linux-kernel - Re: [PATCH v3 1/1] mm: introduce put_user

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Date:   Fri, 8 Mar 2019 13:27:06 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Jerome Glisse <jglisse@...hat.com>, <john.hubbard@...il.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Benvenuti <benve@...co.com>,
        Christoph Hellwig <hch@...radead.org>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Tom Talpey <tom@...pey.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] mm: introduce put_user_page*(), placeholder
 versions

On 3/8/19 9:57 AM, Jerome Glisse wrote:
[snip] 
> Just a small comments below that would help my life :)
> 
> Reviewed-by: Jérôme Glisse <jglisse@...hat.com>
> 

Thanks for the review! 

>> ---
>>  include/linux/mm.h | 24 ++++++++++++++
>>  mm/swap.c          | 82 ++++++++++++++++++++++++++++++++++++++++++++++
> 
> Why not putting those functions in gup.c instead of swap.c ?

Yes, gup.c is better for these. And it passes the various cross compiler and
tinyconfig builds locally, so I think I'm not missing any cases. (The swap.c 
location was an artifact of very early approaches, pre-dating the
put_user_pages() name.) 

[snip]

>>  #define SECTION_IN_PAGE_FLAGS
>>  #endif
>> diff --git a/mm/swap.c b/mm/swap.c
>> index 4d7d37eb3c40..a6b4f693f46d 100644
>> --- a/mm/swap.c
>> +++ b/mm/swap.c
>> @@ -133,6 +133,88 @@ void put_pages_list(struct list_head *pages)
>>  }
>>  EXPORT_SYMBOL(put_pages_list);
>>  
>> +typedef int (*set_dirty_func)(struct page *page);
> 
> set_dirty_func_t would be better as it is the rule for typedef to append
> the _t also it make it easier for coccinelle patch.
> 

Done. I'm posting a v4 in a moment, with both of the above, plus
Christopher's "real filesystems" wording change, and your reviewed-by
tag.


thanks,
-- 
John Hubbard
NVIDIA