diff options
| author | Nathan Lynch <nathanl@linux.ibm.com> | 2021-03-15 03:00:44 -0500 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-23 09:25:12 +1100 |
| commit | e834df6cfc71d8e5ce2c27a0184145ea125c3f0f (patch) | |
| tree | 666a8d351a8c4c779d24f73c7aa1a627606e60de /arch | |
| parent | cc7a0bb058b85ea03db87169c60c7cfdd5d34678 (diff) | |
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/pseries/mobility.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c index ea4d6a660e0d..a6739ce9feac 100644 --- 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; /* |