linux-4.4.1/bitmap_find_free_region() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/bitmap_find_free_region() へ行く。
• linux-4.4.1/bitmap_find_free_region() の差分を削除

*参照元 [#t1639f62]
#backlinks

*説明 [#e7f5e4fe]
-パス: [[linux-4.4.1/lib/bitmap.c]]

-FIXME: これは何？
--説明


**引数 [#xbb1bc1f]
-unsigned long *bitmap
--
-unsigned int bits
--
-int order
--


**返り値 [#l71c2335]
-int
--


**参考 [#m3f37584]


*実装 [#ne3fa367]
 /**
  * bitmap_find_free_region - find a contiguous aligned mem region
  *      @bitmap: array of unsigned longs corresponding to the bitmap
  *      @bits: number of bits in the bitmap
  *      @order: region size (log base 2 of number of bits) to find
  *
  * Find a region of free (zero) bits in a @bitmap of @bits bits and
  * allocate them (set them to one).  Only consider regions of length
  * a power (@order) of two, aligned to that power of two, which
  * makes the search algorithm much faster.
  *
  * Return the bit offset in bitmap of the allocated region,
  * or -errno on failure.
  */
 int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order)
 {
         unsigned int pos, end;          /* scans bitmap by regions of size order */
 
         for (pos = 0 ; (end = pos + (1U << order)) <= bits; pos = end) {
                 if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
                         continue;
                 __reg_op(bitmap, pos, order, REG_OP_ALLOC);
                 return pos;
         }
-
--[[linux-4.4.1/REG_OP_ISFREE]]
--[[linux-4.4.1/REG_OP_ALLOC]]
--[[linux-4.4.1/__reg_op()]]

         return -ENOMEM;
 }
 EXPORT_SYMBOL(bitmap_find_free_region);
-
--[[linux-4.4.1/EXPORT_SYMBOL()]]


*コメント [#i1b1d947]