archive mirror
 help / color / mirror / Atom feed
From: Michael Ellerman <>
To: Alexey Kardashevskiy <>,
Cc:, Alexey Kardashevskiy <>,
	Greg Kurz <>,,,
	Paul Mackerras <>,
	"Aneesh Kumar K . V" <>,
Subject: Re: [kernel,v2] powerpc/iommu: Do not call PageTransHuge() on tail pages
Date: Thu, 20 Apr 2017 08:04:19 +1000 (AEST)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 2017-04-11 at 07:54:57 UTC, Alexey Kardashevskiy wrote:
> The CMA pages migration code does not support compound pages at
> the moment so it performs few tests before proceeding to actual page
> migration.
> One of the tests - PageTransHuge() - has VM_BUG_ON_PAGE(PageTail()) as
> it is designed to be called on head pages only. Since we also test for
> PageCompound(), and it contains PageTail() and PageHead(), we can
> simplify the check by leaving just PageCompound() and therefore avoid
> possible VM_BUG_ON_PAGE.
> Fixes: 2e5bbb5461f1 ("KVM: PPC: Book3S HV: Migrate pinned pages out of CMA")
> Cc: # v4.9+
> Signed-off-by: Alexey Kardashevskiy <>
> Acked-by: Balbir Singh <>

Applied to powerpc next, thanks.


      parent reply	other threads:[~2017-04-19 22:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-11  7:54 [PATCH kernel v2] " Alexey Kardashevskiy
2017-04-11  8:20 ` Balbir Singh
2017-04-19 22:04 ` Michael Ellerman [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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \ \
    --subject='Re: [kernel,v2] powerpc/iommu: Do not call PageTransHuge() on tail pages' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

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).