From: Yury Norov <yury.norov@gmail.com>
Date: Mon, 25 Sep 2023 02:38:15 +0000 (-0700)
Subject: bitmap: replace _reg_op(REG_OP_ISFREE) with find_next_bit()
X-Git-Tag: v6.7-rc1~88^2~3
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9276819a68b52cf2577f77985041faf527cf477c;p=thirdparty%2Fkernel%2Flinux.git

bitmap: replace _reg_op(REG_OP_ISFREE) with find_next_bit()

_reg_op(REG_OP_ISFREE) can be trivially replaced with find_next_bit().
Doing that opens room for potential small_const_nbits() optimization.

CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
---

diff --git a/lib/bitmap.c b/lib/bitmap.c
index babed4dcb4679..e4d761a69fe83 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -840,7 +840,7 @@ int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
 {
 	unsigned int len = BIT(order);
 
-	if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
+	if (find_next_bit(bitmap, pos + len, pos) < pos + len)
 		return -EBUSY;
 	bitmap_set(bitmap, pos, len);
 	return 0;