linux-kernel - [PATCH] mtd: spi-nor: use is_power_of

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Message-Id: <20210305234552.19204-1-michael@walle.cc>
Date:   Sat,  6 Mar 2021 00:45:52 +0100
From:   Michael Walle <michael@...le.cc>
To:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH] mtd: spi-nor: use is_power_of_2()

There is already a function to check if an integer is a power of 2. Use
it.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/mtd/spi-nor/core.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 0522304f52fa..4a315cb1c4db 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2336,11 +2336,8 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
 		 * If page_size is a power of two, the offset can be quickly
 		 * calculated with an AND operation. On the other cases we
 		 * need to do a modulus operation (more expensive).
-		 * Power of two numbers have only one bit set and we can use
-		 * the instruction hweight32 to detect if we need to do a
-		 * modulus (do_div()) or not.
 		 */
-		if (hweight32(nor->page_size) == 1) {
+		if (is_power_of_2(nor->page_size)) {
 			page_offset = addr & (nor->page_size - 1);
 		} else {
 			uint64_t aux = addr;
-- 
2.20.1