linux-kernel - Re: [PATCH v1 5/7] selftests/vm: anon

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Date:   Tue, 25 Oct 2022 09:10:18 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Nadav Amit <namit@...are.com>, Peter Xu <peterx@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Rapoport <rppt@...nel.org>,
        Christoph von Recklinghausen <crecklin@...hat.com>,
        Don Dutile <ddutile@...hat.com>
Subject: Re: [PATCH v1 5/7] selftests/vm: anon_cow: add liburing test cases

On 27.09.22 13:01, David Hildenbrand wrote:
> io_uring provides a simple mechanism to test long-term, R/W GUP pins
> -- via fixed buffers -- and can be used to verify that GUP pins stay
> in sync with the pages in the page table even if a page would
> temporarily get mapped R/O or concurrent fork() could accidentially
> end up sharing pinned pages with the child.
> 
> Note that this essentially re-introduces local_config support that was
> removed recently in commit 6f83d6c74ea5 ("Kselftests: remove support of
> libhugetlbfs from kselftests").
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---

The following fixup on top:

diff --git a/tools/testing/selftests/vm/anon_cow.c b/tools/testing/selftests/vm/anon_cow.c
index c1450a5d6f53..01417a604eda 100644
--- a/tools/testing/selftests/vm/anon_cow.c
+++ b/tools/testing/selftests/vm/anon_cow.c
@@ -346,7 +346,7 @@ static void do_test_iouring(char *mem, size_t size, bool use_fork)
         struct io_uring_cqe *cqe;
         struct io_uring_sqe *sqe;
         struct io_uring ring;
-       size_t cur, total;
+       ssize_t cur, total;
         struct iovec iov;
         char *buf, *tmp;
         int ret, fd;


-- 
Thanks,

David / dhildenb