ata: ahci: use hweight_long() to count port_map bits

Replace the open loop used to calculate the number of set bits
in the port mapping with the `hweight_long()` function, which
simplifies the code without altering its functionality.

Signed-off-by: TanZheng <tanzheng@kylinos.cn>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 0c5e5b29bce4cd6bc56571bbfdc4f05579800720..e0af4b5716b3f2c3859210956f5ee93a2f7061f6 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -552,11 +552,7 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
 
        /* cross check port_map and cap.n_ports */
        if (port_map) {
-               int map_ports = 0;
-
-               for (i = 0; i < AHCI_MAX_PORTS; i++)
-                       if (port_map & (1 << i))
-                               map_ports++;
+               int map_ports = hweight_long(port_map);
 
                /* If PI has more ports than n_ports, whine, clear
                 * port_map and let it be generated from n_ports.