linux-kernel - Re: [PATCH] f2fs: Use memcpy_page() in f2fs_copy

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Message-ID: <YtOyWOKFN9ramUyb@infradead.org>
Date:   Sat, 16 Jul 2022 23:55:20 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        Nick Terrell <terrelln@...com>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH] f2fs: Use memcpy_page() in f2fs_copy_page()

On Sat, Jul 16, 2022 at 10:43:53PM +0200, Fabio M. De Francesco wrote:
>  static inline void f2fs_copy_page(struct page *src, struct page *dst)
>  {
> -	char *src_kaddr = kmap(src);
> -	char *dst_kaddr = kmap(dst);
>  
> -	memcpy(dst_kaddr, src_kaddr, PAGE_SIZE);
> -	kunmap(dst);
> -	kunmap(src);
> +	memcpy_page(dst, 0, src, 0, PAGE_SIZE);

Please remove f2fs_copy_page entirely and open code this in the only
caller.