From: Catalin Marinas <catalin.marinas@arm.com>
To: Jianyong Wu <Jianyong.Wu@arm.com>
Cc: "will@kernel.org" <will@kernel.org>,
Anshuman Khandual <Anshuman.Khandual@arm.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"david@redhat.com" <david@redhat.com>,
"quic_qiancai@quicinc.com" <quic_qiancai@quicinc.com>,
"ardb@kernel.org" <ardb@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"gshan@redhat.com" <gshan@redhat.com>,
Justin He <Justin.He@arm.com>, nd <nd@arm.com>
Subject: Re: [PATCH v3] arm64/mm: avoid fixmap race condition when create pud mapping
Date: Fri, 7 Jan 2022 10:53:54 +0000 [thread overview]
Message-ID: <YdgbwpECTXGCJZ/0@arm.com> (raw)
In-Reply-To: <AM9PR08MB7276B412F02CA0431E30E06CF44D9@AM9PR08MB7276.eurprd08.prod.outlook.com>
On Fri, Jan 07, 2022 at 09:10:57AM +0000, Jianyong Wu wrote:
> I roughly find the root cause.
> alloc_init_pud will be called at the very beginning of kernel boot in
> create_mapping_noalloc where no memory allocator is initialized. But
> lockdep check may need allocate memory. So, kernel take exception
> when acquire lock.(I have not found the exact code that cause this
> issue) that's say we may not be able to use a lock so early.
I couldn't find an slab or page allocation place either. It would be
nice to get to the root cause rather than just avoiding the mutex on the
early boot path.
--
Catalin
prev parent reply other threads:[~2022-01-07 10:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-16 8:28 [PATCH v3] arm64/mm: avoid fixmap race condition when create pud mapping Jianyong Wu
2021-12-16 15:19 ` David Hildenbrand
2021-12-17 9:30 ` Mark Rutland
2021-12-17 10:09 ` Jianyong Wu
2022-01-05 18:03 ` Catalin Marinas
2022-01-06 10:13 ` Jianyong Wu
2022-01-06 15:56 ` Catalin Marinas
2022-01-07 9:10 ` Jianyong Wu
2022-01-07 10:42 ` Catalin Marinas
2022-01-26 4:20 ` Justin He
2022-01-26 8:36 ` Ard Biesheuvel
2022-01-26 10:09 ` Jianyong Wu
2022-01-26 10:12 ` Ard Biesheuvel
2022-01-26 10:17 ` David Hildenbrand
2022-01-26 10:28 ` Jianyong Wu
2022-01-26 10:30 ` David Hildenbrand
2022-01-26 10:31 ` David Hildenbrand
2022-01-27 6:24 ` Jianyong Wu
2022-01-27 12:22 ` David Hildenbrand
2022-01-27 12:34 ` Catalin Marinas
2022-01-31 8:13 ` Jianyong Wu
2022-01-31 8:10 ` Jianyong Wu
2022-01-27 1:31 ` Justin He
2022-01-07 10:53 ` Catalin Marinas [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=YdgbwpECTXGCJZ/0@arm.com \
--to=catalin.marinas@arm.com \
--cc=Anshuman.Khandual@arm.com \
--cc=Jianyong.Wu@arm.com \
--cc=Justin.He@arm.com \
--cc=akpm@linux-foundation.org \
--cc=ardb@kernel.org \
--cc=david@redhat.com \
--cc=gshan@redhat.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=nd@arm.com \
--cc=quic_qiancai@quicinc.com \
--cc=will@kernel.org \
/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).