linux-kernel - Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

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Message-ID: <CALCETrWMgTET6MZwaH4D4tOg2v1kV6ozBnjGTGrecnMWJbkUEg@mail.gmail.com>
Date:	Fri, 11 Jul 2014 11:39:41 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Al Viro <viro@...iv.linux.org.uk>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

On Fri, Jul 11, 2014 at 11:12 AM, Andi Kleen <andi@...stfloor.org> wrote:
>> diff --git a/arch/x86/include/uapi/asm/sigcontext.h b/arch/x86/include/uapi/asm/sigcontext.h
>> index 076b11f..df9908b 100644
>> --- a/arch/x86/include/uapi/asm/sigcontext.h
>> +++ b/arch/x86/include/uapi/asm/sigcontext.h
>
> I don't think renaming fields in uapi/asm is acceptable. These
> are likely used by user programs and you'll break compiles.

Hmm.  That's a fair point.  On the other hand, any user code that uses
these fields explicitly may already be broken, since the current names
of these fields rather strongly imply that they do something.

Is there any clear policy on minor API breaks in the UAPI headers that
don't affect ABI?

--Andy
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