diff options
Diffstat (limited to 'debian/patches-rt/0017-printk-nbcon-Add-helper-to-assign-priority-based-on-.patch')
| -rw-r--r-- | debian/patches-rt/0017-printk-nbcon-Add-helper-to-assign-priority-based-on-.patch | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/debian/patches-rt/0017-printk-nbcon-Add-helper-to-assign-priority-based-on-.patch b/debian/patches-rt/0017-printk-nbcon-Add-helper-to-assign-priority-based-on-.patch new file mode 100644 index 0000000000..a7cb342ff6 --- /dev/null +++ b/debian/patches-rt/0017-printk-nbcon-Add-helper-to-assign-priority-based-on-.patch @@ -0,0 +1,67 @@ +From: John Ogness <john.ogness@linutronix.de> +Date: Thu, 14 Dec 2023 14:38:42 +0000 +Subject: [PATCH 17/48] printk: nbcon: Add helper to assign priority based on + CPU state +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.10/older/patches-6.10.2-rt14.tar.xz + +Add a helper function to use the current state of the CPU to +determine which priority to assign to the printing context. + +The EMERGENCY priority handling is added in a follow-up commit. +It will use a per-CPU variable. + +Note: nbcon_device_try_acquire(), which is used by console + drivers to acquire the nbcon console for non-printing + activities, will always use NORMAL priority. + +Signed-off-by: John Ogness <john.ogness@linutronix.de> +Reviewed-by: Petr Mladek <pmladek@suse.com> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/printk/internal.h | 2 ++ + kernel/printk/nbcon.c | 16 ++++++++++++++++ + 2 files changed, 18 insertions(+) + +--- a/kernel/printk/internal.h ++++ b/kernel/printk/internal.h +@@ -84,6 +84,7 @@ void nbcon_seq_force(struct console *con + bool nbcon_alloc(struct console *con); + void nbcon_init(struct console *con, u64 init_seq); + void nbcon_free(struct console *con); ++enum nbcon_prio nbcon_get_default_prio(void); + + /* + * Check if the given console is currently capable and allowed to print +@@ -138,6 +139,7 @@ static inline void nbcon_seq_force(struc + static inline bool nbcon_alloc(struct console *con) { return false; } + static inline void nbcon_init(struct console *con, u64 init_seq) { } + static inline void nbcon_free(struct console *con) { } ++static inline enum nbcon_prio nbcon_get_default_prio(void) { return NBCON_PRIO_NONE; } + + static inline bool console_is_usable(struct console *con, short flags) { return false; } + +--- a/kernel/printk/nbcon.c ++++ b/kernel/printk/nbcon.c +@@ -938,6 +938,22 @@ static bool nbcon_emit_next_record(struc + } + + /** ++ * nbcon_get_default_prio - The appropriate nbcon priority to use for nbcon ++ * printing on the current CPU ++ * ++ * Context: Any context which could not be migrated to another CPU. ++ * Return: The nbcon_prio to use for acquiring an nbcon console in this ++ * context for printing. ++ */ ++enum nbcon_prio nbcon_get_default_prio(void) ++{ ++ if (this_cpu_in_panic()) ++ return NBCON_PRIO_PANIC; ++ ++ return NBCON_PRIO_NORMAL; ++} ++ ++/** + * nbcon_alloc - Allocate buffers needed by the nbcon console + * @con: Console to allocate buffers for + * |