[PATCH v6 00/12]powerpc: "paca->soft_enabled" based local atomic operation implementation

Michael Ellerman mpe at ellerman.id.au
Wed Feb 8 23:44:31 AEDT 2017

Madhavan Srinivasan <maddy at linux.vnet.ibm.com> writes:

> Hi mpe,
> Any update on this series. Have also fixed the naming issue with patch 12
> and with this series applied,
> "paca->soft_enabled"  becomes "paca->soft_disabled_mask"

Yeah sorry I've been putting off dealing with it.

Ideally we'd do the naming change earlier in the series, but maybe
that's not worth it.

The one thing I wanted to make sure was that regs->softe is never
exposed to userspace. Because we're changing its semantics, and user
space has no business knowing about it.

So I just checked the code, and we do allow userspace to see the softe
value. So I think we should fix that before this goes in.

The safest option is to just hardwire it to 1, as that's the value it
should always have in a userspace pt_regs.


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