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powerpc/pseries/mobility: use struct for shared state

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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
This commit is contained in:
Nathan Lynch 2021-03-15 03:00:44 -05:00 committed by Michael Ellerman
parent cc7a0bb058
commit e834df6cfc
1 changed files with 19 additions and 3 deletions
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22
arch/powerpc/platforms/pseries/mobility.c
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@ -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;
/*