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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-21 09:34:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-21 09:34:29 -0700 |
| commit | 56c1e8343494f0a315c99964ea1a952478394a8d (patch) | |
| tree | 174cc3f4782d00fe0f8e47bff1ae8102d26cdccc /Documentation | |
| parent | f97c81dc6ca5996560b3944064f63fc87eb18d00 (diff) | |
| parent | ae88de56a1893bdccc7b5af8c12556de649d675e (diff) | |
Merge tag 'printk-for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
Pull printk updates from Petr Mladek:
- Fix off-by-one error when calculating messages that might fit into
kmsg buffer. It causes occasional omitting of the last message.
- Add missing pointer check in %pD format modifier handling.
- Some clean up
* tag 'printk-for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
ABI: Update dev-kmsg documentation to match current kernel behaviour
printk: Replace strncmp() with str_has_prefix()
lib/test_printf: Remove obvious comments from %pd and %pD tests
lib/test_printf: Add test of null/invalid pointer dereference for dentry
vsprintf: Prevent crash when dereferencing invalid pointers for %pD
printk: Do not lose last line in kmsg buffer dump
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/dev-kmsg | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/Documentation/ABI/testing/dev-kmsg b/Documentation/ABI/testing/dev-kmsg index fff817efa508..f307506eb54c 100644 --- a/Documentation/ABI/testing/dev-kmsg +++ b/Documentation/ABI/testing/dev-kmsg @@ -12,7 +12,7 @@ Description: The /dev/kmsg character device node provides userspace access The logged line can be prefixed with a <N> syslog prefix, which carries the syslog priority and facility. The single decimal prefix number is composed of the 3 lowest bits being the syslog - priority and the higher bits the syslog facility number. + priority and the next 8 bits the syslog facility number. If no prefix is given, the priority number is the default kernel log priority and the facility number is set to LOG_USER (1). It @@ -90,13 +90,12 @@ Description: The /dev/kmsg character device node provides userspace access +sound:card0 - subsystem:devname The flags field carries '-' by default. A 'c' indicates a - fragment of a line. All following fragments are flagged with - '+'. Note, that these hints about continuation lines are not - necessarily correct, and the stream could be interleaved with - unrelated messages, but merging the lines in the output - usually produces better human readable results. A similar - logic is used internally when messages are printed to the - console, /proc/kmsg or the syslog() syscall. + fragment of a line. Note, that these hints about continuation + lines are not necessarily correct, and the stream could be + interleaved with unrelated messages, but merging the lines in + the output usually produces better human readable results. A + similar logic is used internally when messages are printed to + the console, /proc/kmsg or the syslog() syscall. By default, kernel tries to avoid fragments by concatenating when it can and fragments are rare; however, when extended |