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Message-Id: <20240322171456.118997-1-sj@kernel.org>
Date: Fri, 22 Mar 2024 10:14:56 -0700
From: SeongJae Park <sj@...nel.org>
To: peterx@...hat.com
Cc: linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
Michael Ellerman <mpe@...erman.id.au>,
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Axel Rasmussen <axelrasmussen@...gle.com>,
Yang Shi <shy828301@...il.com>,
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linux-arm-kernel@...ts.infradead.org,
"Kirill A . Shutemov" <kirill@...temov.name>,
Andrew Jones <andrew.jones@...ux.dev>,
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Mike Rapoport <rppt@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Muchun Song <muchun.song@...ux.dev>,
Christoph Hellwig <hch@...radead.org>,
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David Hildenbrand <david@...hat.com>,
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"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH v3 03/12] mm: Make HPAGE_PXD_* macros even if !THP
Hi Peter,
On Thu, 21 Mar 2024 18:07:53 -0400 peterx@...hat.com wrote:
> From: Peter Xu <peterx@...hat.com>
>
> These macros can be helpful when we plan to merge hugetlb code into generic
> code. Move them out and define them even if !THP.
>
> We actually already defined HPAGE_PMD_NR for other reasons even if !THP.
> Reorganize these macros.
>
> Reviewed-by: Christoph Hellwig <hch@...radead.org>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
> include/linux/huge_mm.h | 17 ++++++-----------
> 1 file changed, 6 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index de0c89105076..3bcdfc7e5d57 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -64,9 +64,6 @@ ssize_t single_hugepage_flag_show(struct kobject *kobj,
> enum transparent_hugepage_flag flag);
> extern struct kobj_attribute shmem_enabled_attr;
>
> -#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> -#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
> -
> /*
> * Mask of all large folio orders supported for anonymous THP; all orders up to
> * and including PMD_ORDER, except order-0 (which is not "huge") and order-1
> @@ -87,14 +84,19 @@ extern struct kobj_attribute shmem_enabled_attr;
> #define thp_vma_allowable_order(vma, vm_flags, smaps, in_pf, enforce_sysfs, order) \
> (!!thp_vma_allowable_orders(vma, vm_flags, smaps, in_pf, enforce_sysfs, BIT(order)))
>
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> #define HPAGE_PMD_SHIFT PMD_SHIFT
> #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
> #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
> +#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> +#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
>
> #define HPAGE_PUD_SHIFT PUD_SHIFT
> #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
> #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
> +#define HPAGE_PUD_ORDER (HPAGE_PUD_SHIFT-PAGE_SHIFT)
> +#define HPAGE_PUD_NR (1<<HPAGE_PUD_ORDER)
I just found latest mm-unstable fails one of my build configurations[1] with
below error. 'git bisect' says this is the first patch set started the
failure. I haven't looked in deep, but just reporting first.
In file included from .../include/linux/mm.h:1115,
from .../mm/vmstat.c:14:
.../mm/vmstat.c: In function 'zoneinfo_show_print':
.../include/linux/huge_mm.h:87:25: error: 'PMD_SHIFT' undeclared (first use in this function); did you mean 'PUD_SHIFT'?
87 | #define HPAGE_PMD_SHIFT PMD_SHIFT
| ^~~~~~~~~
[1] https://github.com/awslabs/damon-tests/blob/next/corr/tests/build_m68k.sh
Thanks,
SJ
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