linux-kernel - Re: [PATCH RESEND v3 1/2] selftests/resctrl: Fix schemata write error check

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Date:   Tue, 12 Sep 2023 09:00:28 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>
CC:     Fenghua Yu <fenghua.yu@...el.com>, Shuah Khan <shuah@...nel.org>,
        <ilpo.jarvinen@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH RESEND v3 1/2] selftests/resctrl: Fix schemata write error
 check

Hi Maciej,

On 9/11/2023 11:32 PM, Maciej Wieczór-Retman wrote:
> On 2023-09-11 at 09:59:06 -0700, Reinette Chatre wrote:
>> Hi Maciej,
>> When I build the tests with this applied I encounter the following:
>>
>> resctrlfs.c: In function ‘write_schemata’:
>> resctrlfs.c:475:14: warning: implicit declaration of function ‘open’; did you mean ‘popen’? [-Wimplicit-function-declaration]
>>  475 |         fd = open(controlgroup, O_WRONLY);
>>      |              ^~~~
>>      |              popen
>> resctrlfs.c:475:33: error: ‘O_WRONLY’ undeclared (first use in this function)
>>  475 |         fd = open(controlgroup, O_WRONLY);
>>      |                                 ^~~~~~~~
>> resctrlfs.c:475:33: note: each undeclared identifier is reported only once for each function it appears in
> 
> Hmm, that's odd. How do you build the tests?

I applied this series on top of kselftest repo's "next" branch.

I use a separate build directory and first ran "make headers". After that,
$ make O=<build dir> -C tools/testing/selftests/resctrl

> I use "make -C tools/testing/selftests/resctrl" while in the root kernel
> source directory. I tried to get the same error you experienced by
> compiling some dummy test program with "open" and "O_WRONLY". From the
> experiment I found that the "resctrl.h" header provides the declarations
> that are causing your errors.

>From what I can tell resctrl.h does not include fcntl.h that provides
what is needed.

Reinette