linux.git/Documentation/timers, branch v4.19

timekeeping.txt: Correct maxCount of n-bit binary counter

2018-07-23T15:33:06+00:00

A n-bit binary counter can count a maximum of 2^n events and the count
value ranges from 0 to (2^n)-1

Signed-off-by: Siddaraju DH 
Signed-off-by: Jonathan Corbet

sched/isolation: Eliminate NO_HZ_FULL_ALL

2018-02-15T23:40:37+00:00

Commit 6f1982fedd59 ("sched/isolation: Handle the nohz_full= parameter")
broke CONFIG_NO_HZ_FULL_ALL=y kernels.  This breakage is due to the code
under CONFIG_NO_HZ_FULL_ALL failing to invoke the shiny new housekeeping
functions.  This means that rcutorture scenario TREE04 now emits RCU CPU
stall warnings due to the RCU grace-period kthreads not being awakened
at a time of their choosing, or perhaps even not at all:

[   27.731422] rcu_bh kthread starved for 21001 jiffies! g18446744073709551369 c18446744073709551368 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=3
[   27.731423] rcu_bh          I14936     9      2 0x80080000
[   27.731435] Call Trace:
[   27.731440]  __schedule+0x31a/0x6d0
[   27.731442]  schedule+0x31/0x80
[   27.731446]  schedule_timeout+0x15a/0x320
[   27.731453]  ? call_timer_fn+0x130/0x130
[   27.731457]  rcu_gp_kthread+0x66c/0xea0
[   27.731458]  ? rcu_gp_kthread+0x66c/0xea0

Because no one has complained about CONFIG_NO_HZ_FULL_ALL=y being broken,
I hypothesize that no one is in fact using it, other than rcutorture.
This commit therefore eliminates CONFIG_NO_HZ_FULL_ALL and updates
rcutorture's config files to instead use the nohz_full= kernel parameter
to put the desired CPUs into nohz_full mode.

Fixes: 6f1982fedd59 ("sched/isolation: Handle the nohz_full= parameter")

Reported-by: kernel test robot 
Signed-off-by: Paul E. McKenney 
Cc: Frederic Weisbecker 
Cc: Thomas Gleixner 
Cc: Chris Metcalf 
Cc: Christoph Lameter 
Cc: Linus Torvalds 
Cc: Luiz Capitulino 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Rik van Riel 
Cc: Wanpeng Li 
Cc: Ingo Molnar 
Cc: John Stultz 
Cc: Jonathan Corbet

docs: highres: fix broken urls

2017-09-26T20:58:23+00:00

Some urls is invalid. I find alternative urls.

Signed-off-by: stephen lu 
Signed-off-by: Jonathan Corbet

rcu: Eliminate NOCBs CPU-state Kconfig options

2017-06-09T01:52:43+00:00

The CONFIG_RCU_NOCB_CPU_ALL, CONFIG_RCU_NOCB_CPU_NONE, and
CONFIG_RCU_NOCB_CPU_ZERO Kconfig options are used only in testing and
are redundant with the rcu_nocbs= boot parameter.  This commit therefore
removes these three Kconfig options and adjusts the rcutorture scripts
to use the boot parameter instead.

Signed-off-by: Paul E. McKenney

time: Remove CONFIG_TIMER_STATS

2017-02-10T10:15:08+00:00

Currently CONFIG_TIMER_STATS exposes process information across namespaces:

kernel/time/timer_list.c print_timer():

        SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);

/proc/timer_list:

 #11: <0000000000000000>, hrtimer_wakeup, S:01, do_nanosleep, cron/2570

Given that the tracer can give the same information, this patch entirely
removes CONFIG_TIMER_STATS.

Suggested-by: Thomas Gleixner 
Signed-off-by: Kees Cook 
Acked-by: John Stultz 
Cc: Nicolas Pitre 
Cc: linux-doc@vger.kernel.org
Cc: Lai Jiangshan 
Cc: Shuah Khan 
Cc: Xing Gao 
Cc: Jonathan Corbet 
Cc: Jessica Frazelle 
Cc: kernel-hardening@lists.openwall.com
Cc: Nicolas Iooss 
Cc: "Paul E. McKenney" 
Cc: Petr Mladek 
Cc: Richard Cochran 
Cc: Tejun Heo 
Cc: Michal Marek 
Cc: Josh Poimboeuf 
Cc: Dmitry Vyukov 
Cc: Oleg Nesterov 
Cc: "Eric W. Biederman" 
Cc: Olof Johansson 
Cc: Andrew Morton 
Cc: linux-api@vger.kernel.org
Cc: Arjan van de Ven 
Link: http://lkml.kernel.org/r/20170208192659.GA32582@beast
Signed-off-by: Thomas Gleixner

Doc: update 00-INDEX files to reflect the runnable code move

2016-10-10T13:12:09+00:00

Update 00-INDEX files with the current file list to reflect the runnable
code move.

Acked-by: Michal Marek 
Acked-by: Jonathan Corbet 
Reviewed-by: Kees Cook 
Signed-off-by: Shuah Khan

samples: move timers example code from Documentation

2016-09-23T17:51:58+00:00

Move timers examples to samples and remove it from Documentation
Makefile. Create a new Makefile to build timers. It can be built
from top level directory or from timers directory:

Run make -C samples/timers or cd samples/timers; make

Acked-by: Jonathan Corbet 
Acked-by: Clemens Ladisch 
Signed-off-by: Shuah Khan

Documentation: fix common spelling mistakes

2016-04-28T13:51:59+00:00

This fixes several spelling mistakes in the Documentation/ tree, which
are caught by checkpatch.pl's spell checking.

Signed-off-by: Kees Cook 
Reviewed-by: Paul E. McKenney 
Acked-by: Randy Dunlap 
Signed-off-by: Jonathan Corbet

hrtimers: doc cleanup

2016-04-28T13:13:10+00:00

It has:
a tense correction(led->leads);
a typo(unevitably->inevitably);

Signed-off-by: Cao jin 
Signed-off-by: Jonathan Corbet

Merge tag 'docs-for-linus' of git://git.lwn.net/linux

2016-03-17T19:09:35+00:00

Pul documentation update from Jon Corbet:
 "Another relatively boring cycle for the docs tree: typo fixes,
  translation updates, etc"

* tag 'docs-for-linus' of git://git.lwn.net/linux:
  modsign: Fix documentation on module signing enforcement parameter.
  Doc: nfs: Fix typos in Documentation/filesystems/nfs
  Documentation: kselftest: Remove duplicate word
  doc: fix grammar
  Documentation: Howto: Fixed subtitles style
  Doc: ARM: Fix a typo in clksrc-change-registers.awk
  Documentation/ko_KR: update maintainer information
  Documentation: Fix int/unsigned int comparison
  Documentation: Chinese translation of arm64/silicon-errata.txt
  Documentation:Update Documentation/zh_CN/arm64/booting.txt
  Documentation: HOWTO: remove obsolete info about regression postings
  Doc: ja_JP: Fix a typo in HOWTO
  Doc: i2c: Fix typo in Documentation/i2c
  Doc: DocBook: Fix a typo in device-drivers.tmpl
  Remove "arch" usage in Documentation/features/list-arch.sh
  README: cosmetic fixes
  Documentation/CodingStyle: add space before parenthesis in example macro
  SubmittingPatches: fix spelling of "git send-email"