[PATCH 03/49] net: mellanox: fix open-coded for_each_set_bit()

[PATCH 03/49] net: mellanox: fix open-coded for_each_set_bit()

[Yury Norov]

Mellanox driver has an open-coded for_each_set_bit(). Fix it.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx4/cmd.c | 23 ++++++-----------------
 1 file changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
index e10b7b04b894..c56d2194cbfc 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
@@ -1994,21 +1994,16 @@ static void mlx4_allocate_port_vpps(struct mlx4_dev *dev, int port)
 
 static int mlx4_master_activate_admin_state(struct mlx4_priv *priv, int slave)
 {
-	int port, err;
+	int p, port, err;
 	struct mlx4_vport_state *vp_admin;
 	struct mlx4_vport_oper_state *vp_oper;
 	struct mlx4_slave_state *slave_state =
 		&priv->mfunc.master.slave_state[slave];
 	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(
 			&priv->dev, slave);
-	int min_port = find_first_bit(actv_ports.ports,
-				      priv->dev.caps.num_ports) + 1;
-	int max_port = min_port - 1 +
-		bitmap_weight(actv_ports.ports, priv->dev.caps.num_ports);
 
-	for (port = min_port; port <= max_port; port++) {
-		if (!test_bit(port - 1, actv_ports.ports))
-			continue;
+	for_each_set_bit(p, actv_ports.ports, priv->dev.caps.num_ports) {
+		port = p + 1;
 		priv->mfunc.master.vf_oper[slave].smi_enabled[port] =
 			priv->mfunc.master.vf_admin[slave].enable_smi[port];
 		vp_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
@@ -2063,19 +2058,13 @@ static int mlx4_master_activate_admin_state(struct mlx4_priv *priv, int slave)
 
 static void mlx4_master_deactivate_admin_state(struct mlx4_priv *priv, int slave)
 {
-	int port;
+	int p, port;
 	struct mlx4_vport_oper_state *vp_oper;
 	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(
 			&priv->dev, slave);
-	int min_port = find_first_bit(actv_ports.ports,
-				      priv->dev.caps.num_ports) + 1;
-	int max_port = min_port - 1 +
-		bitmap_weight(actv_ports.ports, priv->dev.caps.num_ports);
 
-
-	for (port = min_port; port <= max_port; port++) {
-		if (!test_bit(port - 1, actv_ports.ports))
-			continue;
+	for_each_set_bit(p, actv_ports.ports, priv->dev.caps.num_ports) {
+		port = p + 1;
 		priv->mfunc.master.vf_oper[slave].smi_enabled[port] =
 			MLX4_VF_SMI_DISABLED;
 		vp_oper = &priv->mfunc.master.vf_oper[slave].vport[port];
-- 
2.32.0

RE: [PATCH 03/49] net: mellanox: fix open-coded for_each_set_bit()

[David Laight]

From: Yury Norov
> Sent: 10 February 2022 22:49
> 
> Mellanox driver has an open-coded for_each_set_bit(). Fix it.
> 
> Signed-off-by: Yury Norov <yury.norov@gmail.com>
> Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/cmd.c | 23 ++++++-----------------
>  1 file changed, 6 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
> index e10b7b04b894..c56d2194cbfc 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
> @@ -1994,21 +1994,16 @@ static void mlx4_allocate_port_vpps(struct mlx4_dev *dev, int port)
> 
>  static int mlx4_master_activate_admin_state(struct mlx4_priv *priv, int slave)
>  {
> -	int port, err;
> +	int p, port, err;
>  	struct mlx4_vport_state *vp_admin;
>  	struct mlx4_vport_oper_state *vp_oper;
>  	struct mlx4_slave_state *slave_state =
>  		&priv->mfunc.master.slave_state[slave];
>  	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(
>  			&priv->dev, slave);
> -	int min_port = find_first_bit(actv_ports.ports,
> -				      priv->dev.caps.num_ports) + 1;
> -	int max_port = min_port - 1 +
> -		bitmap_weight(actv_ports.ports, priv->dev.caps.num_ports);
> 
> -	for (port = min_port; port <= max_port; port++) {
> -		if (!test_bit(port - 1, actv_ports.ports))
> -			continue;
> +	for_each_set_bit(p, actv_ports.ports, priv->dev.caps.num_ports) {
> +		port = p + 1;

This is an 'interesting' change in behaviour, and looks like a bug fix.
Did anyone actually test the old code?

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

[PATCH 17/49] cpufreq: replace cpumask_weight with cpumask_empty where appropriate

[Yury Norov]

drivers/cpufreq calls cpumask_weight() to check if any bit of a given
cpumask is set. We can do it more efficiently with cpumask_empty() because
cpumask_empty() stops traversing the cpumask as soon as it finds first set
bit, while cpumask_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> (for SCMI cpufreq driver)
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 2 +-
 drivers/cpufreq/scmi-cpufreq.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 05f3d7876e44..95a0c57ab5bb 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -482,7 +482,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 	}
 
 	qcom_get_related_cpus(index, policy->cpus);
-	if (!cpumask_weight(policy->cpus)) {
+	if (cpumask_empty(policy->cpus)) {
 		dev_err(dev, "Domain-%d failed to get related CPUs\n", index);
 		ret = -ENOENT;
 		goto error;
diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 1e0cd4d165f0..919fa6e3f462 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -154,7 +154,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	 * table and opp-shared.
 	 */
 	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->opp_shared_cpus);
-	if (ret || !cpumask_weight(priv->opp_shared_cpus)) {
+	if (ret || cpumask_empty(priv->opp_shared_cpus)) {
 		/*
 		 * Either opp-table is not set or no opp-shared was found.
 		 * Use the CPU mask from SCMI to designate CPUs sharing an OPP
-- 
2.32.0

Re: [PATCH 17/49] cpufreq: replace cpumask_weight with cpumask_empty where appropriate

[Viresh Kumar]

On 10-02-22, 14:49, Yury Norov wrote:
> drivers/cpufreq calls cpumask_weight() to check if any bit of a given
> cpumask is set. We can do it more efficiently with cpumask_empty() because
> cpumask_empty() stops traversing the cpumask as soon as it finds first set
> bit, while cpumask_weight() counts all bits unconditionally.
> 
> Signed-off-by: Yury Norov <yury.norov@gmail.com>
> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> (for SCMI cpufreq driver)
> ---
>  drivers/cpufreq/qcom-cpufreq-hw.c | 2 +-
>  drivers/cpufreq/scmi-cpufreq.c    | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

I already applied it yesterday and replied to you as well. Did I miss
something ?

-- 
viresh

Re: [PATCH 17/49] cpufreq: replace cpumask_weight with cpumask_empty where appropriate

[Yury Norov]

On Fri, Feb 11, 2022 at 10:00:57AM +0530, Viresh Kumar wrote:
> On 10-02-22, 14:49, Yury Norov wrote:
> > drivers/cpufreq calls cpumask_weight() to check if any bit of a given
> > cpumask is set. We can do it more efficiently with cpumask_empty() because
> > cpumask_empty() stops traversing the cpumask as soon as it finds first set
> > bit, while cpumask_weight() counts all bits unconditionally.
> > 
> > Signed-off-by: Yury Norov <yury.norov@gmail.com>
> > Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> (for SCMI cpufreq driver)
> > ---
> >  drivers/cpufreq/qcom-cpufreq-hw.c | 2 +-
> >  drivers/cpufreq/scmi-cpufreq.c    | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> I already applied it yesterday and replied to you as well. Did I miss
> something ?

It appeared in next today after I prepared this series, that's why it
slipped through. Sorry for that. Please ignore this patch.

Thanks,
Yury