1 files changed, 0 insertions, 125 deletions
diff --git a/debian/patches-rt/0024-printk-nbcon-Add-unsafe-flushing-on-panic.patch b/debian/patches-rt/0024-printk-nbcon-Add-unsafe-flushing-on-panic.patch
deleted file mode 100644
index a63a8ac515..0000000000
--- a/debian/patches-rt/0024-printk-nbcon-Add-unsafe-flushing-on-panic.patch
+++ /dev/null
@@ -1,125 +0,0 @@
-From: John Ogness <john.ogness@linutronix.de>
-Date: Fri, 20 Oct 2023 10:03:42 +0000
-Subject: [PATCH 24/48] printk: nbcon: Add unsafe flushing on panic
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.8/older/patches-6.8.2-rt11.tar.xz
-
-Add nbcon_atomic_flush_unsafe() to flush all nbcon consoles
-using the write_atomic() callback and allowing unsafe hostile
-takeovers. Call this at the end of panic() as a final attempt
-to flush any pending messages.
-
-Note that legacy consoles use unsafe methods for flushing
-from the beginning of panic (see bust_spinlocks()). Therefore,
-systems using both legacy and nbcon consoles may still fail to
-see panic messages due to unsafe legacy console usage.
-
-Signed-off-by: John Ogness <john.ogness@linutronix.de>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- include/linux/printk.h |    5 +++++
- kernel/panic.c         |    1 +
- kernel/printk/nbcon.c  |   26 +++++++++++++++++++++-----
- 3 files changed, 27 insertions(+), 5 deletions(-)
-
---- a/include/linux/printk.h
-+++ b/include/linux/printk.h
-@@ -197,6 +197,7 @@ extern asmlinkage void dump_stack(void)
- void printk_trigger_flush(void);
- extern void nbcon_driver_acquire(struct console *con);
- extern void nbcon_driver_release(struct console *con);
-+void nbcon_atomic_flush_unsafe(void);
- #else
- static inline __printf(1, 0)
- int vprintk(const char *s, va_list args)
-@@ -285,6 +286,10 @@ static inline void nbcon_driver_release(
- {
- }
- 
-+static inline void nbcon_atomic_flush_unsafe(void)
-+{
-+}
-+
- #endif
- 
- bool this_cpu_in_panic(void);
---- a/kernel/panic.c
-+++ b/kernel/panic.c
-@@ -453,6 +453,7 @@ void panic(const char *fmt, ...)
- 	 * Explicitly flush the kernel log buffer one last time.
- 	 */
- 	console_flush_on_panic(CONSOLE_FLUSH_PENDING);
-+	nbcon_atomic_flush_unsafe();
- 
- 	local_irq_enable();
- 	for (i = 0; ; i += PANIC_TIMER_STEP) {
---- a/kernel/printk/nbcon.c
-+++ b/kernel/printk/nbcon.c
-@@ -1033,6 +1033,7 @@ bool nbcon_legacy_emit_next_record(struc
-  *					write_atomic() callback
-  * @con:			The nbcon console to flush
-  * @stop_seq:			Flush up until this record
-+ * @allow_unsafe_takeover:	True, to allow unsafe hostile takeovers
-  *
-  * Return:	True if taken over while printing. Otherwise false.
-  *
-@@ -1041,7 +1042,8 @@ bool nbcon_legacy_emit_next_record(struc
-  * there are no more records available to read or this context is not allowed
-  * to acquire the console.
-  */
--static bool __nbcon_atomic_flush_pending_con(struct console *con, u64 stop_seq)
-+static bool __nbcon_atomic_flush_pending_con(struct console *con, u64 stop_seq,
-+					     bool allow_unsafe_takeover)
- {
- 	struct nbcon_write_context wctxt = { };
- 	struct nbcon_context *ctxt = &ACCESS_PRIVATE(&wctxt, ctxt);
-@@ -1049,6 +1051,7 @@ static bool __nbcon_atomic_flush_pending
- 	ctxt->console			= con;
- 	ctxt->spinwait_max_us		= 2000;
- 	ctxt->prio			= nbcon_get_default_prio();
-+	ctxt->allow_unsafe_takeover	= allow_unsafe_takeover;
- 
- 	if (!nbcon_context_try_acquire(ctxt))
- 		return false;
-@@ -1075,8 +1078,9 @@ static bool __nbcon_atomic_flush_pending
-  * __nbcon_atomic_flush_pending - Flush all nbcon consoles using their
-  *					write_atomic() callback
-  * @stop_seq:			Flush up until this record
-+ * @allow_unsafe_takeover:	True, to allow unsafe hostile takeovers
-  */
--static void __nbcon_atomic_flush_pending(u64 stop_seq)
-+static void __nbcon_atomic_flush_pending(u64 stop_seq, bool allow_unsafe_takeover)
- {
- 	struct console *con;
- 	bool should_retry;
-@@ -1109,8 +1113,8 @@ static void __nbcon_atomic_flush_pending
- 			 */
- 			local_irq_save(irq_flags);
- 
--			should_retry |= __nbcon_atomic_flush_pending_con(con, stop_seq);
--
-+			should_retry |= __nbcon_atomic_flush_pending_con(con, stop_seq,
-+									 allow_unsafe_takeover);
- 			local_irq_restore(irq_flags);
- 		}
- 		console_srcu_read_unlock(cookie);
-@@ -1127,7 +1131,19 @@ static void __nbcon_atomic_flush_pending
-  */
- void nbcon_atomic_flush_pending(void)
- {
--	__nbcon_atomic_flush_pending(prb_next_reserve_seq(prb));
-+	__nbcon_atomic_flush_pending(prb_next_reserve_seq(prb), false);
-+}
-+
-+/**
-+ * nbcon_atomic_flush_unsafe - Flush all nbcon consoles using their
-+ *	write_atomic() callback and allowing unsafe hostile takeovers
-+ *
-+ * Flush the backlog up through the currently newest record. Unsafe hostile
-+ * takeovers will be performed, if necessary.
-+ */
-+void nbcon_atomic_flush_unsafe(void)
-+{
-+	__nbcon_atomic_flush_pending(prb_next_reserve_seq(prb), true);
- }
- 
- /**