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Re: [Xen-devel] [PATCH 1/4] arm/percpu: Move {get, set}_processor_id() into smp.h
- To: Julien Grall <julien.grall@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 26 Jul 2019 23:37:21 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Fri, 26 Jul 2019 22:37:30 +0000
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On 26/07/2019 23:30, Julien Grall wrote:
> Hi Andrew,
>
> Thank you for looking into this.
>
> On 7/26/19 10:08 PM, Andrew Cooper wrote:
>> For cleanup purposes, it is necessary for asm/percpu.h to not use
>> DECLARE_PER_CPU() itself. asm/smp.h is arguably a better place for it to
>> live anyway.
> I have noticed that a lot of arch helpers called by common code
> are defined in different headers. The most offenders are in mm.h
> and page.h.
Those are massive rats nests. At least we're slowly making progress on
the outskirts.
Lonterm, I'd like to get to a position where the only time you'd ever
include an asm/ header is either from the common header itself, or for
headers unique to the current architecture. I expect this to simplify
things massively.
>
> Looking at x86, the two helpers are defined in current.h. So I
> think it would make sense to define them at the same places. I
> don't have a particular preference between smp.h and current.h,
> just want some consistency :).
>
> FWIW, Xen build nicely when the helpers are moved in current.h:
I did consider current.h, but couldn't decide and flipped a coin.
I'm perfectly happy to put it here if that's what you'd prefer.
~Andrew
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