linux-kernel - Re: [RFC] iommu: Use put_pages

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Message-ID: <5e147b84-f048-b5ff-09d6-ceffe4c2364a@huawei.com>
Date:   Thu, 14 Oct 2021 12:52:31 +0100
From:   John Garry <john.garry@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Will Deacon <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [RFC] iommu: Use put_pages_list

On 14/10/2021 12:20, Matthew Wilcox wrote:
> I'm going to keep pinging this patch weekly.
> 
> On Thu, Oct 07, 2021 at 07:17:02PM +0100, Matthew Wilcox wrote:
>> ping?

Robin, Were you checking this? You mentioned "I got
side-tracked trying to make io-pgtable use that freelist properly" in 
another thread, which seems related.

Thanks,
John

>>
>> On Thu, Sep 30, 2021 at 05:20:42PM +0100, Matthew Wilcox (Oracle) wrote:
>>> page->freelist is for the use of slab.  We already have the ability
>>> to free a list of pages in the core mm, but it requires the use of a
>>> list_head and for the pages to be chained together through page->lru.
>>> Switch the iommu code over to using free_pages_list().
>>>
>>> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
>>> ---
>>>   drivers/iommu/amd/io_pgtable.c | 99 +++++++++++++++-------------------
>>>   drivers/iommu/dma-iommu.c      | 11 +---
>>>   drivers/iommu/intel/iommu.c    | 89 +++++++++++-------------------
>>>   include/linux/iommu.h          |  3 +-
>>>   4 files changed, 77 insertions(+), 125 deletions(-)
>>>