linux-kernel - Re: [tip:mm/pkeys] mm/pkeys: Fix siginfo ABI breakage caused by new u64 field

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Date:	Sat, 5 Mar 2016 17:52:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Peter Anvin <hpa@...or.com>, Dave Hansen <dave@...1.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Helge Deller <deller@....de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:mm/pkeys] mm/pkeys: Fix siginfo ABI breakage caused by new
 u64 field

On Sat, Mar 05, 2016 at 02:50:06PM +0100, Ingo Molnar wrote:
> A more workable method would be to have a test .c file that includes all UAPI 
> structures in existence and defines a variable out of every single one, and then 
> generates a list of sizeof() values or so. But even that isn't perfect: a 
> structure might shift some fields forward, into a pre-existing hole, without 
> changing the sizeof? We'd need a list of all field offsets in all structures to be 
> really sure, and that's nasty.

pahole has such logic, right?