Re: [tip:mm/pkeys] mm/pkeys: Fix siginfo ABI breakage caused by new u64 field
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- Subject: Re: [tip:mm/pkeys] mm/pkeys: Fix siginfo ABI breakage caused by new u64 field
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Sat, 5 Mar 2016 17:52:34 +0100
- Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Peter Anvin <hpa@xxxxxxxxx>, Dave Hansen <dave@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>
- In-reply-to: <20160305135006.GA15928@gmail.com>
- User-agent: Mutt/1.5.21 (2012-12-30)
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?
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