Subject: [PATCH 19/48] printk: Add @flags argument for console_is_usable()
From: John Ogness <[email-masked]>
Date: Tue, 12 Sep 2023 13:45:33 +0000

The caller of console_is_usable() usually needs @console->flags
for its own checks. Rather than having console_is_usable() read
its own copy, make the caller pass in the @flags. This also
ensures that the caller saw the same @flags value.

Signed-off-by: John Ogness <[email-masked]>
Reviewed-by: Petr Mladek <[email-masked]>
Signed-off-by: Sebastian Andrzej Siewior <[email-masked]>
---
 kernel/printk/internal.h |    8 ++------
 kernel/printk/printk.c   |    5 +++--
 2 files changed, 5 insertions(+), 8 deletions(-)

Index: linux-6.8.2-rt10/kernel/printk/internal.h
===================================================================
--- linux-6.8.2-rt10.orig/kernel/printk/internal.h
+++ linux-6.8.2-rt10/kernel/printk/internal.h
@@ -90,13 +90,9 @@ void nbcon_free(struct console *con);
  * records. Note that this function does not consider the current context,
  * which can also play a role in deciding if @con can be used to print
  * records.
- *
- * Requires the console_srcu_read_lock.
  */
-static inline bool console_is_usable(struct console *con)
+static inline bool console_is_usable(struct console *con, short flags)
 {
-	short flags = console_srcu_read_flags(con);
-
 	if (!(flags & CON_ENABLED))
 		return false;
 
@@ -143,7 +139,7 @@ static inline bool nbcon_alloc(struct co
 static inline void nbcon_init(struct console *con) { }
 static inline void nbcon_free(struct console *con) { }
 
-static inline bool console_is_usable(struct console *con) { return false; }
+static inline bool console_is_usable(struct console *con, short flags) { return false; }
 
 #endif /* CONFIG_PRINTK */
 
Index: linux-6.8.2-rt10/kernel/printk/printk.c
===================================================================
--- linux-6.8.2-rt10.orig/kernel/printk/printk.c
+++ linux-6.8.2-rt10/kernel/printk/printk.c
@@ -2947,9 +2947,10 @@ static bool console_flush_all(bool do_co
 
 		cookie = console_srcu_read_lock();
 		for_each_console_srcu(con) {
+			short flags = console_srcu_read_flags(con);
 			bool progress;
 
-			if (!console_is_usable(con))
+			if (!console_is_usable(con, flags))
 				continue;
 			any_usable = true;
 
@@ -3819,7 +3820,7 @@ static bool __pr_flush(struct console *c
 			 * that they make forward progress, so only increment
 			 * @diff for usable consoles.
 			 */
-			if (!console_is_usable(c))
+			if (!console_is_usable(c, flags))
 				continue;
 
 			if (flags & CON_NBCON) {