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authorIngo Molnar <mingo@elte.hu>2009-03-10 22:31:03 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-11 18:22:03 +0100
commit211b3d03c7400f48a781977a50104c9d12f4e229 (patch)
tree2a08c506fab4518ee20d245af2885cb4c4e35fa2
parent16b71fdf97599f1b1b7f38418ee9922d9f117396 (diff)
downloadlinux-2.6.34-ux500-211b3d03c7400f48a781977a50104c9d12f4e229.tar.gz
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@linux-foundation.org> Tested-by: Kyle McMartin <kyle@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/mm/pageattr.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 7be47d1a97e..7233bd7e357 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: