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Groups > linux.kernel > #1336195
| From | Stas Sergeev <stsp@list.ru> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v5 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs |
| Date | 2016-02-17 11:10 +0100 |
| Message-ID | <r37dw-4Sm-17@gated-at.bofh.it> (permalink) |
| References | <r2WUN-6a6-3@gated-at.bofh.it> <r2X4t-6dy-1@gated-at.bofh.it> <r34IG-35g-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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[PATCH v5 0/4] x86: sigcontext fixes, again Andy Lutomirski <luto@kernel.org> - 2016-02-17 00:10 +0100
[PATCH v5 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context Andy Lutomirski <luto@kernel.org> - 2016-02-17 00:10 +0100
[tip:x86/asm] x86/signal/64: Re-add support for SS in the 64-bit signal context tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-02-17 13:20 +0100
[PATCH v5 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Andy Lutomirski <luto@kernel.org> - 2016-02-17 00:20 +0100
Re: [PATCH v5 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Ingo Molnar <mingo@kernel.org> - 2016-02-17 08:30 +0100
Re: [PATCH v5 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Stas Sergeev <stsp@list.ru> - 2016-02-17 11:10 +0100
Re: [PATCH v5 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Ingo Molnar <mingo@kernel.org> - 2016-02-17 12:10 +0100
[tip:x86/asm] x86/signal/64: Add a comment about sigcontext-> fs and gs tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-02-17 13:20 +0100
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