[PATCH v3 2/4] kernel/smp: prepare more CSD lock debugging

[Juergen Gross]

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 <jgr...@suse.com>
---
 kernel/smp.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index d5f0b21ab55e..6d7e6dbe33dc 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -31,8 +31,12 @@
 
 #define CSD_TYPE(_csd) ((_csd)->node.u_flags & CSD_FLAG_TYPE_MASK)
 
+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;
 };
@@ -55,8 +59,8 @@ 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;
@@ -71,7 +75,7 @@ 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;
 }
 
@@ -694,7 +698,7 @@ static void smp_call_function_many_cond(const struct 
cpumask *mask,
 
        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;
@@ -719,7 +723,7 @@ static void smp_call_function_many_cond(const struct 
cpumask *mask,
                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);
                }
        }
-- 
2.26.2