Messages in this thread | | | Date | Mon, 27 Jul 2020 10:36:19 +0200 | From | peterz@infradea ... | Subject | Re: [PATCH 4/4] x86/cpu: Use SERIALIZE in sync_core() when available |
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On Sun, Jul 26, 2020 at 10:55:15PM -0700, hpa@zytor.com wrote: > For a really overenginered solution, but which might perform > unnecessary poorly on existing hardware: > > asm volatile("1: .byte 0xf, 0x1, 0xe8; 2:" > _ASM_EXTABLE(1b,2b));
Ha! cute, you take an #UD ?
We could optimize the #UD exception handler for this I suppose, but that makes it an even worse hack. The simple alternative() seems like a much simpler approach.
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