linux-kernel - Re: [PATCH 12/17] fs/cramfs: Use memcpy_from

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Message-ID: <nycvar.YSQ.7.78.906.2011241020270.2184@knanqh.ubzr>
Date:   Tue, 24 Nov 2020 10:20:47 -0500 (EST)
From:   Nicolas Pitre <nico@...xnic.net>
To:     Ira Weiny <ira.weiny@...el.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Eric Biggers <ebiggers@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Howells <dhowells@...hat.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Steve French <sfrench@...ba.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Brian King <brking@...ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 12/17] fs/cramfs: Use memcpy_from_page()

On Mon, 23 Nov 2020, ira.weiny@...el.com wrote:

> From: Ira Weiny <ira.weiny@...el.com>
> 
> Remove open coded kmap/memcpy/kunmap and use mempcy_from_page() instead.
> 
> Cc: Nicolas Pitre <nico@...xnic.net>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

Acked-by: Nicolas Pitre <nico@...xnic.net>


> ---
>  fs/cramfs/inode.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
> index 4b90cfd1ec36..996a3a32a01f 100644
> --- a/fs/cramfs/inode.c
> +++ b/fs/cramfs/inode.c
> @@ -247,8 +247,7 @@ static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset,
>  		struct page *page = pages[i];
>  
>  		if (page) {
> -			memcpy(data, kmap(page), PAGE_SIZE);
> -			kunmap(page);
> +			memcpy_from_page(data, page, 0, PAGE_SIZE);
>  			put_page(page);
>  		} else
>  			memset(data, 0, PAGE_SIZE);
> -- 
> 2.28.0.rc0.12.gb6a658bd00c9
> 
>