linux-kernel - Re: [PATCH v6 0/9] Allow dynamic allocation of software IO TLB bounce buffers

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Message-ID: <4c2f96bc-f6c0-4a04-e4fa-6ab1b5e56bd6@huaweicloud.com>
Date:   Tue, 1 Aug 2023 08:28:42 +0200
From:   Petr Tesarik <petrtesarik@...weicloud.com>
To:     Petr Tesařík <petr@...arici.cz>,
        Christoph Hellwig <hch@....de>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Petr Tesarik <petr.tesarik.ext@...wei.com>,
        Jonathan Corbet <corbet@....net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        James Seo <james@...iv.tech>,
        James Clark <james.clark@....com>,
        Kees Cook <keescook@...omium.org>,
        "moderated list:XEN HYPERVISOR ARM" <xen-devel@...ts.xenproject.org>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        "open list:XEN SWIOTLB SUBSYSTEM" <iommu@...ts.linux.dev>,
        "open list:SLAB ALLOCATOR" <linux-mm@...ck.org>,
        Roberto Sassu <roberto.sassu@...weicloud.com>
Subject: Re: [PATCH v6 0/9] Allow dynamic allocation of software IO TLB bounce
 buffers

On 7/31/2023 9:46 PM, Petr Tesařík wrote:
> V Mon, 31 Jul 2023 18:04:09 +0200
> Christoph Hellwig <hch@....de> napsáno:
> 
>> I was just going to apply this, but patch 1 seems to have a non-trivial
>> conflict with the is_swiotlb_active removal in pci-dma.c.  Can you resend
>> against the current dma-mapping for-next tree?
> 
> Sure thing, will re-send tomorrow morning.

After commit f9a38ea5172a ("x86: always initialize xen-swiotlb when
xen-pcifront is enabling") removed that call to swiotlb_init_late(),
there is nothing to patch, and the hunk can be dropped.

I have just sent v7.

Petr T