From: Suren Baghdasaryan surenb@google.com

mainline inclusion from mainline-v6.5-rc7 commit ec2444530612a886b406e2830d7f314d1a07d4bb category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I89DEJ CVE: NA

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When CONFIG_CGROUPS is disabled psi code generates the following warnings:

kernel/sched/psi.c:1112:21: warning: no previous prototype for 'psi_trigger_create' [-Wmissing-prototypes] 1112 | struct psi_trigger *psi_trigger_create(struct psi_group *group, | ^~~~~~~~~~~~~~~~~~ kernel/sched/psi.c:1182:6: warning: no previous prototype for 'psi_trigger_destroy' [-Wmissing-prototypes] 1182 | void psi_trigger_destroy(struct psi_trigger *t) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/psi.c:1249:10: warning: no previous prototype for 'psi_trigger_poll' [-Wmissing-prototypes] 1249 | __poll_t psi_trigger_poll(void **trigger_ptr, | ^~~~~~~~~~~~~~~~

Change declarations of these functions in the header to provide the prototypes even when they are unused.

Fixes: 0e94682b73bf ("psi: introduce psi monitor") Reported-by: kernel test robot lkp@intel.com Signed-off-by: Suren Baghdasaryan surenb@google.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: https://lkml.kernel.org/r/20220119223940.787748-2-surenb@google.com Signed-off-by: Xia Fukun xiafukun@huawei.com --- include/linux/psi.h | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/include/linux/psi.h b/include/linux/psi.h index d290f0493c33..c0c1d7e0c84d 100644 --- a/include/linux/psi.h +++ b/include/linux/psi.h @@ -26,18 +26,17 @@ void psi_memstall_enter(unsigned long *flags); void psi_memstall_leave(unsigned long *flags);

int psi_show(struct seq_file *s, struct psi_group *group, enum psi_res res); - -#ifdef CONFIG_CGROUPS -int psi_cgroup_alloc(struct cgroup *cgrp); -void psi_cgroup_free(struct cgroup *cgrp); -void cgroup_move_task(struct task_struct *p, struct css_set *to); - struct psi_trigger *psi_trigger_create(struct psi_group *group, char *buf, size_t nbytes, enum psi_res res); void psi_trigger_destroy(struct psi_trigger *t);

__poll_t psi_trigger_poll(void **trigger_ptr, struct file *file, poll_table *wait); + +#ifdef CONFIG_CGROUPS +int psi_cgroup_alloc(struct cgroup *cgrp); +void psi_cgroup_free(struct cgroup *cgrp); +void cgroup_move_task(struct task_struct *p, struct css_set *to); #endif

#else /* CONFIG_PSI */