| Date | Thu, 4 Nov 2021 19:00:43 +0100 | From | Borislav Petkov <> | Subject | Re: [RFC][PATCH 02/22] x86,mmx_32: Remove .fixup usage |
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On Thu, Nov 04, 2021 at 05:47:31PM +0100, Peter Zijlstra wrote: > This code puts an exception table entry on the "PREFIX" instruction to > overwrite it with a jmp.d8 when it triggers an exception. Except of > course, our code is no longer writable, also SMP. > > Replace it with ALTERNATIVE, the novel > > XXX: arguably we should just delete this code
Yah, might as well.
Wikipedia says the last AMD CPU which supports 3DNow is A8-3870K which is family 0x11, i.e.,
1. a real rarity 2. it is pretty much obsolete 3. even if not, it can do AMD64 4. and even if people who have it, wanna run 32-bit, they can use the normal memcpy, i.e., CONFIG_X86_USE_3DNOW=n should work there
In our case, it is a bit different, though:
config X86_USE_3DNOW def_bool y depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
MK7 is K7 - that is practically dead.
The only thing I have no clue about are those cyrix and geode things and whether they're still actively used in some embedded gunk.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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