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Re: [PATCH 4/4] x86/traps: Introduce early_traps_init() and simplify setup
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 21 Mar 2025 07:52:29 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 21 Mar 2025 06:52:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.03.2025 18:56, Andrew Cooper wrote:
> On 18/03/2025 3:26 pm, Jan Beulich wrote:
>> The sole dependency is percpu_init_areas(),
>> which runs - as even visible from patch context here - ahead of
>> early_traps_init().
>
> percpu_init_areas() isn't even a dependency. Notice how it only starts
> from CPU1. CPU0 (which is what this_cpu() refers to in both of these
> functions) is correct (i.e. 0) at build time.
Oh, right.
> I still intend to remove percpu_init_areas(). It's all build-time
> constant; it just needs doing by the assembler, rather than the
> compiler, as (-(long)__per_cpu_start) is not an integer constant expression.
Except that this value also cannot be expressed by a relocation, afaict,
so the assembler would choke when trying to write the object file. (Same
for x86'es alternative initializer.)
Jan
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