From: Konrad Rzeszutek Wilk Date: Wed, 19 Jan 2011 01:17:10 +0000 (-0500) Subject: xen/mmu: WARN_ON when racing to swap middle leaf. X-Git-Tag: v2.6.39-rc1~521^2~5 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c7617798771ad588d585986d896197c04b737621;p=pandora-kernel.git xen/mmu: WARN_ON when racing to swap middle leaf. The initial bootup code uses set_phys_to_machine quite a lot, and after bootup it would be used by the balloon driver. The balloon driver does have mutex lock so this should not be necessary - but just in case, add a WARN_ON if we do hit this scenario. If we do fail this, it is OK to continue as there is a backup mechanism (VM_IO) that can bypass the P2M and still set the _PAGE_IOMAP flags. [v2: Change from WARN to BUG_ON] [v3: Rebased on top of xen->p2m code split] [v4: Change from BUG_ON to WARN] Reviewed-by: Ian Campbell Signed-off-by: Konrad Rzeszutek Wilk --- Reading git-diff-tree failed