Re: [PATCH] x86, setup: add __flush_tlb() for Intel Quark X1000

[Bryan O'Donoghue]

On 26/09/14 06:32, Dave Hansen wrote:
> I'd just say:
>
> Quark X1000 wrongly advertises PGE.  Work around this with an
> unconditional full flush using a CR3 write instead of CR4.PGE:

Hi Dave.

In another thread with Ingo Molnar and Henrique de Moraes Holschuh the 
following text was proposed.

+	/*
+	 * Locate the page directory and flush the TLB.
+	 *
+	 * On Quark X1000 CPUs we still have the PGE bit incorrectly set
+	 * due to a processor erratum, so __flush_tlb_all() is not yet
+	 * doing what it says.  Fortunately we have a cr3 flush here,
+	 * which is what is needed in this processor to flush TLBs, so
+	 * there's no need to add a Quark X1000 quirk here.
+	 *
+	 * early_init_intel will unset the X86_FEATURE_PGE flag later
+	 * and __flush_tlb_all() will flush via cr3
+	 */

Path submitted as "[PATCH] x86: Quark: Comment setup_arch for TLB/PGE 
bugfix"

Does that work for you ?

--
BOD
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/