linux-kernel - Re: [PATCH v3 38/41] powerpc: convert put_page() to put_user

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Message-ID: <248c9ab2-93cc-6d8b-606d-d85b83e791e5@nvidia.com>
Date:   Thu, 8 Aug 2019 18:26:42 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <amd-gfx@...ts.freedesktop.org>, <ceph-devel@...r.kernel.org>,
        <devel@...verdev.osuosl.org>, <devel@...ts.orangefs.org>,
        <dri-devel@...ts.freedesktop.org>,
        <intel-gfx@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-block@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-fbdev@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-nfs@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <linux-xfs@...r.kernel.org>, <netdev@...r.kernel.org>,
        <rds-devel@....oracle.com>, <sparclinux@...r.kernel.org>,
        <x86@...nel.org>, <xen-devel@...ts.xenproject.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Hellwig <hch@....de>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v3 38/41] powerpc: convert put_page() to put_user_page*()

On 8/7/19 10:42 PM, Michael Ellerman wrote:
> Hi John,
> 
> john.hubbard@...il.com writes:
>> diff --git a/arch/powerpc/mm/book3s64/iommu_api.c b/arch/powerpc/mm/book3s64/iommu_api.c
>> index b056cae3388b..e126193ba295 100644
>> --- a/arch/powerpc/mm/book3s64/iommu_api.c
>> +++ b/arch/powerpc/mm/book3s64/iommu_api.c
>> @@ -203,6 +202,7 @@ static void mm_iommu_unpin(struct mm_iommu_table_group_mem_t *mem)
>>  {
>>  	long i;
>>  	struct page *page = NULL;
>> +	bool dirty = false;
> 
> I don't think you need that initialisation do you?
> 

Nope, it can go. Fixed locally, thanks.

Did you get a chance to look at enough of the other bits to feel comfortable 
with the patch, overall?

thanks,
-- 
John Hubbard
NVIDIA