linux-kernel - Re: [PATCH v1 1/2] tracing: Improve design of preemptirq tracepoints and its users

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Date:   Thu, 15 Mar 2018 13:19:54 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zilstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v1 1/2] tracing: Improve design of preemptirq tracepoints
 and its users

Hello,

On Thu, Mar 15, 2018 at 12:51 PM, kbuild test robot <lkp@...el.com> wrote:
>
> Hi Joel,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.16-rc5 next-20180315]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Joel-Fernandes/tracing-Improve-design-of-preemptirq-tracepoints-and-its-users/20180316-012211
> config: i386-randconfig-x006-201810 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386
>
> All errors (new ones prefixed by >>):
>
>    kernel//locking/lockdep.c: In function 'lockdep_init':
> >> kernel//locking/lockdep.c:4325:2: error: implicit declaration of function 'register_trace_irq_disable'; did you mean 'trace_irq_disable'? [-Werror=implicit-function-declaration]
>      register_trace_irq_disable(lockdep_hardirqs_off, NULL);
>      ^~~~~~~~~~~~~~~~~~~~~~~~~~

The reason for this is PREEMPTIRQ_TRACEPOINTS depends on FTRACE which
is turned off in the config. Its a combination I hadn't tested in my
matrix. It causes build errors in in lockdep code that tries to
register the lockdep hooks. I'll fix it in the next rev. Thanks.

- Joel