On Tue, Jun 14, 2016 at 11:54:24AM -0700, Dave Hansen wrote:
> Lukasz, Borislav suggested using static_cpu_has_bug(), which will do the
> alternatives patching. It's definitely the right thing to use here.
Yeah, either that or do an
alternative_call(null_func, fix_pte_peak, X86_BUG_PTE_LEAK, ...)
or so and you'll need a dummy function to call on !X86_BUG_PTE_LEAK
CPUs.
The static_cpu_has_bug() thing should be most likely a penalty
of a single JMP (I have to look at the asm) but then since the
callers are inlined, you'll have to patch all those places where
*ptep_get_and_clear() get inlined.
Shouldn't be a big deal still but...
"debug-alternative" and a kvm guest should help you there to get a quick
idea.
HTH.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>