From: Mike Kravetz <mike.kravetz@oracle.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>,
akpm@linux-foundation.org, catalin.marinas@arm.com,
will@kernel.org
Cc: tsbogend@alpha.franken.de, James.Bottomley@HansenPartnership.com,
deller@gmx.de, mpe@ellerman.id.au, benh@kernel.crashing.org,
paulus@samba.org, hca@linux.ibm.com, gor@linux.ibm.com,
agordeev@linux.ibm.com, borntraeger@linux.ibm.com,
svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org,
davem@davemloft.net, arnd@arndb.de,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
linux-arch@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/3] mm: change huge_ptep_clear_flush() to return the original pte
Date: Thu, 5 May 2022 16:15:26 -0700 [thread overview]
Message-ID: <495c4ebe-a5b4-afb6-4cb0-956c1b18d0cc@oracle.com> (raw)
In-Reply-To: <a9038435d408cd7b9defe143537de668dfdf03be.1651216964.git.baolin.wang@linux.alibaba.com>
On 4/29/22 01:14, Baolin Wang wrote:
> It is incorrect to use ptep_clear_flush() to nuke a hugetlb page
> table when unmapping or migrating a hugetlb page, and will change
> to use huge_ptep_clear_flush() instead in the following patches.
>
> So this is a preparation patch, which changes the huge_ptep_clear_flush()
> to return the original pte to help to nuke a hugetlb page table.
>
> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> ---
> arch/arm64/include/asm/hugetlb.h | 4 ++--
> arch/arm64/mm/hugetlbpage.c | 12 +++++-------
> arch/ia64/include/asm/hugetlb.h | 4 ++--
> arch/mips/include/asm/hugetlb.h | 9 ++++++---
> arch/parisc/include/asm/hugetlb.h | 4 ++--
> arch/powerpc/include/asm/hugetlb.h | 9 ++++++---
> arch/s390/include/asm/hugetlb.h | 6 +++---
> arch/sh/include/asm/hugetlb.h | 4 ++--
> arch/sparc/include/asm/hugetlb.h | 4 ++--
> include/asm-generic/hugetlb.h | 4 ++--
> 10 files changed, 32 insertions(+), 28 deletions(-)
The above changes look straight forward.
Happy that you Cc'ed impacted arch maintainers so they can at least
have a look.
The only user of huge_ptep_clear_flush() today is hugetlb_cow/wp() in
mm/hugetlb.c. Any reason why you did not change that code? At least
cast the return of huge_ptep_clear_flush() to void with a comment?
Not absolutely necessary.
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
--
Mike Kravetz
next prev parent reply other threads:[~2022-05-05 23:17 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-29 8:14 [PATCH 0/3] Fix CONT-PTE/PMD size hugetlb issue when unmapping or migrating Baolin Wang
2022-04-29 8:14 ` [PATCH 1/3] mm: change huge_ptep_clear_flush() to return the original pte Baolin Wang
2022-05-05 23:15 ` Mike Kravetz [this message]
2022-05-06 3:02 ` Baolin Wang
2022-04-29 8:14 ` [PATCH 2/3] mm: rmap: Fix CONT-PTE/PMD size hugetlb issue when migration Baolin Wang
2022-05-05 23:53 ` Mike Kravetz
2022-05-06 3:39 ` Baolin Wang
2022-05-06 17:56 ` Mike Kravetz
2022-05-07 2:33 ` Baolin Wang
2022-05-08 9:19 ` Baolin Wang
2022-04-29 8:14 ` [PATCH 3/3] mm: rmap: Fix CONT-PTE/PMD size hugetlb issue when unmapping Baolin Wang
2022-04-29 20:02 ` Gerald Schaefer
2022-04-30 3:22 ` Baolin Wang
2022-05-02 14:02 ` Gerald Schaefer
2022-05-03 2:19 ` Baolin Wang
2022-05-03 10:03 ` Gerald Schaefer
2022-05-03 13:33 ` Baolin Wang
2022-05-06 19:07 ` Mike Kravetz
2022-05-09 16:41 ` Peter Xu
2022-05-10 1:28 ` Baolin Wang
2022-05-06 18:55 ` Mike Kravetz
2022-05-07 1:32 ` Baolin Wang
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