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From: Andrew Morton <akpm@linux-foundation.org>
To: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Cc: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, david@fromorbit.com,
	hch@infradead.org, willy@infradead.org
Subject: Re: [PATCH 10/10] mm/migrate.c: call detach_page_private to cleanup code
Date: Mon, 18 May 2020 22:12:35 -0700	[thread overview]
Message-ID: <20200518221235.1fa32c38e5766113f78e3f0d@linux-foundation.org> (raw)
In-Reply-To: <20200517214718.468-11-guoqing.jiang@cloud.ionos.com>

On Sun, 17 May 2020 23:47:18 +0200 Guoqing Jiang <guoqing.jiang@cloud.ionos.com> wrote:

> We can cleanup code a little by call detach_page_private here.
> 
> ...
>
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -804,10 +804,7 @@ static int __buffer_migrate_page(struct address_space *mapping,
>  	if (rc != MIGRATEPAGE_SUCCESS)
>  		goto unlock_buffers;
>  
> -	ClearPagePrivate(page);
> -	set_page_private(newpage, page_private(page));
> -	set_page_private(page, 0);
> -	put_page(page);
> +	set_page_private(newpage, detach_page_private(page));
>  	get_page(newpage);
>  
>  	bh = head;

mm/migrate.c: In function '__buffer_migrate_page':
./include/linux/mm_types.h:243:52: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
 #define set_page_private(page, v) ((page)->private = (v))
                                                    ^
mm/migrate.c:800:2: note: in expansion of macro 'set_page_private'
  set_page_private(newpage, detach_page_private(page));
  ^~~~~~~~~~~~~~~~

The fact that set_page_private(detach_page_private()) generates a type
mismatch warning seems deeply wrong, surely.

Please let's get the types sorted out - either unsigned long or void *,
not half-one and half-the other.  Whatever needs the least typecasting
at callsites, I suggest.

And can we please implement set_page_private() and page_private() with
inlined C code?  There is no need for these to be macros.


  reply	other threads:[~2020-05-19  5:12 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-17 21:47 [PATCH 00/10] Introduce attach/detach_page_private " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 01/10] include/linux/pagemap.h: introduce attach/detach_page_private Guoqing Jiang
2020-05-17 21:47 ` [PATCH 02/10] md: remove __clear_page_buffers and use attach/detach_page_private Guoqing Jiang
2020-05-17 21:47 ` [PATCH 03/10] btrfs: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 04/10] fs/buffer.c: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 05/10] f2fs: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 06/10] iomap: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 07/10] ntfs: replace attach_page_buffers with attach_page_private Guoqing Jiang
2020-05-17 21:47 ` [PATCH 08/10] orangefs: use attach/detach_page_private Guoqing Jiang
2020-05-26 21:54   ` Mike Marshall
2020-05-28  8:39     ` Guoqing Jiang
2020-05-17 21:47 ` [PATCH 09/10] buffer_head.h: remove attach_page_buffers Guoqing Jiang
2020-05-17 21:47 ` [PATCH 10/10] mm/migrate.c: call detach_page_private to cleanup code Guoqing Jiang
2020-05-19  5:12   ` Andrew Morton [this message]
2020-05-19  7:35     ` Guoqing Jiang
2020-05-19 10:06       ` Gao Xiang
2020-05-19 11:02         ` Guoqing Jiang
2020-05-19 11:31           ` Gao Xiang
2020-05-19 15:16         ` Matthew Wilcox
2020-05-19 15:27           ` Gao Xiang
2020-05-19 20:44       ` Guoqing Jiang
2020-05-21 22:52   ` Dave Chinner
2020-05-22  7:18     ` Guoqing Jiang
2020-05-22 23:53       ` Andrew Morton
2020-05-24 19:02         ` Guoqing Jiang

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