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Re: [Xen-devel] [PATCH 1/4] x86/mm: Refactor put_page_from_l*e to reduce code duplication
- To: George Dunlap <george.dunlap@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 12 Dec 2019 19:27:41 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Thu, 12 Dec 2019 19:28:01 +0000
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On 12/12/2019 17:32, George Dunlap wrote:
> put_page_from_l[234]e have identical functionality for devalidating an
> N-1 entry which is a pagetable. But mystifyingly, they duplicate the
> code in slightly different arrangements that make it hard to tell that
> it's the same.
ITYM "this code has grown rather more organically than most" :)
> Create a new function, put_pt_page(), which handles the common
> functionality; and refactor all the functions to be symmetric,
> differing only in the level of pagetable expected (and in whether they
> handle superpages).
>
> No functional change intended.
>
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
The only thing I can see is that the l2 case gains an assertion, but
this looks to be correct.
~Andrew
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