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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-01 22:13:30 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-01 22:13:30 +0300
commitca1f5df23f28228c46aa45d934abad38c6b6ff2e (patch)
tree2a104624002b3c78fee0f0efc5a29150d6292206 /Documentation/ABI
parent4d67829e11863072aec7cd1dd2939b1fd3eda17b (diff)
parent8b390ab725fddc443bb0082a6c67e82e25bfba7e (diff)
downloadlinux-ca1f5df23f28228c46aa45d934abad38c6b6ff2e.tar.xz
Merge tag 'printk-for-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
Pull printk updates from Petr Mladek: - Benjamin Herrenschmidt solved a problem with non-matched console aliases by first checking consoles defined on the command line. It is a more conservative approach than the previous attempts. - Benjamin also made sure that the console accessible via /dev/console always has CON_CONSDEV flag. - Andy Shevchenko added the %ptT modifier for printing struct time64_t. It extends the existing %ptR handling for struct rtc_time. - Bruno Meneguele fixed /dev/kmsg error value returned by unsupported SEEK_CUR. - Tetsuo Handa removed unused pr_cont_once(). ... and a few small fixes. * tag 'printk-for-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printk: Remove pr_cont_once() printk: handle blank console arguments passed in. kernel/printk: add kmsg SEEK_CUR handling printk: Fix a typo in comment "interator"->"iterator" usb: pulse8-cec: Switch to use %ptT ARM: bcm2835: Switch to use %ptT lib/vsprintf: Print time64_t in human readable format lib/vsprintf: update comment about simple_strto<foo>() functions printk: Correctly set CON_CONSDEV even when preferred console was not registered printk: Fix preferred console selection with multiple matches printk: Move console matching logic into a separate function printk: Convert a use of sprintf to snprintf in console_unlock
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/dev-kmsg5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/dev-kmsg b/Documentation/ABI/testing/dev-kmsg
index f307506eb54c..1e6c28b1942b 100644
--- a/Documentation/ABI/testing/dev-kmsg
+++ b/Documentation/ABI/testing/dev-kmsg
@@ -56,6 +56,11 @@ Description: The /dev/kmsg character device node provides userspace access
seek after the last record available at the time
the last SYSLOG_ACTION_CLEAR was issued.
+ Due to the record nature of this interface with a "read all"
+ behavior and the specific positions each seek operation sets,
+ SEEK_CUR is not supported, returning -ESPIPE (invalid seek) to
+ errno whenever requested.
+
The output format consists of a prefix carrying the syslog
prefix including priority and facility, the 64 bit message
sequence number and the monotonic timestamp in microseconds,