[PATCH printk v5 15/30] printk: Make console_is_usable() available to nbcon

John Ogness
2024-05-02T21:38:51Z

Move console_is_usable() as-is into internal.h so that it can
be used by nbcon printing functions as well.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
---
kernel/printk/internal.h | 32 ++++++++++++++++++++++++++++++++
kernel/printk/printk.c | 30 ------------------------------
2 files changed, 32 insertions(+), 30 deletions(-)

diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h
index 6c1d01eabf3b..339563dd60bb 100644
--- a/kernel/printk/internal.h
+++ b/kernel/printk/internal.h
@@ -85,6 +85,36 @@ bool nbcon_alloc(struct console *con);
void nbcon_init(struct console *con, u64 init_seq);
void nbcon_free(struct console *con);

+/*
+ * Check if the given console is currently capable and allowed to print
+ * records.
+ *
+ * Requires the console_srcu_read_lock.
+ */
+static inline bool console_is_usable(struct console *con)
+{
+ short flags = console_srcu_read_flags(con);
+
+ if (!(flags & CON_ENABLED))
+ return false;
+
+ if ((flags & CON_SUSPENDED))
+ return false;
+
+ if (!con->write)
+ return false;
+
+ /*
+ * Console drivers may assume that per-cpu resources have been
+ * allocated. So unless they're explicitly marked as being able to
+ * cope (CON_ANYTIME) don't call them until this CPU is officially up.
+ */
+ if (!cpu_online(raw_smp_processor_id()) && !(flags & CON_ANYTIME))
+ return false;
+
+ return true;
+}
+
#else

#define PRINTK_PREFIX_MAX 0
@@ -106,6 +136,8 @@ static inline bool nbcon_alloc(struct console *con) { return false; }
static inline void nbcon_init(struct console *con, u64 init_seq) { }
static inline void nbcon_free(struct console *con) { }

+static inline bool console_is_usable(struct console *con) { return false; }
+
#endif /* CONFIG_PRINTK */

extern struct printk_buffers printk_shared_pbufs;
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 15d19d8461ed..b0e99ee472e1 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2697,36 +2697,6 @@ int is_console_locked(void)
}
EXPORT_SYMBOL(is_console_locked);

-/*
- * Check if the given console is currently capable and allowed to print
- * records.
- *
- * Requires the console_srcu_read_lock.
- */
-static inline bool console_is_usable(struct console *con)
-{
- short flags = console_srcu_read_flags(con);
-
- if (!(flags & CON_ENABLED))
- return false;
-
- if ((flags & CON_SUSPENDED))
- return false;
-
- if (!con->write)
- return false;
-
- /*
- * Console drivers may assume that per-cpu resources have been
- * allocated. So unless they're explicitly marked as being able to
- * cope (CON_ANYTIME) don't call them until this CPU is officially up.
- */
- if (!cpu_online(raw_smp_processor_id()) && !(flags & CON_ANYTIME))
- return false;
-
- return true;
-}
-
static void __console_unlock(void)
{
console_locked = 0;
--
2.39.2