From: Frederic Weisbecker Date: Fri, 8 May 2026 13:16:35 +0000 (+0200) Subject: sched/cputime: Remove superfluous and error prone kcpustat_field() parameter X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=080b5c6d95034e46f5ed1abe98c06218a1386aef;p=thirdparty%2Fkernel%2Flinux.git sched/cputime: Remove superfluous and error prone kcpustat_field() parameter The first parameter to kcpustat_field() is a pointer to the cpu kcpustat to be fetched from. This parameter is error prone because a copy to a kcpustat could be passed by accident instead of the original one. Also the kcpustat structure can already be retrieved with the help of the mandatory CPU argument. Remove the needless parameter. Signed-off-by: Frederic Weisbecker Signed-off-by: Thomas Gleixner Tested-by: Shrikanth Hegde Reviewed-by: Shrikanth Hegde Link: https://patch.msgid.link/20260508131647.43868-4-frederic@kernel.org --- diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index 86f35e4519142..3c4a1f9af3ae8 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -105,7 +105,7 @@ void gov_update_cpu_data(struct dbs_data *dbs_data) j_cdbs->prev_cpu_idle = get_cpu_idle_time(j, &j_cdbs->prev_update_time, dbs_data->io_is_busy); if (dbs_data->ignore_nice_load) - j_cdbs->prev_cpu_nice = kcpustat_field(&kcpustat_cpu(j), CPUTIME_NICE, j); + j_cdbs->prev_cpu_nice = kcpustat_field(CPUTIME_NICE, j); } } } @@ -165,7 +165,7 @@ unsigned int dbs_update(struct cpufreq_policy *policy) j_cdbs->prev_cpu_idle = cur_idle_time; if (ignore_nice) { - u64 cur_nice = kcpustat_field(&kcpustat_cpu(j), CPUTIME_NICE, j); + u64 cur_nice = kcpustat_field(CPUTIME_NICE, j); idle_time += div_u64(cur_nice - j_cdbs->prev_cpu_nice, NSEC_PER_USEC); j_cdbs->prev_cpu_nice = cur_nice; @@ -539,7 +539,7 @@ int cpufreq_dbs_governor_start(struct cpufreq_policy *policy) j_cdbs->prev_load = 0; if (ignore_nice) - j_cdbs->prev_cpu_nice = kcpustat_field(&kcpustat_cpu(j), CPUTIME_NICE, j); + j_cdbs->prev_cpu_nice = kcpustat_field(CPUTIME_NICE, j); } gov->start(policy); diff --git a/drivers/macintosh/rack-meter.c b/drivers/macintosh/rack-meter.c index 8a1e2c08b0961..26cb93191edeb 100644 --- a/drivers/macintosh/rack-meter.c +++ b/drivers/macintosh/rack-meter.c @@ -87,7 +87,7 @@ static inline u64 get_cpu_idle_time(unsigned int cpu) kcpustat->cpustat[CPUTIME_IOWAIT]; if (rackmeter_ignore_nice) - retval += kcpustat_field(kcpustat, CPUTIME_NICE, cpu); + retval += kcpustat_field(CPUTIME_NICE, cpu); return retval; } diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h index b97ce2df376f9..dd020ecaf67b2 100644 --- a/include/linux/kernel_stat.h +++ b/include/linux/kernel_stat.h @@ -100,14 +100,12 @@ static inline unsigned long kstat_cpu_irqs_sum(unsigned int cpu) } #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN -extern u64 kcpustat_field(struct kernel_cpustat *kcpustat, - enum cpu_usage_stat usage, int cpu); +extern u64 kcpustat_field(enum cpu_usage_stat usage, int cpu); extern void kcpustat_cpu_fetch(struct kernel_cpustat *dst, int cpu); #else -static inline u64 kcpustat_field(struct kernel_cpustat *kcpustat, - enum cpu_usage_stat usage, int cpu) +static inline u64 kcpustat_field(enum cpu_usage_stat usage, int cpu) { - return kcpustat->cpustat[usage]; + return kcpustat_cpu(cpu).cpustat[usage]; } static inline void kcpustat_cpu_fetch(struct kernel_cpustat *dst, int cpu) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 55df6d37145e8..3cbf79bee976a 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -969,14 +969,11 @@ static int rcu_watching_snap_recheck(struct rcu_data *rdp) if (rcu_cpu_stall_cputime && rdp->snap_record.gp_seq != rdp->gp_seq) { int cpu = rdp->cpu; struct rcu_snap_record *rsrp; - struct kernel_cpustat *kcsp; - - kcsp = &kcpustat_cpu(cpu); rsrp = &rdp->snap_record; - rsrp->cputime_irq = kcpustat_field(kcsp, CPUTIME_IRQ, cpu); - rsrp->cputime_softirq = kcpustat_field(kcsp, CPUTIME_SOFTIRQ, cpu); - rsrp->cputime_system = kcpustat_field(kcsp, CPUTIME_SYSTEM, cpu); + rsrp->cputime_irq = kcpustat_field(CPUTIME_IRQ, cpu); + rsrp->cputime_softirq = kcpustat_field(CPUTIME_SOFTIRQ, cpu); + rsrp->cputime_system = kcpustat_field(CPUTIME_SYSTEM, cpu); rsrp->nr_hardirqs = kstat_cpu_irqs_sum(cpu) + arch_irq_stat_cpu(cpu); rsrp->nr_softirqs = kstat_cpu_softirqs_sum(cpu); rsrp->nr_csw = nr_context_switches_cpu(cpu); diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index b67532cb87705..cf7ae51cba403 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -479,7 +479,6 @@ static void print_cpu_stat_info(int cpu) { struct rcu_snap_record rsr, *rsrp; struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); - struct kernel_cpustat *kcsp = &kcpustat_cpu(cpu); if (!rcu_cpu_stall_cputime) return; @@ -488,9 +487,9 @@ static void print_cpu_stat_info(int cpu) if (rsrp->gp_seq != rdp->gp_seq) return; - rsr.cputime_irq = kcpustat_field(kcsp, CPUTIME_IRQ, cpu); - rsr.cputime_softirq = kcpustat_field(kcsp, CPUTIME_SOFTIRQ, cpu); - rsr.cputime_system = kcpustat_field(kcsp, CPUTIME_SYSTEM, cpu); + rsr.cputime_irq = kcpustat_field(CPUTIME_IRQ, cpu); + rsr.cputime_softirq = kcpustat_field(CPUTIME_SOFTIRQ, cpu); + rsr.cputime_system = kcpustat_field(CPUTIME_SYSTEM, cpu); pr_err("\t hardirqs softirqs csw/system\n"); pr_err("\t number: %8lld %10d %12lld\n", diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index fbf31db0d2f3c..caaaf0a04ced9 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -975,10 +975,9 @@ static int kcpustat_field_vtime(u64 *cpustat, return 0; } -u64 kcpustat_field(struct kernel_cpustat *kcpustat, - enum cpu_usage_stat usage, int cpu) +u64 kcpustat_field(enum cpu_usage_stat usage, int cpu) { - u64 *cpustat = kcpustat->cpustat; + u64 *cpustat = kcpustat_cpu(cpu).cpustat; u64 val = cpustat[usage]; struct rq *rq; int err;