[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [PATCH] fix pgd_lock deadlock
On Thu, Feb 17, 2011 at 11:19:41AM +0100, Johannes Weiner wrote: > So Xen needs all page tables protected when pinning/unpinning and > extended page_table_lock to cover kernel range, which it does nowhere > else AFAICS. But the places it extended are also taking the pgd_lock, > so I wonder if Xen could just take the pgd_lock itself in these paths > and we could revert page_table_lock back to cover user va only? > Jeremy, could this work? Untested. If this works for Xen, I definitely prefer this. Still there's no point to insist on _irqsave if nothing takes the pgd_lock from irq, so my patch probably should be applied anyway or it's confusing and there's even a comment saying pgd_dtor is called from irq, if it's not it should be corrected. But then it becomes a cleanup notafix. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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