Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct pt_regs"

[Denys Vlasenko]

On Fri, Aug 1, 2014 at 7:04 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> On Fri, Aug 1, 2014 at 7:48 AM, Denys Vlasenko <dvlasenk@xxxxxxxxxx> wrote:
>> 64-bit code was using six stack slots fewer by not saving/restoring
>> registers which a callee-preserved according to C ABI,
>> and not allocating space for them
>
> This is great.
>
> Next up: remove FIXUP/RESTORE_TOP_OF_STACK? :)  Maybe I'll give that a shot.

I'm yet at the stage "what that stuff does anyway?" and at
"why do we need percpu old_rsp thingy?" in particular.
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