powerpc/pseries/mobility: use struct for shared state

The atomic_t counter is the only shared state for the join/suspend
sequence so far, but that will change. Contain it in a
struct (pseries_suspend_info), and document its intended use. No
functional change.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210315080045.460331-2-nathanl@linux.ibm.com

diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
index ea4d6a6..a6739ce 100644 (file)
--- a/arch/powerpc/platforms/pseries/mobility.c
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -452,9 +452,21 @@ static int do_suspend(void)
        return ret;
 }
 
+/**
+ * struct pseries_suspend_info - State shared between CPUs for join/suspend.
+ * @counter: Threads are to increment this upon resuming from suspend
+ *           or if an error is received from H_JOIN. The thread which performs
+ *           the first increment (i.e. sets it to 1) is responsible for
+ *           waking the other threads.
+ */
+struct pseries_suspend_info {
+       atomic_t counter;
+};
+
 static int do_join(void *arg)
 {
-       atomic_t *counter = arg;
+       struct pseries_suspend_info *info = arg;
+       atomic_t *counter = &info->counter;
        long hvrc;
        int ret;
 
@@ -535,11 +547,15 @@ static int pseries_suspend(u64 handle)
        int ret;
 
        while (true) {
-               atomic_t counter = ATOMIC_INIT(0);
+               struct pseries_suspend_info info;
                unsigned long vasi_state;
                int vasi_err;
 
-               ret = stop_machine(do_join, &counter, cpu_online_mask);
+               info = (struct pseries_suspend_info) {
+                       .counter = ATOMIC_INIT(0),
+               };
+
+               ret = stop_machine(do_join, &info, cpu_online_mask);
                if (ret == 0)
                        break;
                /*