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Message-ID: <201609011917.dCn6fO6g%fengguang.wu@intel.com>
Date: Thu, 1 Sep 2016 19:18:17 +0800
From: kbuild test robot <lkp@...el.com>
To: Stanislaw Gruszka <sgruszka@...hat.com>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org,
Giovanni Gherdovich <ggherdovich@...e.cz>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Mel Gorman <mgorman@...hsingularity.net>,
Mike Galbraith <mgalbraith@...e.de>,
Paolo Bonzini <pbonzini@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Rik van Riel <riel@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Wanpeng Li <wanpeng.li@...mail.com>,
Ingo Molnar <mingo@...nel.org>,
Stanislaw Gruszka <sgruszka@...hat.com>
Subject: Re: [PATCH 1/3] sched/cputime: Improve scalability of
times()/clock_gettime() on 32 bit cpus
Hi Stanislaw,
[auto build test WARNING on tip/sched/core]
[also build test WARNING on next-20160825]
[cannot apply to v4.8-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]
url: https://github.com/0day-ci/linux/commits/Stanislaw-Gruszka/sched-cputime-sum_exec_runtime-fixes-for-32-bit-cpus/20160901-173835
config: i386-randconfig-x014-201635 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/uapi/linux/capability.h:16,
from include/linux/capability.h:15,
from include/linux/sched.h:15,
from include/linux/kasan.h:4,
from kernel/sched/core.c:29:
kernel/sched/core.c: In function 'update_sched_runtime':
kernel/sched/core.c:3013:8: error: 'struct task_struct' has no member named 'on_cpu'; did you mean 'on_rq'?
if (!p->on_cpu || !task_on_rq_queued(p))
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> kernel/sched/core.c:3013:2: note: in expansion of macro 'if'
if (!p->on_cpu || !task_on_rq_queued(p))
^~
kernel/sched/core.c:3013:8: error: 'struct task_struct' has no member named 'on_cpu'; did you mean 'on_rq'?
if (!p->on_cpu || !task_on_rq_queued(p))
^
include/linux/compiler.h:149:42: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> kernel/sched/core.c:3013:2: note: in expansion of macro 'if'
if (!p->on_cpu || !task_on_rq_queued(p))
^~
kernel/sched/core.c:3013:8: error: 'struct task_struct' has no member named 'on_cpu'; did you mean 'on_rq'?
if (!p->on_cpu || !task_on_rq_queued(p))
^
include/linux/compiler.h:160:16: note: in definition of macro '__trace_if'
______r = !!(cond); \
^~~~
>> kernel/sched/core.c:3013:2: note: in expansion of macro 'if'
if (!p->on_cpu || !task_on_rq_queued(p))
^~
vim +/if +3013 kernel/sched/core.c
d6a8f295 kernel/sched/core.c Stanislaw Gruszka 2016-09-01 2997 void update_sched_runtime(struct task_struct *p)
c5f8d995 kernel/sched.c Hidetoshi Seto 2009-03-31 2998 {
eb580751 kernel/sched/core.c Peter Zijlstra 2015-07-31 2999 struct rq_flags rf;
c5f8d995 kernel/sched.c Hidetoshi Seto 2009-03-31 3000 struct rq *rq;
c5f8d995 kernel/sched.c Hidetoshi Seto 2009-03-31 3001
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3002 /*
d6a8f295 kernel/sched/core.c Stanislaw Gruszka 2016-09-01 3003 * Optimization to to avoid taking task lock.
d6a8f295 kernel/sched/core.c Stanislaw Gruszka 2016-09-01 3004 *
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3005 * Reading ->on_cpu is racy, but this is ok.
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3006 *
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3007 * If we race with it leaving cpu, we'll take a lock. So we're correct.
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3008 * If we race with it entering cpu, unaccounted time is 0. This is
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3009 * indistinguishable from the read occurring a few cycles earlier.
4036ac15 kernel/sched/core.c Mike Galbraith 2014-06-24 3010 * If we see ->on_cpu without ->on_rq, the task is leaving, and has
4036ac15 kernel/sched/core.c Mike Galbraith 2014-06-24 3011 * been accounted, so we're correct here as well.
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3012 */
da0c1e65 kernel/sched/core.c Kirill Tkhai 2014-08-20 @3013 if (!p->on_cpu || !task_on_rq_queued(p))
d6a8f295 kernel/sched/core.c Stanislaw Gruszka 2016-09-01 3014 return;
911b2898 kernel/sched/core.c Peter Zijlstra 2013-11-11 3015
eb580751 kernel/sched/core.c Peter Zijlstra 2015-07-31 3016 rq = task_rq_lock(p, &rf);
6e998916 kernel/sched/core.c Stanislaw Gruszka 2014-11-12 3017 /*
6e998916 kernel/sched/core.c Stanislaw Gruszka 2014-11-12 3018 * Must be ->curr _and_ ->on_rq. If dequeued, we would
6e998916 kernel/sched/core.c Stanislaw Gruszka 2014-11-12 3019 * project cycles that may never be accounted to this
6e998916 kernel/sched/core.c Stanislaw Gruszka 2014-11-12 3020 * thread, breaking clock_gettime().
6e998916 kernel/sched/core.c Stanislaw Gruszka 2014-11-12 3021 */
:::::: The code at line 3013 was first introduced by commit
:::::: da0c1e65b51a289540159663aa4b90ba2366bc21 sched: Add wrapper for checking task_struct::on_rq
:::::: TO: Kirill Tkhai <ktkhai@...allels.com>
:::::: CC: Ingo Molnar <mingo@...nel.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
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