From: Greg KH <gregkh@linuxfoundation.org>
To: Will Deacon <will.deacon@arm.com>
Cc: stable@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH] arm64: proc: Set PTE_NG for table entries to avoid traversing them twice
Date: Tue, 20 Feb 2018 16:29:01 +0100 [thread overview]
Message-ID: <20180220152901.GA30387@kroah.com> (raw)
In-Reply-To: <1519126806-16595-1-git-send-email-will.deacon@arm.com>
On Tue, Feb 20, 2018 at 11:40:06AM +0000, Will Deacon wrote:
> Commit 2ce77f6d8a9ae9ce6d80397d88bdceb84a2004cd upstream.
>
> When KASAN is enabled, the swapper page table contains many identical
> mappings of the zero page, which can lead to a stall during boot whilst
> the G -> nG code continually walks the same page table entries looking
> for global mappings.
>
> This patch sets the nG bit (bit 11, which is IGNORED) in table entries
> after processing the subtree so we can easily skip them if we see them
> a second time.
>
> Cc: <stable@vger.kernel.org> # 4.14+
Now queued up, thanks.
greg k-h
next prev parent reply other threads:[~2018-02-20 15:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-20 11:40 [PATCH] arm64: proc: Set PTE_NG for table entries to avoid traversing them twice Will Deacon
2018-02-20 15:29 ` Greg KH [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-02-13 13:14 Will Deacon
2018-02-14 18:55 ` Catalin Marinas
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=20180220152901.GA30387@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=catalin.marinas@arm.com \
--cc=stable@vger.kernel.org \
--cc=will.deacon@arm.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.