linux-kernel - Re: [PATCH] x86, pkeys: fix siginfo ABI breakage from new field

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Message-ID: <20160227091013.6e0606d1@canb.auug.org.au>
Date:	Sat, 27 Feb 2016 09:10:13 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org,
	dave.hansen@...ux.intel.com, akpm@...ux-foundation.org,
	tglx@...utronix.de, mingo@...e.hu, peterz@...radead.org,
	linux-next@...r.kernel.org, deller@....de
Subject: Re: [PATCH] x86, pkeys: fix siginfo ABI breakage from new field

Hi,

On Fri, 26 Feb 2016 09:44:00 -0800 "H. Peter Anvin" <hpa@...or.com> wrote:
>
> 
> __u64 is okay, "unsigned long" is really messy in the presence of 32-on-64 bit ABIs...

Yeah, but unfortunately, any 64 bit scalar type here will change the
alignment of the enclosing unions on (some) 32 bit platforms and thus
break the ABI.

-- 
Cheers,
Stephen Rothwell