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Printk changes for 5.8

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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
This commit is contained in:
Linus Torvalds 2020-06-01 12:13:30 -07:00
commit ca1f5df23f
10 changed files with 163 additions and 85 deletions
Download patch file Download diff file Expand all files Collapse all files

22
Documentation/core-api/printk-formats.rst
View file

@ -482,21 +482,23 @@ Examples (OF)::
%pfwf /ocp@68000000/i2c@48072000/camera@10/port/endpoint - Full name
%pfwP endpoint - Node name
Time and date (struct rtc_time)
-------------------------------
Time and date
-------------
::
%ptR YYYY-mm-ddTHH:MM:SS
%ptRd YYYY-mm-dd
%ptRt HH:MM:SS
%ptR[dt][r]
%pt[RT] YYYY-mm-ddTHH:MM:SS
%pt[RT]d YYYY-mm-dd
%pt[RT]t HH:MM:SS
%pt[RT][dt][r]
For printing date and time as represented by struct rtc_time structure in
human readable format.
For printing date and time as represented by
R struct rtc_time structure
T time64_t type
in human readable format.
By default year will be incremented by 1900 and month by 1. Use %ptRr (raw)
to suppress this behaviour.
By default year will be incremented by 1900 and month by 1.
Use %pt[RT]r (raw) to suppress this behaviour.
Passed by reference.