Patch-mainline: Submitted, 1 Mar 2021 14:17:33, lkml
References: bsc#1180846
From: Juergen Gross <jgross@suse.com>
Subject: [PATCH 2/4] kernel/smp: prepare more CSD lock debugging
In order to be able to easily add more CSD lock debugging data to
struct call_function_data->csd move the call_single_data_t element
into a sub-structure.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
kernel/smp.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -32,8 +32,12 @@ enum {
CSD_FLAG_SYNCHRONOUS = 0x02,
};
+struct cfd_percpu {
+ call_single_data_t csd;
+};
+
struct call_function_data {
- call_single_data_t __percpu *csd;
+ struct cfd_percpu __percpu *pcpu;
cpumask_var_t cpumask;
cpumask_var_t cpumask_ipi;
};
@@ -56,8 +60,8 @@ int smpcfd_prepare_cpu(unsigned int cpu)
free_cpumask_var(cfd->cpumask);
return -ENOMEM;
}
- cfd->csd = alloc_percpu(call_single_data_t);
- if (!cfd->csd) {
+ cfd->pcpu = alloc_percpu(struct cfd_percpu);
+ if (!cfd->pcpu) {
free_cpumask_var(cfd->cpumask);
free_cpumask_var(cfd->cpumask_ipi);
return -ENOMEM;
@@ -72,7 +76,7 @@ int smpcfd_dead_cpu(unsigned int cpu)
free_cpumask_var(cfd->cpumask);
free_cpumask_var(cfd->cpumask_ipi);
- free_percpu(cfd->csd);
+ free_percpu(cfd->pcpu);
return 0;
}
@@ -596,7 +600,7 @@ static void smp_call_function_many_cond(
cpumask_clear(cfd->cpumask_ipi);
for_each_cpu(cpu, cfd->cpumask) {
- call_single_data_t *csd = per_cpu_ptr(cfd->csd, cpu);
+ call_single_data_t *csd = &per_cpu_ptr(cfd->pcpu, cpu)->csd;
if (cond_func && !cond_func(cpu, info))
continue;
@@ -621,7 +625,7 @@ static void smp_call_function_many_cond(
for_each_cpu(cpu, cfd->cpumask) {
call_single_data_t *csd;
- csd = per_cpu_ptr(cfd->csd, cpu);
+ csd = &per_cpu_ptr(cfd->pcpu, cpu)->csd;
csd_lock_wait(csd);
}
}