linux-kernel - Re: [PATCH v33 6/6] selftests: mm: add pagemap ioctl tests

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Date:   Thu, 2 Nov 2023 12:04:40 +0000
From:   Ryan Roberts <ryan.roberts@....com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Peter Xu <peterx@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michał Mirosław <emmir@...gle.com>,
        Andrei Vagin <avagin@...il.com>,
        Danylo Mocherniuk <mdanylo@...gle.com>,
        Paul Gofman <pgofman@...eweavers.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Yang Shi <shy828301@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Yun Zhou <yun.zhou@...driver.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Alex Sierra <alex.sierra@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        Greg KH <gregkh@...uxfoundation.org>, kernel@...labora.com,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Mike Rapoport <rppt@...nel.org>, Nadav Amit <namit@...are.com>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v33 6/6] selftests: mm: add pagemap ioctl tests

On 02/11/2023 11:49, Muhammad Usama Anjum wrote:
> On 11/2/23 4:45 PM, Ryan Roberts wrote:
>> On 21/08/2023 15:15, Muhammad Usama Anjum wrote:
>>
>> [...]
>>
>>> +
>>> +
>>> +int init_uffd(void)
>>> +{
>>> +	struct uffdio_api uffdio_api;
>>> +
>>> +	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);
>>> +	if (uffd == -1)
>>> +		ksft_exit_fail_msg("uffd syscall failed\n");
>>> +
>>> +	uffdio_api.api = UFFD_API;
>>> +	uffdio_api.features = UFFD_FEATURE_WP_UNPOPULATED | UFFD_FEATURE_WP_ASYNC |
>>> +			      UFFD_FEATURE_WP_HUGETLBFS_SHMEM;
>>> +	if (ioctl(uffd, UFFDIO_API, &uffdio_api))
>>> +		ksft_exit_fail_msg("UFFDIO_API\n");
>>> +
>>> +	if (!(uffdio_api.api & UFFDIO_REGISTER_MODE_WP) ||
>>> +	    !(uffdio_api.features & UFFD_FEATURE_WP_UNPOPULATED) ||
>>> +	    !(uffdio_api.features & UFFD_FEATURE_WP_ASYNC) ||
>>> +	    !(uffdio_api.features & UFFD_FEATURE_WP_HUGETLBFS_SHMEM))
>>> +		ksft_exit_fail_msg("UFFDIO_API error %llu\n", uffdio_api.api);
>>
>> Hi,
>>
>> I've just noticed that this fails on arm64 because the required features are not
>> available. It's common practice to skip instead of fail for this sort of
>> condition (and that's how all the other uffd tests work). The current fail
>> approach creates noise in our CI.
>>
>> I see this is already in mm-stable so perhaps we can add a patch to fix on top?
> Yeah, we can add a patch to skip all the tests instead of failing here. Let
> me send a patch this week.

Thats great - thanks for the fast response!

> 
>>
>> Thanks,
>> Ryan
>>
>>
>