Merge tag 'printk-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Add new "hash_pointers=[auto|always|never]" boot parameter to force
   the hashing even with "slab_debug" enabled

 - Allow to stop CPU, after losing nbcon console ownership during
   panic(), even without proper NMI

 - Allow to use the printk kthread immediately even for the 1st
   registered nbcon

 - Compiler warning removal

* tag 'printk-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: nbcon: Allow reacquire during panic
  printk: Allow to use the printk kthread immediately even for 1st nbcon
  slab: Decouple slab_debug and no_hash_pointers
  vsprintf: Use __diag macros to disable '-Wsuggest-attribute=format'
  compiler-gcc.h: Introduce __diag_GCC_all

1 files changed, 11 insertions, 9 deletions

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 1eea80d0648e..0efbcdda9aab 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3574,7 +3574,7 @@ EXPORT_SYMBOL(console_resume);
 static int unregister_console_locked(struct console *console);
 
 /* True when system boot is far enough to create printer threads. */
-static bool printk_kthreads_ready __ro_after_init;
+bool printk_kthreads_ready __ro_after_init;
 
 static struct task_struct *printk_legacy_kthread;
 
@@ -3713,6 +3713,7 @@ static void printk_kthreads_check_locked(void)
 	if (!printk_kthreads_ready)
 		return;
 
+	/* Start or stop the legacy kthread when needed. */
 	if (have_legacy_console || have_boot_console) {
 		if (!printk_legacy_kthread &&
 		    force_legacy_kthread() &&
@@ -4204,14 +4205,6 @@ static int unregister_console_locked(struct console *console)
 	 */
 	synchronize_srcu(&console_srcu);
 
-	if (console->flags & CON_NBCON)
-		nbcon_free(console);
-
-	console_sysfs_notify();
-
-	if (console->exit)
-		res = console->exit(console);
-
 	/*
 	 * With this console gone, the global flags tracking registered
 	 * console types may have changed. Update them.
@@ -4232,6 +4225,15 @@ static int unregister_console_locked(struct console *console)
 	if (!found_nbcon_con)
 		have_nbcon_console = found_nbcon_con;
 
+	/* @have_nbcon_console must be updated before calling nbcon_free(). */
+	if (console->flags & CON_NBCON)
+		nbcon_free(console);
+
+	console_sysfs_notify();
+
+	if (console->exit)
+		res = console->exit(console);
+
 	/* Changed console list, may require printer threads to start/stop. */
 	printk_kthreads_check_locked();