[PATCH 01/17] all: don't use bitmap_weight() where possible

Yury Norov
2021-12-18T21:20:28Z

Don't call bitmap_weight() if the following code can get by
without it.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
drivers/net/dsa/b53/b53_common.c | 6 +-----
drivers/net/ethernet/broadcom/bcmsysport.c | 6 +-----
drivers/thermal/intel/intel_powerclamp.c | 9 +++------
3 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 3867f3d4545f..9a10d80125d9 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1620,12 +1620,8 @@ static int b53_arl_read(struct b53_device *dev, u64 mac,
return 0;
}

- if (bitmap_weight(free_bins, dev->num_arl_bins) == 0)
- return -ENOSPC;
-
*idx = find_first_bit(free_bins, dev->num_arl_bins);
-
- return -ENOENT;
+ return *idx >= dev->num_arl_bins ? -ENOSPC : -ENOENT;
}

static int b53_arl_op(struct b53_device *dev, int op, int port,
diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index 40933bf5a710..241696fdc6c7 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -2177,13 +2177,9 @@ static int bcm_sysport_rule_set(struct bcm_sysport_priv *priv,
if (nfc->fs.ring_cookie != RX_CLS_FLOW_WAKE)
return -EOPNOTSUPP;

- /* All filters are already in use, we cannot match more rules */
- if (bitmap_weight(priv->filters, RXCHK_BRCM_TAG_MAX) ==
- RXCHK_BRCM_TAG_MAX)
- return -ENOSPC;
-
index = find_first_zero_bit(priv->filters, RXCHK_BRCM_TAG_MAX);
if (index >= RXCHK_BRCM_TAG_MAX)
+ /* All filters are already in use, we cannot match more rules */
return -ENOSPC;

/* Location is the classification ID, and index is the position
diff --git a/drivers/thermal/intel/intel_powerclamp.c b/drivers/thermal/intel/intel_powerclamp.c
index 14256421d98c..c841ab37e7c6 100644
--- a/drivers/thermal/intel/intel_powerclamp.c
+++ b/drivers/thermal/intel/intel_powerclamp.c
@@ -556,12 +556,9 @@ static void end_power_clamp(void)
* stop faster.
*/
clamping = false;
- if (bitmap_weight(cpu_clamping_mask, num_possible_cpus())) {
- for_each_set_bit(i, cpu_clamping_mask, num_possible_cpus()) {
- pr_debug("clamping worker for cpu %d alive, destroy\n",
- i);
- stop_power_clamp_worker(i);
- }
+ for_each_set_bit(i, cpu_clamping_mask, num_possible_cpus()) {
+ pr_debug("clamping worker for cpu %d alive, destroy\n", i);
+ stop_power_clamp_worker(i);
}
}

--
2.30.2