diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/printk/printk.c | 124 |
1 files changed, 65 insertions, 59 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 1d1513215c22..9a63aeeaaf5d 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -349,7 +349,7 @@ static int console_msg_format = MSG_FORMAT_DEFAULT; */ enum log_flags { - LOG_NOCONS = 1, /* already flushed, do not print to console */ + LOG_NOCONS = 1, /* suppress print, do not print to console */ LOG_NEWLINE = 2, /* text ended with a newline */ LOG_PREFIX = 4, /* text started with a prefix */ LOG_CONT = 8, /* text is a fragment of a continuation line */ @@ -1352,71 +1352,68 @@ static int syslog_print_all(char __user *buf, int size, bool clear) { char *text; int len = 0; + u64 next_seq; + u64 seq; + u32 idx; text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL); if (!text) return -ENOMEM; logbuf_lock_irq(); - if (buf) { - u64 next_seq; - u64 seq; - u32 idx; + /* + * Find first record that fits, including all following records, + * into the user-provided buffer for this dump. + */ + seq = clear_seq; + idx = clear_idx; + while (seq < log_next_seq) { + struct printk_log *msg = log_from_idx(idx); - /* - * Find first record that fits, including all following records, - * into the user-provided buffer for this dump. - */ - seq = clear_seq; - idx = clear_idx; - while (seq < log_next_seq) { - struct printk_log *msg = log_from_idx(idx); - - len += msg_print_text(msg, true, NULL, 0); - idx = log_next(idx); - seq++; - } + len += msg_print_text(msg, true, NULL, 0); + idx = log_next(idx); + seq++; + } - /* move first record forward until length fits into the buffer */ - seq = clear_seq; - idx = clear_idx; - while (len > size && seq < log_next_seq) { - struct printk_log *msg = log_from_idx(idx); + /* move first record forward until length fits into the buffer */ + seq = clear_seq; + idx = clear_idx; + while (len > size && seq < log_next_seq) { + struct printk_log *msg = log_from_idx(idx); - len -= msg_print_text(msg, true, NULL, 0); - idx = log_next(idx); - seq++; - } + len -= msg_print_text(msg, true, NULL, 0); + idx = log_next(idx); + seq++; + } + + /* last message fitting into this dump */ + next_seq = log_next_seq; - /* last message fitting into this dump */ - next_seq = log_next_seq; + len = 0; + while (len >= 0 && seq < next_seq) { + struct printk_log *msg = log_from_idx(idx); + int textlen; - len = 0; - while (len >= 0 && seq < next_seq) { - struct printk_log *msg = log_from_idx(idx); - int textlen; + textlen = msg_print_text(msg, true, text, + LOG_LINE_MAX + PREFIX_MAX); + if (textlen < 0) { + len = textlen; + break; + } + idx = log_next(idx); + seq++; - textlen = msg_print_text(msg, true, text, - LOG_LINE_MAX + PREFIX_MAX); - if (textlen < 0) { - len = textlen; - break; - } - idx = log_next(idx); - seq++; + logbuf_unlock_irq(); + if (copy_to_user(buf + len, text, textlen)) + len = -EFAULT; + else + len += textlen; + logbuf_lock_irq(); - logbuf_unlock_irq(); - if (copy_to_user(buf + len, text, textlen)) - len = -EFAULT; - else - len += textlen; - logbuf_lock_irq(); - - if (seq < log_first_seq) { - /* messages are gone, move to next one */ - seq = log_first_seq; - idx = log_first_idx; - } + if (seq < log_first_seq) { + /* messages are gone, move to next one */ + seq = log_first_seq; + idx = log_first_idx; } } @@ -1430,6 +1427,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear) return len; } +static void syslog_clear(void) +{ + logbuf_lock_irq(); + clear_seq = log_next_seq; + clear_idx = log_next_idx; + logbuf_unlock_irq(); +} + int do_syslog(int type, char __user *buf, int len, int source) { bool clear = false; @@ -1474,7 +1479,7 @@ int do_syslog(int type, char __user *buf, int len, int source) break; /* Clear ring buffer */ case SYSLOG_ACTION_CLEAR: - syslog_print_all(NULL, 0, true); + syslog_clear(); break; /* Disable logging to console */ case SYSLOG_ACTION_CONSOLE_OFF: @@ -1874,6 +1879,9 @@ int vprintk_store(int facility, int level, if (dict) lflags |= LOG_PREFIX|LOG_NEWLINE; + if (suppress_message_printing(level)) + lflags |= LOG_NOCONS; + return log_output(facility, level, lflags, dict, dictlen, text, text_len); } @@ -2022,7 +2030,6 @@ static void call_console_drivers(const char *ext_text, size_t ext_len, const char *text, size_t len) {} static size_t msg_print_text(const struct printk_log *msg, bool syslog, char *buf, size_t size) { return 0; } -static bool suppress_message_printing(int level) { return false; } #endif /* CONFIG_PRINTK */ @@ -2358,11 +2365,10 @@ skip: break; msg = log_from_idx(console_idx); - if (suppress_message_printing(msg->level)) { + if (msg->flags & LOG_NOCONS) { /* - * Skip record we have buffered and already printed - * directly to the console when we received it, and - * record that has level above the console loglevel. + * Skip record if !ignore_loglevel, and + * record has level above the console loglevel. */ console_idx = log_next(console_idx); console_seq++; |