diff options
| author | John Ogness <john.ogness@linutronix.de> | 2020-11-30 03:36:06 +0300 |
|---|---|---|
| committer | Minda Chen <minda.chen@starfivetech.com> | 2023-11-06 14:24:37 +0300 |
| commit | 69dbe75e276a599b0899f90c2af6e547dd81fd7e (patch) | |
| tree | c0bf6a80328b0ac64ed7030e480dc0d4eec933ef /include | |
| parent | 13f94a9f0bb8b7d4f85d08e0a08adbf2fb9f1201 (diff) | |
| download | linux-69dbe75e276a599b0899f90c2af6e547dd81fd7e.tar.xz | |
printk: introduce kernel sync mode
When the kernel performs an OOPS, enter into "sync mode":
- only atomic consoles (write_atomic() callback) will print
- printing occurs within vprintk_store() instead of console_unlock()
CONSOLE_LOG_MAX is moved to printk.h to support the per-console
buffer used in sync mode.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/console.h | 4 | ||||
| -rw-r--r-- | include/linux/printk.h | 6 |
2 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index b0e783248b20..4dd8b0ce417d 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -16,6 +16,7 @@ #include <linux/atomic.h> #include <linux/types.h> +#include <linux/printk.h> struct vc_data; struct console_font_op; @@ -150,6 +151,9 @@ struct console { short flags; short index; int cflag; +#ifdef CONFIG_PRINTK + char sync_buf[CONSOLE_LOG_MAX]; +#endif void *data; struct console *next; }; diff --git a/include/linux/printk.h b/include/linux/printk.h index 453458c722f5..fb82a5e15b9d 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -47,6 +47,12 @@ static inline const char *printk_skip_headers(const char *buffer) #define CONSOLE_EXT_LOG_MAX 8192 +/* + * The maximum size of a record formatted for console printing + * (i.e. with the prefix prepended to every line). + */ +#define CONSOLE_LOG_MAX 1024 + /* printk's without a loglevel use this.. */ #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT |