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Re: [PATCH v6 09/15] xen/page_alloc: introduce preserved page flags macro
- To: Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 1 Feb 2024 16:13:53 +0100
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- Cc: andrea.bastoni@xxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 01 Feb 2024 15:14:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.02.2024 15:49, Carlo Nonato wrote:
> On Thu, Feb 1, 2024 at 3:24 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>> On 29.01.2024 18:18, Carlo Nonato wrote:
>>> PGC_static and PGC_extra are flags that needs to be preserved when assigning
>>> a page. Define a new macro that groups those flags and use it instead of
>>> or'ing every time.
>>
>> While here you say where the "preserving" applies, ...
>>
>>> --- a/xen/common/page_alloc.c
>>> +++ b/xen/common/page_alloc.c
>>> @@ -157,6 +157,8 @@
>>> #define PGC_static 0
>>> #endif
>>>
>>> +#define PGC_preserved (PGC_extra | PGC_static)
>>
>> ... nothing is said here. From the earlier version I also seem to recall
>> that the constant was then used outside of assign_pages(). That would
>> then mean amending whatever comment would be added here.
>
> Yes, but it was used in places where the name didn't fit (to stop merging in
> free_heap_pages()) and so I thought it would've been better to use the
> constant only for one of the two concepts: only for preserved flags in
> assign_pages().
>
> Are you suggesting adding a comment to this #define to clarify its usage?
Yes. Albeit if I understand the earlier paragraph right, you don't use
it further (anymore). In which case the question would be: Is the patch
still needed, and if so is it rightfully part of this series?
Jan
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