diff options
Diffstat (limited to 'kernel/printk/internal.h')
| -rw-r--r-- | kernel/printk/internal.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h index a96d4114a1db..8166e24f8780 100644 --- a/kernel/printk/internal.h +++ b/kernel/printk/internal.h @@ -113,6 +113,13 @@ static inline bool console_is_usable(struct console *con, short flags, bool use_ /* The write_atomic() callback is optional. */ if (use_atomic && !con->write_atomic) return false; + + /* + * For the !use_atomic case, @printk_kthreads_running is not + * checked because the write_thread() callback is also used + * via the legacy loop when the printer threads are not + * available. + */ } else { if (!con->write) return false; @@ -176,6 +183,7 @@ static inline void nbcon_atomic_flush_pending(void) { } static inline bool nbcon_legacy_emit_next_record(struct console *con, bool *handover, int cookie, bool use_atomic) { return false; } static inline void nbcon_kthread_wake(struct console *con) { } +static inline void nbcon_kthreads_wake(void) { } static inline bool console_is_usable(struct console *con, short flags, bool use_atomic) { return false; } @@ -190,6 +198,7 @@ extern bool legacy_allow_panic_sync; /** * struct console_flush_type - Define available console flush methods * @nbcon_atomic: Flush directly using nbcon_atomic() callback + * @nbcon_offload: Offload flush to printer thread * @legacy_direct: Call the legacy loop in this context * @legacy_offload: Offload the legacy loop into IRQ * @@ -197,6 +206,7 @@ extern bool legacy_allow_panic_sync; */ struct console_flush_type { bool nbcon_atomic; + bool nbcon_offload; bool legacy_direct; bool legacy_offload; }; @@ -211,6 +221,22 @@ static inline void printk_get_console_flush_type(struct console_flush_type *ft) switch (nbcon_get_default_prio()) { case NBCON_PRIO_NORMAL: + if (have_nbcon_console && !have_boot_console) { + if (printk_kthreads_running) + ft->nbcon_offload = true; + else + ft->nbcon_atomic = true; + } + + /* Legacy consoles are flushed directly when possible. */ + if (have_legacy_console || have_boot_console) { + if (!is_printk_legacy_deferred()) + ft->legacy_direct = true; + else + ft->legacy_offload = true; + } + break; + case NBCON_PRIO_EMERGENCY: if (have_nbcon_console && !have_boot_console) ft->nbcon_atomic = true; |