Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context

[Cyrill Gorcunov]

On Mon, Oct 12, 2015 at 06:04:07PM -0700, Andy Lutomirski wrote:
...
> 
> For the benefit of new 64-bit software that uses segmentation (new
> versions of DOSEMU might), the new behavior can be detected with a
> new ucontext flag UC_SIGCONTEXT_SS.
> 
> To avoid compilation issues, __pad0 is left as an alias for ss in
> ucontext.
> 
> The nitty-gritty details are documented in the header file.
> 
> Cc: Stas Sergeev <stsp@xxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
> Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>

Andy, so for old criu versions (prior the 1.5.1 which is Mar 2015,
in next versions we already write proper ss into the images)
we've been providing __pad = 0, which is ss in a new meaning,
and the kernel will overwrite it with @user-ds after this series,
correct? This should work for us. Stas, mind to refresh my memory,
which ss value doesmu setups here?
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