- */
-static inline void bitmap_set_value8(unsigned long *map, unsigned long value,
-				     unsigned long start)
-{
-	const size_t index = BIT_WORD(start);
-	const unsigned long offset = start % BITS_PER_LONG;
-
-	map[index] &= ~(0xFFUL << offset);
-	map[index] |= value << offset;
-}
-
 /**
  * bitmap_read - read a value of n-bits from the memory region
  * @map: address to the bitmap memory region
@@ -678,6 +645,11 @@ static inline void bitmap_write(unsigned long *map, unsigned long value,
 	map[index + 1] |= (value >> space);
 }
 
+#define bitmap_get_value8(map, start)			\
+	bitmap_read(map, start, BITS_PER_BYTE)
+#define bitmap_set_value8(map, value, start)		\
+	bitmap_write(map, value, start, BITS_PER_BYTE)
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __LINUX_BITMAP_H */