From: Yang Shi <shy828301@gmail.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Linux MM <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] mm: thp: fix a double unlock bug
Date: Tue, 1 Jun 2021 10:30:17 -0700 [thread overview]
Message-ID: <CAHbLzkpkxJHVaihrPWV04ejgbaJU4xiN7xTvfHcn33cX6JcgYA@mail.gmail.com> (raw)
In-Reply-To: <YLX8uYN01JmfLnlK@mwanda>
On Tue, Jun 1, 2021 at 2:24 AM Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
> We're supposed to be holding the "vmf->ptl" spin_lock when we goto
> out_map. The lock is dropped after if finishes cleaning up.
>
> Fixes: 9aff7b33c74a ("mm: thp: refactor NUMA fault handling")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Thanks for catching this. Acked-by: Yang Shi <shy828301@gmail.com>
> ---
> mm/huge_memory.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index e353bbc6cee3..caa0148f15bb 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1465,10 +1465,8 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
>
> pmd = pmd_modify(oldpmd, vma->vm_page_prot);
> page = vm_normal_page_pmd(vma, haddr, pmd);
> - if (!page) {
> - spin_unlock(vmf->ptl);
> + if (!page)
> goto out_map;
> - }
>
> /* See similar comment in do_numa_page for explanation */
> if (!was_writable)
> --
> 2.30.2
>
prev parent reply other threads:[~2021-06-01 17:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 9:24 [PATCH] mm: thp: fix a double unlock bug Dan Carpenter
2021-06-01 10:08 ` Mel Gorman
2021-06-01 10:43 ` Dan Carpenter
2021-06-01 17:30 ` Yang Shi [this message]
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=CAHbLzkpkxJHVaihrPWV04ejgbaJU4xiN7xTvfHcn33cX6JcgYA@mail.gmail.com \
--to=shy828301@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=dan.carpenter@oracle.com \
--cc=kernel-janitors@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
/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 NNTP newsgroup(s).