From: Fabio M. De Francesco <fmdefrancesco@gmail.com>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [PATCH] gfs2: Replace deprecated kmap_atomic() by kmap_local_page()
Date: Tue, 27 Jun 2023 13:11:46 +0200 [thread overview]
Message-ID: <1905283.taCxCBeP46@suse> (raw)
In-Reply-To: <ZJiUKeVy7G6ZkX80@bu2204.myguest.virtualbox.org>
On domenica 25 giugno 2023 21:23:21 CEST Deepak R Varma wrote:
> kmap_atomic() is deprecated in favor of kmap_local_{folio,page}().
>
> Therefore, replace kmap_atomic() with kmap_local_folio() in
> gfs2_internal_read() and stuffed_readpage().
>
> kmap_atomic() disables page-faults and preemption (the latter only for
> !PREEMPT_RT kernels), However, the code within the mapping/un-mapping in
> gfs2_internal_read() and stuffed_readpage() does not depend on the
> above-mentioned side effects.
>
> Therefore, a mere replacement of the old API with the new one is all that
> is required (i.e., there is no need to explicitly add any calls to
> pagefault_disable() and/or preempt_disable()).
>
> Signed-off-by: Deepak R Varma <drv@mailo.com>
> ---
> Note: The Patch is build tested only. I will be happy to run recommended
> testing with some guidance if required.
>
> fs/gfs2/aops.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
> index 3b41542d6697..7bd92054d353 100644
> --- a/fs/gfs2/aops.c
> +++ b/fs/gfs2/aops.c
> @@ -432,10 +432,10 @@ static int stuffed_readpage(struct gfs2_inode *ip,
> struct page *page) if (error)
> return error;
>
> - kaddr = kmap_atomic(page);
> + kaddr = kmap_local_page(page);
> memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
> memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
> - kunmap_atomic(kaddr);
> + kunmap_local(kaddr);
> flush_dcache_page(page);
> brelse(dibh);
> SetPageUptodate(page);
> @@ -498,12 +498,12 @@ int gfs2_internal_read(struct gfs2_inode *ip, char
*buf,
> loff_t *pos, continue;
> return PTR_ERR(page);
> }
> - p = kmap_atomic(page);
> + p = kmap_local_page(page);
> amt = size - copied;
> if (offset + size > PAGE_SIZE)
> amt = PAGE_SIZE - offset;
> memcpy(buf + copied, p + offset, amt);
How about using memcpy_from_page()?
Fabio
> - kunmap_atomic(p);
> + kunmap_local(p);
> put_page(page);
> copied += amt;
> index++;
> --
> 2.34.1
next parent reply other threads:[~2023-06-27 11:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <ZJiUKeVy7G6ZkX80@bu2204.myguest.virtualbox.org>
2023-06-27 11:11 ` Fabio M. De Francesco [this message]
2023-06-27 18:25 ` [Cluster-devel] [PATCH] gfs2: Replace deprecated kmap_atomic() by kmap_local_page() Deepak R Varma
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1905283.taCxCBeP46@suse \
--to=fmdefrancesco@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).