linux-kernel - Re: [PATCH v8 20/26] powerpc: book3s64: convert to pin_user_pages() and put_user

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Message-ID: <61e0c3a5-992e-4571-e22d-d63286ce10ec@nvidia.com>
Date:   Mon, 9 Dec 2019 21:53:00 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Paul Mackerras" <paulus@...ba.org>, Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <bpf@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 20/26] powerpc: book3s64: convert to pin_user_pages()
 and put_user_page()

On 12/9/19 3:46 PM, John Hubbard wrote:
> On 12/9/19 2:53 PM, John Hubbard wrote:
> ...
>> @@ -212,10 +211,9 @@ static void mm_iommu_unpin(struct mm_iommu_table_group_mem_t *mem)
>>   		if (!page)
>>   			continue;
>>   
>> -		if (mem->hpas[i] & MM_IOMMU_TABLE_GROUP_PAGE_DIRTY)
>> -			SetPageDirty(page);
>> +		put_user_pages_dirty_lock(&page, 1,
>> +				mem->hpas[i] & MM_IOMMU_TABLE_GROUP_PAGE_DIRTY);
>>   
>> -		put_page(page);
> 
> 
> Correction: this is somehow missing the fixes that resulted from Jan Kara's review (he
> noted that we can't take a page lock in this context). I must have picked up the
> wrong version of it, when I rebased for -rc1.
> 

Andrew, given that the series is now in -mm, what's the preferred way for me to fix this?
Send a v9 version of the whole series? Or something else?

I'm still learning the ropes...

thanks,
-- 
John Hubbard
NVIDIA

> Will fix in the next version (including the commit description). Here's what the
> corrected hunk will look like:
> 
> @@ -215,7 +214,8 @@ static void mm_iommu_unpin(struct mm_iommu_table_group_mem_t *mem)
>                  if (mem->hpas[i] & MM_IOMMU_TABLE_GROUP_PAGE_DIRTY)
>                          SetPageDirty(page);
>   
> -               put_page(page);
> +               put_user_page(page);
> +
>                  mem->hpas[i] = 0;
>          }
>   }
> 
> 
> thanks,
>