linux-kernel - Re: [PATCH v3 01/10] iov_iter: Fix some checkpatch complaints in kunit tests

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Date:   Wed, 15 Nov 2023 20:00:00 -0800
From:   Joe Perches <joe@...ches.com>
To:     David Howells <dhowells@...hat.com>,
        Christian Brauner <christian@...uner.io>
Cc:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        David Laight <David.Laight@...LAB.COM>,
        Matthew Wilcox <willy@...radead.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        David Gow <davidgow@...gle.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        Christian Brauner <brauner@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v3 01/10] iov_iter: Fix some checkpatch complaints in
 kunit tests

On Wed, 2023-11-15 at 15:49 +0000, David Howells wrote:
> Fix some checkpatch complaints in the new iov_iter kunit tests:
> 
>  (1) Some lines had eight spaces instead of a tab at the start.
> 
>  (2) Checkpatch doesn't like (void*)(unsigned long)0xnnnnnULL, so switch to
>      using POISON_POINTER_DELTA plus an offset instead.

That's because checkpatch is fundamentally stupid and
that's a false positive.

> diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c
[]
> @@ -548,7 +548,7 @@ static void __init iov_kunit_extract_pages_kvec(struct kunit *test)
>  		size_t offset0 = LONG_MAX;
>  
>  		for (i = 0; i < ARRAY_SIZE(pagelist); i++)
> -			pagelist[i] = (void *)(unsigned long)0xaa55aa55aa55aa55ULL;
> +			pagelist[i] = (void *)POISON_POINTER_DELTA + 0x5a;

I think the original is easier to understand
or would best be replaced by a single #define
without the addition.

> @@ -626,7 +626,7 @@ static void __init iov_kunit_extract_pages_bvec(struct kunit *test)
>  		size_t offset0 = LONG_MAX;
>  
>  		for (i = 0; i < ARRAY_SIZE(pagelist); i++)
> -			pagelist[i] = (void *)(unsigned long)0xaa55aa55aa55aa55ULL;
> +			pagelist[i] = (void *)POISON_POINTER_DELTA + 0x5a;

etc...