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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0104-printk-nbcon-Add-driver_enter-driver_exit-console-ca.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/debian/patches-rt/0104-printk-nbcon-Add-driver_enter-driver_exit-console-ca.patch b/debian/patches-rt/0104-printk-nbcon-Add-driver_enter-driver_exit-console-ca.patch new file mode 100644 index 000000000..d314cb53d --- /dev/null +++ b/debian/patches-rt/0104-printk-nbcon-Add-driver_enter-driver_exit-console-ca.patch @@ -0,0 +1,42 @@ +From: John Ogness <john.ogness@linutronix.de> +Date: Fri, 8 Dec 2023 15:54:27 +0000 +Subject: [PATCH 104/134] printk: nbcon: Add driver_enter/driver_exit console + callbacks +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz + +Console drivers need some mechanism to synchronize between "normal +driver activity" and console printing. For uart serial drivers it +is the port lock. Other types of console drivers (network, +graphics, USB) will need something as well. + +Provide 2 new mandatory nbcon console callbacks (driver_enter and +driver_exit) to allow the consoles drivers to implement the +appropriate synchronization. The callbacks are also expected to +disable/enable migration. + +Signed-off-by: John Ogness <john.ogness@linutronix.de> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + include/linux/console.h | 4 ++++ + 1 file changed, 4 insertions(+) + +--- a/include/linux/console.h ++++ b/include/linux/console.h +@@ -296,6 +296,8 @@ struct nbcon_write_context { + * @node: hlist node for the console list + * + * @write_atomic: Write callback for atomic context ++ * @driver_enter: Callback to begin synchronization with driver code ++ * @driver_exit: Callback to finish synchronization with driver code + * @nbcon_state: State for nbcon consoles + * @nbcon_seq: Sequence number of the next record for nbcon to print + * @pbufs: Pointer to nbcon private buffer +@@ -323,6 +325,8 @@ struct console { + /* nbcon console specific members */ + bool (*write_atomic)(struct console *con, + struct nbcon_write_context *wctxt); ++ void (*driver_enter)(struct console *con, unsigned long *flags); ++ void (*driver_exit)(struct console *con, unsigned long flags); + atomic_t __private nbcon_state; + atomic_long_t __private nbcon_seq; + struct printk_buffers *pbufs; |