diff options
Diffstat (limited to 'kernel/printk/internal.h')
| -rw-r--r-- | kernel/printk/internal.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h index d947ca6c84f9..2a17704136f1 100644 --- a/kernel/printk/internal.h +++ b/kernel/printk/internal.h @@ -14,6 +14,21 @@ int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, #ifdef CONFIG_PRINTK +#ifdef CONFIG_PRINTK_CALLER +#define PRINTK_PREFIX_MAX 48 +#else +#define PRINTK_PREFIX_MAX 32 +#endif + +/* + * the maximum size of a formatted record (i.e. with prefix added + * per line and dropped messages or in extended message format) + */ +#define PRINTK_MESSAGE_MAX 2048 + +/* the maximum size allowed to be reserved for a record */ +#define PRINTKRB_RECORD_MAX 1024 + /* Flags for a single printk record. */ enum printk_info_flags { LOG_NEWLINE = 2, /* text ended with a newline */ @@ -48,6 +63,10 @@ u16 printk_parse_prefix(const char *text, int *level, enum printk_info_flags *flags); #else +#define PRINTK_PREFIX_MAX 0 +#define PRINTK_MESSAGE_MAX 0 +#define PRINTKRB_RECORD_MAX 0 + /* * In !PRINTK builds we still export console_sem * semaphore and some of console functions (console_unlock()/etc.), so @@ -58,3 +77,29 @@ u16 printk_parse_prefix(const char *text, int *level, static inline bool printk_percpu_data_ready(void) { return false; } #endif /* CONFIG_PRINTK */ + +/** + * struct printk_buffers - Buffers to read/format/output printk messages. + * @outbuf: After formatting, contains text to output. + * @scratchbuf: Used as temporary ringbuffer reading and string-print space. + */ +struct printk_buffers { + char outbuf[PRINTK_MESSAGE_MAX]; + char scratchbuf[PRINTKRB_RECORD_MAX]; +}; + +/** + * struct printk_message - Container for a prepared printk message. + * @pbufs: printk buffers used to prepare the message. + * @outbuf_len: The length of prepared text in @pbufs->outbuf to output. This + * does not count the terminator. A value of 0 means there is + * nothing to output and this record should be skipped. + * @seq: The sequence number of the record used for @pbufs->outbuf. + * @dropped: The number of dropped records from reading @seq. + */ +struct printk_message { + struct printk_buffers *pbufs; + unsigned int outbuf_len; + u64 seq; + unsigned long dropped; +}; |