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x86: work around Fedora-11 x86-32 kernel failures on Intel Atom CPUs

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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>
This commit is contained in:
Ingo Molnar 2009-03-10 22:31:03 +01:00
parent 16b71fdf97
commit 211b3d03c7
1 changed files with 11 additions and 0 deletions
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11
arch/x86/mm/pageattr.c
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@ -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: