diff options
Diffstat (limited to 'debian/patches-rt/0002-serial-core-Use-lock-wrappers.patch')
| -rw-r--r-- | debian/patches-rt/0002-serial-core-Use-lock-wrappers.patch | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/debian/patches-rt/0002-serial-core-Use-lock-wrappers.patch b/debian/patches-rt/0002-serial-core-Use-lock-wrappers.patch deleted file mode 100644 index ad41a3dc78..0000000000 --- a/debian/patches-rt/0002-serial-core-Use-lock-wrappers.patch +++ /dev/null @@ -1,93 +0,0 @@ -From: Thomas Gleixner <tglx@linutronix.de> -Date: Thu, 14 Sep 2023 20:43:19 +0206 -Subject: [PATCH 002/134] serial: core: Use lock wrappers -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit -Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz - -When a serial port is used for kernel console output, then all -modifications to the UART registers which are done from other contexts, -e.g. getty, termios, are interference points for the kernel console. - -So far this has been ignored and the printk output is based on the -principle of hope. The rework of the console infrastructure which aims to -support threaded and atomic consoles, requires to mark sections which -modify the UART registers as unsafe. This allows the atomic write function -to make informed decisions and eventually to restore operational state. It -also allows to prevent the regular UART code from modifying UART registers -while printk output is in progress. - -All modifications of UART registers are guarded by the UART port lock, -which provides an obvious synchronization point with the console -infrastructure. - -To avoid adding this functionality to all UART drivers, wrap the -spin_[un]lock*() invocations for uart_port::lock into helper functions -which just contain the spin_[un]lock*() invocations for now. In a -subsequent step these helpers will gain the console synchronization -mechanisms. - -Converted with coccinelle. No functional change. - -Signed-off-by: Thomas Gleixner <tglx@linutronix.de> -Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> -Signed-off-by: John Ogness <john.ogness@linutronix.de> -Link: https://lore.kernel.org/r/20230914183831.587273-3-john.ogness@linutronix.de -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> ---- - include/linux/serial_core.h | 12 ++++++------ - 1 file changed, 6 insertions(+), 6 deletions(-) - ---- a/include/linux/serial_core.h -+++ b/include/linux/serial_core.h -@@ -1035,14 +1035,14 @@ static inline void uart_unlock_and_check - u8 sysrq_ch; - - if (!port->has_sysrq) { -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - return; - } - - sysrq_ch = port->sysrq_ch; - port->sysrq_ch = 0; - -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - - if (sysrq_ch) - handle_sysrq(sysrq_ch); -@@ -1054,14 +1054,14 @@ static inline void uart_unlock_and_check - u8 sysrq_ch; - - if (!port->has_sysrq) { -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - return; - } - - sysrq_ch = port->sysrq_ch; - port->sysrq_ch = 0; - -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - - if (sysrq_ch) - handle_sysrq(sysrq_ch); -@@ -1077,12 +1077,12 @@ static inline int uart_prepare_sysrq_cha - } - static inline void uart_unlock_and_check_sysrq(struct uart_port *port) - { -- spin_unlock(&port->lock); -+ uart_port_unlock(port); - } - static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port, - unsigned long flags) - { -- spin_unlock_irqrestore(&port->lock, flags); -+ uart_port_unlock_irqrestore(port, flags); - } - #endif /* CONFIG_MAGIC_SYSRQ_SERIAL */ - |