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cpumask: replace cpumask_next_* with cpumask_first_* where appropriate 

cpumask_first() is a more effective analogue of 'next' version if n == -1
(which means start == 0). This patch replaces 'next' with 'first' where
things look trivial.

There's no cpumask_first_zero() function, so create it.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Yury Norov 2021-08-14 14:17:05 -07:00
parent 4ade0818cf
commit 9b51d9d866
6 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/blk-mq.c
View File

@ -2967,7 +2967,7 @@ static bool blk_mq_hctx_has_requests(struct blk_mq_hw_ctx *hctx)
static inline bool blk_mq_last_cpu_in_hctx(unsigned int cpu,
struct blk_mq_hw_ctx *hctx)
{
if (cpumask_next_and(-1, hctx->cpumask, cpu_online_mask) != cpu)
if (cpumask_first_and(hctx->cpumask, cpu_online_mask) != cpu)
return false;
if (cpumask_next_and(cpu, hctx->cpumask, cpu_online_mask) < nr_cpu_ids)
return false;

2
drivers/net/virtio_net.c
View File

@ -2101,7 +2101,7 @@ static void virtnet_set_affinity(struct virtnet_info *vi)
stragglers = num_cpu >= vi->curr_queue_pairs ?
num_cpu % vi->curr_queue_pairs :
0;
cpu = cpumask_next(-1, cpu_online_mask);
cpu = cpumask_first(cpu_online_mask);
for (i = 0; i < vi->curr_queue_pairs; i++) {
group_size = stride + (i < stragglers ? 1 : 0);

2
drivers/soc/fsl/qbman/bman_portal.c
View File

@ -155,7 +155,7 @@ static int bman_portal_probe(struct platform_device *pdev)
}
spin_lock(&bman_lock);
cpu = cpumask_next_zero(-1, &portal_cpus);
cpu = cpumask_first_zero(&portal_cpus);
if (cpu >= nr_cpu_ids) {
__bman_portals_probed = 1;
/* unassigned portal, skip init */

2
drivers/soc/fsl/qbman/qman_portal.c
View File

@ -248,7 +248,7 @@ static int qman_portal_probe(struct platform_device *pdev)
pcfg->pools = qm_get_pools_sdqcr();
spin_lock(&qman_lock);
cpu = cpumask_next_zero(-1, &portal_cpus);
cpu = cpumask_first_zero(&portal_cpus);
if (cpu >= nr_cpu_ids) {
__qman_portals_probed = 1;
/* unassigned portal, skip init */

16
include/linux/cpumask.h
View File

@ -123,6 +123,11 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp)
return 0;
}
static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
{
return 0;
}
static inline unsigned int cpumask_first_and(const struct cpumask *srcp1,
const struct cpumask *srcp2)
{
@ -201,6 +206,17 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp)
return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
}
/**
* cpumask_first_zero - get the first unset cpu in a cpumask
* @srcp: the cpumask pointer
*
* Returns >= nr_cpu_ids if all cpus are set.
*/
static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
{
return find_first_zero_bit(cpumask_bits(srcp), nr_cpumask_bits);
}
/**
* cpumask_first_and - return the first cpu from *srcp1 & *srcp2
* @src1p: the first input

4
kernel/time/clocksource.c
View File

@ -257,7 +257,7 @@ static void clocksource_verify_choose_cpus(void)
return;
/* Make sure to select at least one CPU other than the current CPU. */
cpu = cpumask_next(-1, cpu_online_mask);
cpu = cpumask_first(cpu_online_mask);
if (cpu == smp_processor_id())
cpu = cpumask_next(cpu, cpu_online_mask);
if (WARN_ON_ONCE(cpu >= nr_cpu_ids))
@ -279,7 +279,7 @@ static void clocksource_verify_choose_cpus(void)
cpu = prandom_u32() % nr_cpu_ids;
cpu = cpumask_next(cpu - 1, cpu_online_mask);
if (cpu >= nr_cpu_ids)
cpu = cpumask_next(-1, cpu_online_mask);
cpu = cpumask_first(cpu_online_mask);
if (!WARN_ON_ONCE(cpu >= nr_cpu_ids))
cpumask_set_cpu(cpu, &cpus_chosen);
}