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Message-ID: <2d5db599144596bdc12533a366d5d2d8f375014e.camel@perches.com>
Subject: Re: [PATCH v3 01/10] iov_iter: Fix some checkpatch complaints in
 kunit tests
From:   Joe Perches <joe@perches.com>
To:     David Howells <dhowells@redhat.com>,
        Christian Brauner <christian@brauner.io>
Cc:     Jens Axboe <axboe@kernel.dk>, Al Viro <viro@zeniv.linux.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>,
        David Laight <David.Laight@ACULAB.COM>,
        Matthew Wilcox <willy@infradead.org>,
        Brendan Higgins <brendanhiggins@google.com>,
        David Gow <davidgow@google.com>, linux-fsdevel@vger.kernel.org,
        linux-block@vger.kernel.org, linux-mm@kvack.org,
        netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
        kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org,
        Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
        Christian Brauner <brauner@kernel.org>,
        David Hildenbrand <david@redhat.com>,
        John Hubbard <jhubbard@nvidia.com>
Date:   Wed, 15 Nov 2023 20:00:00 -0800
In-Reply-To: <20231115154946.3933808-2-dhowells@redhat.com>
References: <20231115154946.3933808-1-dhowells@redhat.com>
         <20231115154946.3933808-2-dhowells@redhat.com>
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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...