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Re: [PATCH v2 2/5] x86/IDT: Make idt_tables[] be per_cpu(idt)
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 5 Mar 2025 15:01:23 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 05 Mar 2025 14:01:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.03.2025 01:02, Andrew Cooper wrote:
> This can be a plain per_cpu() variable, and __read_mostly seeing as it's
> allocated once and never touched again.
cpu_smpboot_free() certainly touches (really: modifies) it again. Just that ...
> @@ -1009,7 +1009,7 @@ static void cpu_smpboot_free(unsigned int cpu, bool
> remove)
> if ( remove )
> {
> FREE_XENHEAP_PAGE(per_cpu(gdt, cpu));
> - FREE_XENHEAP_PAGE(idt_tables[cpu]);
> + FREE_XENHEAP_PAGE(per_cpu(idt, cpu));
... this function-like macro hides that the macro argument is written to. (This
is the kind of hiding that elsewhere I think you dislike, yet there macros were
an idea of yours, iirc.)
Jan
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