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Date: Thu, 15 Mar 2018 06:47:20 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Coly Li <colyli@suse.de>
Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org
Subject: Re: [RFC PATCH] bcache: enable big endian support for IBM s390x
Message-ID: <20180315134720.GA14209@infradead.org>
References: <20180315111500.24865-1-colyli@suse.de>
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> +static void swap_cache_sb_from_cpu(struct cache_sb *sb,
> +				   struct cache_sb *out)
> +{
> +	int i;
> +
> +	out->offset		= cpu_to_le64(sb->offset);
> +	out->flags		= cpu_to_le64(sb->flags);
> +	out->seq		= cpu_to_le64(sb->seq);

This looks completely bogus and sparse will complain loudly about it.
Please make sure you have proper endianess annotations in place.