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| author | Ingo Molnar <mingo@elte.hu> | 2009-03-10 22:31:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-11 18:22:03 +0100 |
| commit | 211b3d03c7400f48a781977a50104c9d12f4e229 (patch) | |
| tree | 2a08c506fab4518ee20d245af2885cb4c4e35fa2 /arch | |
| parent | 16b71fdf97599f1b1b7f38418ee9922d9f117396 (diff) | |
| download | op-kernel-dev-211b3d03c7400f48a781977a50104c9d12f4e229.zip op-kernel-dev-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>
Diffstat (limited to 'arch')
| -rw-r--r-- | 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 7be47d1a9..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: |
