[PATCH 38/49] arch/powerpc: replace cpumask_weight with cpumask_weight_{eq, ...} where appropriate

[PATCH 38/49] arch/powerpc: replace cpumask_weight with cpumask_weight_{eq, ...} where appropriate

[Yury Norov]

PowerPC code uses cpumask_weight() to compare the weight of cpumask with
a given number. We can do it more efficiently with cpumask_weight_{eq, ...}
because conditional cpumask_weight may stop traversing the cpumask earlier,
as soon as condition is (or can't be)  met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 arch/powerpc/kernel/smp.c      | 2 +-
 arch/powerpc/kernel/watchdog.c | 2 +-
 arch/powerpc/xmon/xmon.c       | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index b7fd6a72aa76..8bff748df402 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1656,7 +1656,7 @@ void start_secondary(void *unused)
 		if (has_big_cores)
 			sibling_mask = cpu_smallcore_mask;
 
-		if (cpumask_weight(mask) > cpumask_weight(sibling_mask(cpu)))
+		if (cpumask_weight_gt(mask, cpumask_weight(sibling_mask(cpu))))
 			shared_caches = true;
 	}
 
diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c
index bfc27496fe7e..62937a077de7 100644
--- a/arch/powerpc/kernel/watchdog.c
+++ b/arch/powerpc/kernel/watchdog.c
@@ -483,7 +483,7 @@ static void start_watchdog(void *arg)
 
 	wd_smp_lock(&flags);
 	cpumask_set_cpu(cpu, &wd_cpus_enabled);
-	if (cpumask_weight(&wd_cpus_enabled) == 1) {
+	if (cpumask_weight_eq(&wd_cpus_enabled, 1)) {
 		cpumask_set_cpu(cpu, &wd_smp_cpus_pending);
 		wd_smp_last_reset_tb = get_tb();
 	}
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index fd72753e8ad5..b423812e94e0 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -469,7 +469,7 @@ static bool wait_for_other_cpus(int ncpus)
 
 	/* We wait for 2s, which is a metric "little while" */
 	for (timeout = 20000; timeout != 0; --timeout) {
-		if (cpumask_weight(&cpus_in_xmon) >= ncpus)
+		if (cpumask_weight_ge(&cpus_in_xmon, ncpus))
 			return true;
 		udelay(100);
 		barrier();
@@ -1338,7 +1338,7 @@ static int cpu_cmd(void)
 			case 'S':
 			case 't':
 				cpumask_copy(&xmon_batch_cpus, &cpus_in_xmon);
-				if (cpumask_weight(&xmon_batch_cpus) <= 1) {
+				if (cpumask_weight_le(&xmon_batch_cpus, 1)) {
 					printf("There are no other cpus in xmon\n");
 					break;
 				}
-- 
2.32.0

[PATCH 43/49] soc/qman: replace cpumask_weight with cpumask_weight_lt

[Yury Norov]

qman_test_stash() calls cpumask_weight() to compare the weight of cpumask
with a given number. We can do it more efficiently with cpumask_weight_lt
because conditional cpumask_weight may stop traversing the cpumask earlier,
as soon as condition is (or can't be) met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 drivers/soc/fsl/qbman/qman_test_stash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/qbman/qman_test_stash.c b/drivers/soc/fsl/qbman/qman_test_stash.c
index b7e8e5ec884c..28b08568a349 100644
--- a/drivers/soc/fsl/qbman/qman_test_stash.c
+++ b/drivers/soc/fsl/qbman/qman_test_stash.c
@@ -561,7 +561,7 @@ int qman_test_stash(void)
 {
 	int err;
 
-	if (cpumask_weight(cpu_online_mask) < 2) {
+	if (cpumask_weight_lt(cpu_online_mask, 2)) {
 		pr_info("%s(): skip - only 1 CPU\n", __func__);
 		return 0;
 	}
-- 
2.32.0

Re: [PATCH 38/49] arch/powerpc: replace cpumask_weight with cpumask_weight_{eq, ...} where appropriate

[Michael Ellerman]

Yury Norov <yury.norov@gmail.com> writes:
> PowerPC code uses cpumask_weight() to compare the weight of cpumask with
> a given number. We can do it more efficiently with cpumask_weight_{eq, ...}
> because conditional cpumask_weight may stop traversing the cpumask earlier,
> as soon as condition is (or can't be)  met.
>
> Signed-off-by: Yury Norov <yury.norov@gmail.com>
> ---
>  arch/powerpc/kernel/smp.c      | 2 +-
>  arch/powerpc/kernel/watchdog.c | 2 +-
>  arch/powerpc/xmon/xmon.c       | 4 ++--
>  3 files changed, 4 insertions(+), 4 deletions(-)

Acked-by: Michael Ellerman <mpe@ellerman.id.au>

cheers