UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

s390/smp: consolidate locking for smp_rescan() 

Move locking to __smp_rescan() instead of duplicating it to all call sites.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-02-17 07:10:46 +01:00 committed by Vasily Gorbik
parent 4c86d2f51a
commit 588a079ebd
1 changed files with 4 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/s390/kernel/smp.c
View File

@ -780,6 +780,8 @@ static int __smp_rescan_cpus(struct sclp_core_info *info, bool early)
u16 core_id;
int nr, i;
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
nr = 0;
cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
/*
@ -800,6 +802,8 @@ static int __smp_rescan_cpus(struct sclp_core_info *info, bool early)
configured = i < info->configured;
nr += smp_add_core(&info->core[i], &avail, configured, early);
}
mutex_unlock(&smp_cpu_state_mutex);
put_online_cpus();
return nr;
}
@ -847,9 +851,7 @@ void __init smp_detect_cpus(void)
pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
/* Add CPUs present at boot */
get_online_cpus();
__smp_rescan_cpus(info, true);
put_online_cpus();
memblock_free_early((unsigned long)info, sizeof(*info));
}
@ -1178,11 +1180,7 @@ int __ref smp_rescan_cpus(void)
if (!info)
return -ENOMEM;
smp_get_core_info(info, 0);
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
nr = __smp_rescan_cpus(info, false);
mutex_unlock(&smp_cpu_state_mutex);
put_online_cpus();
kfree(info);
if (nr)
topology_schedule_update();