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There's an erratum that prevents the PAT from working correctly: https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/pentium-dual-core-specification-update.pdf # Document 316515 Version 010 The kernel currently disables PAT support on those CPUs, but it does it with some magic numbers. Replace the magic numbers with the new "IFM" macros. Make the check refer to the last affected CPU (INTEL_CORE_YONAH) rather than the first fixed one. This makes it easier to find the documentation of the erratum since Intel documents where it is broken and not where it is fixed. I don't think the Pentium Pro (or Pentium II) is actually affected. But the old check included them, so it can't hurt to keep doing the same. I'm also not completely sure about the "Pentium M" CPUs (models 0x9 and 0xd). But, again, they were included in in the old checks and were close Pentium III derivatives, so are likely affected. While we're at it, revise the comment referring to the erratum name and making sure it is a quote of the language from the actual errata doc. That should make it easier to find in the future when the URL inevitably changes. Why bother with this in the first place? It actually gets rid of one of the very few remaining direct references to c->x86{,_model}. No change in functionality intended. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Len Brown <len.brown@intel.com> Link: https://lore.kernel.org/r/20240829220042.1007820-1-dave.hansen@linux.intel.com |
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| sgx | ||
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| amd.c | ||
| aperfmperf.c | ||
| bugs.c | ||
| cacheinfo.c | ||
| centaur.c | ||
| common.c | ||
| cpu.h | ||
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| cyrix.c | ||
| debugfs.c | ||
| feat_ctl.c | ||
| hygon.c | ||
| hypervisor.c | ||
| intel_epb.c | ||
| intel.c | ||
| Makefile | ||
| match.c | ||
| mkcapflags.sh | ||
| mshyperv.c | ||
| perfctr-watchdog.c | ||
| powerflags.c | ||
| proc.c | ||
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| scattered.c | ||
| topology_amd.c | ||
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| topology.h | ||
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| umc.c | ||
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| vmware.c | ||
| vortex.c | ||
| zhaoxin.c | ||