-stable review patch. If anyone has any objections, please let us know. ------------------ From: Ingo Molnar commit 211b3d03c7400f48a781977a50104c9d12f4e229 upstream [Trivial backport to 2.6.27 by cebbert@redhat.com] x86: work around Fedora-11 x86-32 kernel failures on Intel Atom CPUs Impact: work around boot crash Work around Intel Atom erratum AAH41 (probabilistically) - it's triggering in the field. Reported-by: Linus Torvalds Tested-by: Kyle McMartin Signed-off-by: Ingo Molnar Cc: Signed-off-by: Greg Kroah-Hartman --- --- arch/x86/mm/pageattr.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -565,6 +565,17 @@ static int split_large_page(pte_t *kpte, ref_prot = pte_pgprot(pte_mkexec(pte_clrhuge(*kpte))); pgprot_val(ref_prot) |= _PAGE_PRESENT; __set_pmd_pte(kpte, address, mk_pte(base, ref_prot)); + + /* + * Intel Atom errata AAH41 workaround. + * + * The real fix should be in hw or in a microcode update, but + * we also probabilistically try to reduce the window of having + * a large TLB mixed with 4K TLBs while instruction fetches are + * going on. + */ + __flush_tlb_all(); + base = NULL; out_unlock: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/