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Commit 211b3d03 authored by Ingo Molnar's avatar Ingo Molnar
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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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Tested-by: default avatarKyle McMartin <kyle@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 16b71fdf

arch/x86/mm/pageattr.c

+11 −0
Original line number Diff line number Diff line
@@ -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: