Commit-ID: 211b3d03c7400f48a781977a50104c9d12f4e229 Gitweb: http://git.kernel.org/tip/211b3d03c7400f48a781977a50104c9d12f4e229 Author: "Ingo Molnar" <mingo@xxxxxxx> AuthorDate: Tue, 10 Mar 2009 22:31:03 +0100 Commit: Ingo Molnar <mingo@xxxxxxx> CommitDate: Wed, 11 Mar 2009 18:22:03 +0100 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 <torvalds@xxxxxxxxxxxxxxxxxxxx> Tested-by: Kyle McMartin <kyle@xxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- arch/x86/mm/pageattr.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 7be47d1..7233bd7 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -515,6 +515,17 @@ static int split_large_page(pte_t *kpte, unsigned long address) * primary protection behavior: */ __set_pmd_pte(kpte, address, mk_pte(base, __pgprot(_KERNPG_TABLE))); + + /* + * 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-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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