2022-01-21 20:07:34

by Suren Baghdasaryan

[permalink] [raw]
Subject: [PATCH 2/2] psi: Fix "defined but not used" warnings when CONFIG_PROC_FS=n

When CONFIG_PROC_FS is disabled psi code generates the following warnings:

kernel/sched/psi.c:1364:30: warning: 'psi_cpu_proc_ops' defined but not used [-Wunused-const-variable=]
1364 | static const struct proc_ops psi_cpu_proc_ops = {
| ^~~~~~~~~~~~~~~~
kernel/sched/psi.c:1355:30: warning: 'psi_memory_proc_ops' defined but not used [-Wunused-const-variable=]
1355 | static const struct proc_ops psi_memory_proc_ops = {
| ^~~~~~~~~~~~~~~~~~~
kernel/sched/psi.c:1346:30: warning: 'psi_io_proc_ops' defined but not used [-Wunused-const-variable=]
1346 | static const struct proc_ops psi_io_proc_ops = {
| ^~~~~~~~~~~~~~~

Make definitions of these structures and related functions conditional on
CONFIG_PROC_FS config.

Fixes: 0e94682b73bf ("psi: introduce psi monitor")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Suren Baghdasaryan <[email protected]>
---
kernel/sched/psi.c | 79 ++++++++++++++++++++++++----------------------
1 file changed, 41 insertions(+), 38 deletions(-)

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index c137c4d6983e..e14358178849 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1082,44 +1082,6 @@ int psi_show(struct seq_file *m, struct psi_group *group, enum psi_res res)
return 0;
}

-static int psi_io_show(struct seq_file *m, void *v)
-{
- return psi_show(m, &psi_system, PSI_IO);
-}
-
-static int psi_memory_show(struct seq_file *m, void *v)
-{
- return psi_show(m, &psi_system, PSI_MEM);
-}
-
-static int psi_cpu_show(struct seq_file *m, void *v)
-{
- return psi_show(m, &psi_system, PSI_CPU);
-}
-
-static int psi_open(struct file *file, int (*psi_show)(struct seq_file *, void *))
-{
- if (file->f_mode & FMODE_WRITE && !capable(CAP_SYS_RESOURCE))
- return -EPERM;
-
- return single_open(file, psi_show, NULL);
-}
-
-static int psi_io_open(struct inode *inode, struct file *file)
-{
- return psi_open(file, psi_io_show);
-}
-
-static int psi_memory_open(struct inode *inode, struct file *file)
-{
- return psi_open(file, psi_memory_show);
-}
-
-static int psi_cpu_open(struct inode *inode, struct file *file)
-{
- return psi_open(file, psi_cpu_show);
-}
-
struct psi_trigger *psi_trigger_create(struct psi_group *group,
char *buf, size_t nbytes, enum psi_res res)
{
@@ -1278,6 +1240,45 @@ __poll_t psi_trigger_poll(void **trigger_ptr,
return ret;
}

+#ifdef CONFIG_PROC_FS
+static int psi_io_show(struct seq_file *m, void *v)
+{
+ return psi_show(m, &psi_system, PSI_IO);
+}
+
+static int psi_memory_show(struct seq_file *m, void *v)
+{
+ return psi_show(m, &psi_system, PSI_MEM);
+}
+
+static int psi_cpu_show(struct seq_file *m, void *v)
+{
+ return psi_show(m, &psi_system, PSI_CPU);
+}
+
+static int psi_open(struct file *file, int (*psi_show)(struct seq_file *, void *))
+{
+ if (file->f_mode & FMODE_WRITE && !capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ return single_open(file, psi_show, NULL);
+}
+
+static int psi_io_open(struct inode *inode, struct file *file)
+{
+ return psi_open(file, psi_io_show);
+}
+
+static int psi_memory_open(struct inode *inode, struct file *file)
+{
+ return psi_open(file, psi_memory_show);
+}
+
+static int psi_cpu_open(struct inode *inode, struct file *file)
+{
+ return psi_open(file, psi_cpu_show);
+}
+
static ssize_t psi_write(struct file *file, const char __user *user_buf,
size_t nbytes, enum psi_res res)
{
@@ -1392,3 +1393,5 @@ static int __init psi_proc_init(void)
return 0;
}
module_init(psi_proc_init);
+
+#endif /* CONFIG_PROC_FS */
--
2.34.1.703.g22d0c6ccf7-goog


2022-01-21 22:22:44

by Johannes Weiner

[permalink] [raw]
Subject: Re: [PATCH 2/2] psi: Fix "defined but not used" warnings when CONFIG_PROC_FS=n

On Wed, Jan 19, 2022 at 02:39:40PM -0800, Suren Baghdasaryan wrote:
> When CONFIG_PROC_FS is disabled psi code generates the following warnings:
>
> kernel/sched/psi.c:1364:30: warning: 'psi_cpu_proc_ops' defined but not used [-Wunused-const-variable=]
> 1364 | static const struct proc_ops psi_cpu_proc_ops = {
> | ^~~~~~~~~~~~~~~~
> kernel/sched/psi.c:1355:30: warning: 'psi_memory_proc_ops' defined but not used [-Wunused-const-variable=]
> 1355 | static const struct proc_ops psi_memory_proc_ops = {
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/psi.c:1346:30: warning: 'psi_io_proc_ops' defined but not used [-Wunused-const-variable=]
> 1346 | static const struct proc_ops psi_io_proc_ops = {
> | ^~~~~~~~~~~~~~~
>
> Make definitions of these structures and related functions conditional on
> CONFIG_PROC_FS config.
>
> Fixes: 0e94682b73bf ("psi: introduce psi monitor")
> Reported-by: kernel test robot <[email protected]>
> Signed-off-by: Suren Baghdasaryan <[email protected]>

Acked-by: Johannes Weiner <[email protected]>

Subject: [tip: sched/core] psi: Fix "defined but not used" warnings when CONFIG_PROC_FS=n

The following commit has been merged into the sched/core branch of tip:

Commit-ID: 5102bb1c9f82857a3164af9d7ab7ad628cb783ed
Gitweb: https://git.kernel.org/tip/5102bb1c9f82857a3164af9d7ab7ad628cb783ed
Author: Suren Baghdasaryan <[email protected]>
AuthorDate: Wed, 19 Jan 2022 14:39:40 -08:00
Committer: Peter Zijlstra <[email protected]>
CommitterDate: Thu, 27 Jan 2022 12:57:19 +01:00

psi: Fix "defined but not used" warnings when CONFIG_PROC_FS=n

When CONFIG_PROC_FS is disabled psi code generates the following warnings:

kernel/sched/psi.c:1364:30: warning: 'psi_cpu_proc_ops' defined but not used [-Wunused-const-variable=]
1364 | static const struct proc_ops psi_cpu_proc_ops = {
| ^~~~~~~~~~~~~~~~
kernel/sched/psi.c:1355:30: warning: 'psi_memory_proc_ops' defined but not used [-Wunused-const-variable=]
1355 | static const struct proc_ops psi_memory_proc_ops = {
| ^~~~~~~~~~~~~~~~~~~
kernel/sched/psi.c:1346:30: warning: 'psi_io_proc_ops' defined but not used [-Wunused-const-variable=]
1346 | static const struct proc_ops psi_io_proc_ops = {
| ^~~~~~~~~~~~~~~

Make definitions of these structures and related functions conditional on
CONFIG_PROC_FS config.

Fixes: 0e94682b73bf ("psi: introduce psi monitor")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
---
kernel/sched/psi.c | 79 +++++++++++++++++++++++----------------------
1 file changed, 41 insertions(+), 38 deletions(-)

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index a679613..cfe76f7 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1082,44 +1082,6 @@ int psi_show(struct seq_file *m, struct psi_group *group, enum psi_res res)
return 0;
}

-static int psi_io_show(struct seq_file *m, void *v)
-{
- return psi_show(m, &psi_system, PSI_IO);
-}
-
-static int psi_memory_show(struct seq_file *m, void *v)
-{
- return psi_show(m, &psi_system, PSI_MEM);
-}
-
-static int psi_cpu_show(struct seq_file *m, void *v)
-{
- return psi_show(m, &psi_system, PSI_CPU);
-}
-
-static int psi_open(struct file *file, int (*psi_show)(struct seq_file *, void *))
-{
- if (file->f_mode & FMODE_WRITE && !capable(CAP_SYS_RESOURCE))
- return -EPERM;
-
- return single_open(file, psi_show, NULL);
-}
-
-static int psi_io_open(struct inode *inode, struct file *file)
-{
- return psi_open(file, psi_io_show);
-}
-
-static int psi_memory_open(struct inode *inode, struct file *file)
-{
- return psi_open(file, psi_memory_show);
-}
-
-static int psi_cpu_open(struct inode *inode, struct file *file)
-{
- return psi_open(file, psi_cpu_show);
-}
-
struct psi_trigger *psi_trigger_create(struct psi_group *group,
char *buf, size_t nbytes, enum psi_res res)
{
@@ -1296,6 +1258,45 @@ __poll_t psi_trigger_poll(void **trigger_ptr,
return ret;
}

+#ifdef CONFIG_PROC_FS
+static int psi_io_show(struct seq_file *m, void *v)
+{
+ return psi_show(m, &psi_system, PSI_IO);
+}
+
+static int psi_memory_show(struct seq_file *m, void *v)
+{
+ return psi_show(m, &psi_system, PSI_MEM);
+}
+
+static int psi_cpu_show(struct seq_file *m, void *v)
+{
+ return psi_show(m, &psi_system, PSI_CPU);
+}
+
+static int psi_open(struct file *file, int (*psi_show)(struct seq_file *, void *))
+{
+ if (file->f_mode & FMODE_WRITE && !capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ return single_open(file, psi_show, NULL);
+}
+
+static int psi_io_open(struct inode *inode, struct file *file)
+{
+ return psi_open(file, psi_io_show);
+}
+
+static int psi_memory_open(struct inode *inode, struct file *file)
+{
+ return psi_open(file, psi_memory_show);
+}
+
+static int psi_cpu_open(struct inode *inode, struct file *file)
+{
+ return psi_open(file, psi_cpu_show);
+}
+
static ssize_t psi_write(struct file *file, const char __user *user_buf,
size_t nbytes, enum psi_res res)
{
@@ -1400,3 +1401,5 @@ static int __init psi_proc_init(void)
return 0;
}
module_init(psi_proc_init);
+
+#endif /* CONFIG_PROC_FS */