Messages in this thread | | | Subject | Re: [PATCH v5 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs | From | Stas Sergeev <> | Date | Wed, 17 Feb 2016 13:03:12 +0300 |
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17.02.2016 10:21, Ingo Molnar пишет: > > * Andy Lutomirski <luto@kernel.org> wrote: > >> + * If the kernel ever adds explicit fs, gs, fsbase, and gsbase >> + * save/restore, it will most likely need to be opt-in and use >> + * different context slots. > > Btw., that's not necessarily true: it could also be made opt-out, and a > modify_ldt() or any other cleanly identifiable legacy usage/signature that is > associated with DOSEMU might trigger the opt-out automatically as well. But there are the new versions of dosemu that still use "modify_ldt() or any other cleanly identifiable legacy usage/signature" and yet wants a new functionality. Please don't go for such an unreliable heuristic.
> I.e. behaviorally it would still keep the ABI and modern default behavior could > still be whatever we want to make it. You can allow glibc to deal with the opt-ins. It has symbol versioning system AFAIK exactly for that.
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