Re: [PATCH v5 03/78] xarray: Add the xa_lock to the radix_tree_root

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On Fri, Dec 15, 2017 at 02:03:35PM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
> 
> This results in no change in structure size on 64-bit x86 as it fits in
> the padding between the gfp_t and the void *.

The patch does more than described in the subject and commit message. At first
I was confused why do you need to touch idr here. It took few minutes to figure
it out.

Could you please add more into commit message about lockname and xa_ locking
interface since you introduce it here?

-- 
 Kirill A. Shutemov

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