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Re: [PATCH v2 04/13] xen/page_alloc: Coerce min(flsl(), foo) expressions to being unsigned
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 29 May 2024 20:19:00 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, "consulting @ bugseng . com" <consulting@xxxxxxxxxxx>, Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, Federico Serafini <federico.serafini@xxxxxxxxxxx>, Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 29 May 2024 19:19:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29/05/2024 8:07 pm, Andrew Cooper wrote:
> On 27/05/2024 7:26 am, Jan Beulich wrote:
>> On 24.05.2024 22:03, Andrew Cooper wrote:
>>> This is in order to maintain bisectability through the subsequent changes,
>>> where flsl() changes sign-ness non-atomically by architecture.
>>>
>>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
>>
>>
> Actually, by coercing the min() in pvh_populate_memory_range() from
> patch 9 in this patch, the bisection-complexity of this series drops
> massively, and in particular I can merge patch 3 into 10.
>
> As you've given R-by on both, I'm going to go ahead and do this in order
> to make some headway on the series, given the deadlines, and that the
> RISC-V series is still pending this one.
Actually not quite. It's even more simple. This patch stays the same,
and the coercion gets added as find_first_set_bit() turns into ffsl().
~Andrew
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