linux-kernel - Re: [PATCH 03/23] uuid: remove uuid_be defintions from the uapi header

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Date:   Fri, 19 May 2017 11:58:41 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com, Joe Perches <joe@...ches.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        linux-xfs@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 03/23] uuid: remove uuid_be defintions from the uapi header

Christoph Hellwig <hch@....de> wrote:

> It's not a userspace ABI, so by defintion it does not break an
> existing user program.

That's an invalid assumption.  It is a de facto userspace ABI as it has been
exposed in /usr/include/linux/uuid.h for some time.

> If someone was using it they should be using uuid_t from libuuid instead, as
> that gives them the routines to deal with it.

Yes, they should - but that doesn't mean they do.

David