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authorXiaoming Ni <nixiaoming@huawei.com>2022-01-21 22:13:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-22 08:33:36 +0200
commitfdcd4073fccc6f989308be3f1d61d8a68cd990ce (patch)
tree1e0a053281887ae3486dccb6356639ca5f290ebd /kernel
parentd8c0418aac78e661b5283c9d6a1dfc61d44f26fd (diff)
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printk: fix build warning when CONFIG_PRINTK=n
build warning when CONFIG_PRINTK=n kernel/printk/printk.c:175:5: warning: no previous prototype for 'devkmsg_sysctl_set_loglvl' [-Wmissing-prototypes] devkmsg_sysctl_set_loglvl() is only used in sysctl.c when CONFIG_PRINTK=y, but it participates in the build when CONFIG_PRINTK=n. So add compile dependency CONFIG_PRINTK=y && CONFIG_SYSCTL=y to fix the build warning. Link: https://lkml.kernel.org/r/20211129211943.640266-5-mcgrof@kernel.org Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Eric Biggers <ebiggers@google.com> Cc: Iurii Zaikin <yzaikin@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Lukas Middendorf <kernel@tuxforce.de> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Stephen Kitt <steve@sk2.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/printk/internal.h2
-rw-r--r--kernel/printk/printk.c3
2 files changed, 4 insertions, 1 deletions
diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h
index 6b1c4b399845..d947ca6c84f9 100644
--- a/kernel/printk/internal.h
+++ b/kernel/printk/internal.h
@@ -6,6 +6,8 @@
#if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
void __init printk_sysctl_init(void);
+int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos);
#else
#define printk_sysctl_init() do { } while (0)
#endif
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 363a493bded8..82abfaf3c2aa 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -171,7 +171,7 @@ static int __init control_devkmsg(char *str)
__setup("printk.devkmsg=", control_devkmsg);
char devkmsg_log_str[DEVKMSG_STR_MAX_SIZE] = "ratelimit";
-
+#if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
@@ -210,6 +210,7 @@ int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
return 0;
}
+#endif /* CONFIG_PRINTK && CONFIG_SYSCTL */
/* Number of registered extended console drivers. */
static int nr_ext_console_drivers;