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The microcode update takes one snapshot and > > compares it with the saved copy at boot. > > > > However, the capabilities in the boot copy can be turned off as a result of > > certain command line parameters or configuration restrictions. This can > > cause a mismatch when comparing the values before and after the microcode > > update. > > Hmm, but if that has happened, the capabilities will be turned off in > your @orig argument below? > > Or are you saying that this copy_cpu_caps() read before the update will > overwrite the cleared bits with the their actual values from CPUID so > that what you really wanna compare here is *hardware* CPUID bits before > and after and not our potentially modified copy? > > I.e., some bit in CPUID is 1 and we have cleared it in our copy. > > Close? Correct. > > If so, then this should be specifically called out in the commit > message. Sounds good, I can certainly add it when I repost. > > > +static void copy_cpu_caps(struct cpuinfo_x86 *info) > > If anything, that function should be called > > store_cpu_caps() > The names sounds more fitting, I can change it as suggested. Cheers, Ashok