[RFC PATCH v2 4/6] arm64: signal: Allocate extra sigcontext space as needed

[Catalin Marinas]

On Tue, Jun 06, 2017 at 02:58:18PM +0100, Dave P Martin wrote:
> On Tue, Jun 06, 2017 at 12:37:53PM +0100, Dave Martin wrote:
> > On Mon, Jun 05, 2017 at 03:17:44PM +0100, Catalin Marinas wrote:
> 
> [...]
> 
> [extra_context.size]
> 
> > > I'd rather have the time size_t or __u64 to avoid implicit padding.
> > 
> > Sure, it can be a u64.  I wanted to avoid the suggestion that the frame
> > should be that large, but 32 bits already allows it to be crazy large
> > anyway, so I don't think making it 32-bit helps.
> 
> Actually, there is still implicit padding even with u64, since the total
> size is 16 bytes + sizeof(extra_context.size).
> 
> Since u64 is much bigger then we'd ever want, and to avoid introducing
> new bugs, do you object to keeping size as u32 and adding explicit
> padding instead?

I missed the extra padding to 16-byte alignment. In this case, I'm fine
with u32.

-- 
Catalin