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Groups > linux.kernel > #1200547
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 5/8] x86/vm86: Add a separate config option for hardware IRQ handling |
| Date | 2015-08-05 11:00 +0200 |
| Message-ID | <pU2Ik-4Ky-27@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <pRspB-7rV-17@gated-at.bofh.it> <pSekx-zO-1@gated-at.bofh.it> <pShs5-5ev-5@gated-at.bofh.it> <pSj0T-7rR-39@gated-at.bofh.it> <pSj0T-7rR-51@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
* Brian Gerst <brgerst@gmail.com> wrote: > >> Disabling even less-used code that could have system stability impact. We've > >> discouraged user-mode drivers for a very long time. Ironically, other than > >> being configured through the vm86 syscall, there isn't really anything > >> vm86-specific about it. All it does is register an IRQ handler that sends a > >> signal to the task. > > > > So is this actually used by anything? Could we get away with disabling it, > > just to see whether anything cares? > > My best guess would be some very old X11 drivers that needed interrupts to run > the Video BIOS code. So let's keep it - but not complicate it with another layer of disabling logic. People that rely on legacies will enable vm86 as a single block - they won't necessarily know how deeply they rely on it. What _would_ be useful is to have a 3-mode vm86 sysctl: 1: enabled 0: disabled -1: disabled permanently (one-shot disabling after bootup) That way a distro can permanently disable vm86 for a particular bootup by setting it to -1 in /etc/sysctl.conf. The kernel should default that setting to '0'. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH 5/8] x86/vm86: Add a separate config option for hardware IRQ handling Ingo Molnar <mingo@kernel.org> - 2015-08-05 11:00 +0200
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