linux-kernel - Re: [PATCH 2/2] x86/ACPI: Set swiotlb area according to the number of lapic entry in MADT

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Message-ID: <YrxcCZKvFYjxLf9n@infradead.org>
Date:   Wed, 29 Jun 2022 07:04:57 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     corbet@....net, rafael@...nel.org, len.brown@...el.com,
        pavel@....cz, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        hch@...radead.org, m.szyprowski@...sung.com, robin.murphy@....com,
        paulmck@...nel.org, akpm@...ux-foundation.org,
        keescook@...omium.org, songmuchun@...edance.com,
        rdunlap@...radead.org, damien.lemoal@...nsource.wdc.com,
        michael.h.kelley@...rosoft.com, kys@...rosoft.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        vkuznets@...hat.com, wei.liu@...nel.org, parri.andrea@...il.com,
        thomas.lendacky@....com, linux-hyperv@...r.kernel.org,
        kirill.shutemov@...el.com, andi.kleen@...el.com,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] x86/ACPI: Set swiotlb area according to the number
 of lapic entry in MADT

On Mon, Jun 27, 2022 at 11:31:50AM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> 
> When initialize swiotlb bounce buffer, smp_init() has not been
> called and cpu number can not be got from num_online_cpus().
> Use the number of lapic entry to set swiotlb area number and
> keep swiotlb area number equal to cpu number on the x86 platform.

Can we reorder that initialization?  Because I really hate having
to have an arch hook in every architecture.