From: Ingo Molnar <mingo@kernel.org>
To: jglisse@redhat.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@kernel.org>,
Logan Gunthorpe <logang@deltatee.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] x86/mm/hotplug: fix BUG_ON() after hotremove by not freeing pud v3
Date: Mon, 26 Jun 2017 11:43:04 +0200 [thread overview]
Message-ID: <20170626094304.bmvsia5zpixbazpu@gmail.com> (raw)
In-Reply-To: <20170624180514.3821-1-jglisse@redhat.com>
* jglisse@redhat.com <jglisse@redhat.com> wrote:
> From: Jérôme Glisse <jglisse@redhat.com>
>
> With commit af2cf278ef4f we no longer free pud so that we do not
> have synchronize all pgd on hotremove/vfree. But the new 5 level
> page table patchset reverted that for 4 level page table.
>
> This patch restore af2cf278ef4f and disable free_pud() if we are
> in the 4 level page table case thus avoiding BUG_ON() after hot-
> remove.
>
> af2cf278ef4f x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()
Am I correct that the _real_ buggy commit that introduced the breakage in v4.12
is:
f2a6a7050109: ("x86: Convert the rest of the code to support p4d_t")
... right?
Thanks,
Ingo
next prev parent reply other threads:[~2017-06-26 9:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-24 18:05 [PATCH] x86/mm/hotplug: fix BUG_ON() after hotremove by not freeing pud v3 jglisse
2017-06-26 9:43 ` Ingo Molnar [this message]
2017-06-26 14:49 ` Jerome Glisse
2017-06-27 7:19 ` [tip:x86/urgent] x86/mm/hotplug: Fix BUG_ON() after hot-remove by not freeing PUD tip-bot for Jérôme Glisse
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=20170626094304.bmvsia5zpixbazpu@gmail.com \
--to=mingo@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=jglisse@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=logang@deltatee.com \
--cc=luto@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).