From: Dan Williams <dan.j.williams@intel.com>
To: Joao Martins <joao.m.martins@oracle.com>
Cc: Linux MM <linux-mm@kvack.org>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Naoya Horiguchi <naoya.horiguchi@nec.com>,
Matthew Wilcox <willy@infradead.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
John Hubbard <jhubbard@nvidia.com>,
Jane Chu <jane.chu@oracle.com>,
Muchun Song <songmuchun@bytedance.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
Linux NVDIMM <nvdimm@lists.linux.dev>,
Linux Doc Mailing List <linux-doc@vger.kernel.org>
Subject: Re: [PATCH v3 06/14] mm/sparse-vmemmap: refactor core of vmemmap_populate_basepages() to helper
Date: Tue, 27 Jul 2021 23:04:57 -0700 [thread overview]
Message-ID: <CAPcyv4j=gqdkj-hT1dD5jyndG=P9DogUH7Ptr-aDeAk7uacpCQ@mail.gmail.com> (raw)
In-Reply-To: <20210714193542.21857-7-joao.m.martins@oracle.com>
On Wed, Jul 14, 2021 at 12:36 PM Joao Martins <joao.m.martins@oracle.com> wrote:
>
> In preparation for describing a memmap with compound pages, move the
> actual pte population logic into a separate function
> vmemmap_populate_address() and have vmemmap_populate_basepages() walk
> through all base pages it needs to populate.
>
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> ---
> mm/sparse-vmemmap.c | 44 ++++++++++++++++++++++++++------------------
> 1 file changed, 26 insertions(+), 18 deletions(-)
>
> diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
> index 80d3ba30d345..76f4158f6301 100644
> --- a/mm/sparse-vmemmap.c
> +++ b/mm/sparse-vmemmap.c
> @@ -570,33 +570,41 @@ pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)
> return pgd;
> }
>
> -int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end,
> - int node, struct vmem_altmap *altmap)
> +static int __meminit vmemmap_populate_address(unsigned long addr, int node,
> + struct vmem_altmap *altmap)
> {
> - unsigned long addr = start;
> pgd_t *pgd;
> p4d_t *p4d;
> pud_t *pud;
> pmd_t *pmd;
> pte_t *pte;
>
> + pgd = vmemmap_pgd_populate(addr, node);
> + if (!pgd)
> + return -ENOMEM;
> + p4d = vmemmap_p4d_populate(pgd, addr, node);
> + if (!p4d)
> + return -ENOMEM;
> + pud = vmemmap_pud_populate(p4d, addr, node);
> + if (!pud)
> + return -ENOMEM;
> + pmd = vmemmap_pmd_populate(pud, addr, node);
> + if (!pmd)
> + return -ENOMEM;
> + pte = vmemmap_pte_populate(pmd, addr, node, altmap);
> + if (!pte)
> + return -ENOMEM;
> + vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
Missing a return here:
mm/sparse-vmemmap.c:598:1: error: control reaches end of non-void
function [-Werror=return-type]
Yes, it's fixed up in a later patch, but might as well not leave the
bisect breakage lying around, and the kbuild robot would gripe about
this eventually as well.
> +}
> +
> +int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end,
> + int node, struct vmem_altmap *altmap)
> +{
> + unsigned long addr = start;
> +
> for (; addr < end; addr += PAGE_SIZE) {
> - pgd = vmemmap_pgd_populate(addr, node);
> - if (!pgd)
> - return -ENOMEM;
> - p4d = vmemmap_p4d_populate(pgd, addr, node);
> - if (!p4d)
> - return -ENOMEM;
> - pud = vmemmap_pud_populate(p4d, addr, node);
> - if (!pud)
> - return -ENOMEM;
> - pmd = vmemmap_pmd_populate(pud, addr, node);
> - if (!pmd)
> - return -ENOMEM;
> - pte = vmemmap_pte_populate(pmd, addr, node, altmap);
> - if (!pte)
> + if (vmemmap_populate_address(addr, node, altmap))
> return -ENOMEM;
I'd prefer:
rc = vmemmap_populate_address(addr, node, altmap);
if (rc)
return rc;
...in case future refactoring adds different error codes to pass up.
> - vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
> }
>
> return 0;
> --
> 2.17.1
>
next prev parent reply other threads:[~2021-07-28 6:05 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 19:35 [PATCH v3 00/14] mm, sparse-vmemmap: Introduce compound pagemaps Joao Martins
2021-07-14 19:35 ` [PATCH v3 01/14] memory-failure: fetch compound_head after pgmap_pfn_valid() Joao Martins
2021-07-15 0:17 ` Dan Williams
2021-07-15 2:51 ` [External] " Muchun Song
2021-07-15 6:40 ` Christoph Hellwig
2021-07-15 9:19 ` Muchun Song
2021-07-15 13:17 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 02/14] mm/page_alloc: split prep_compound_page into head and tail subparts Joao Martins
2021-07-15 0:19 ` Dan Williams
2021-07-15 2:53 ` [External] " Muchun Song
2021-07-15 13:17 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 03/14] mm/page_alloc: refactor memmap_init_zone_device() page init Joao Martins
2021-07-15 0:20 ` Dan Williams
2021-07-14 19:35 ` [PATCH v3 04/14] mm/memremap: add ZONE_DEVICE support for compound pages Joao Martins
2021-07-15 1:08 ` Dan Williams
2021-07-15 12:52 ` Joao Martins
2021-07-15 13:06 ` Joao Martins
2021-07-15 19:48 ` Dan Williams
2021-07-30 16:13 ` Joao Martins
2021-07-22 0:38 ` Jane Chu
2021-07-22 10:56 ` Joao Martins
2021-07-15 12:59 ` Christoph Hellwig
2021-07-15 13:15 ` Joao Martins
2021-07-15 6:48 ` Christoph Hellwig
2021-07-15 13:15 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 05/14] mm/sparse-vmemmap: add a pgmap argument to section activation Joao Martins
2021-07-28 5:56 ` Dan Williams
2021-07-28 9:43 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 06/14] mm/sparse-vmemmap: refactor core of vmemmap_populate_basepages() to helper Joao Martins
2021-07-28 6:04 ` Dan Williams [this message]
2021-07-28 10:48 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 07/14] mm/hugetlb_vmemmap: move comment block to Documentation/vm Joao Martins
2021-07-15 2:47 ` [External] " Muchun Song
2021-07-15 13:16 ` Joao Martins
2021-07-28 6:09 ` Dan Williams
2021-07-14 19:35 ` [PATCH v3 08/14] mm/sparse-vmemmap: populate compound pagemaps Joao Martins
2021-07-28 6:55 ` Dan Williams
2021-07-28 15:35 ` Joao Martins
2021-07-28 18:03 ` Dan Williams
2021-07-28 18:54 ` Joao Martins
2021-07-28 20:04 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 09/14] mm/page_alloc: reuse tail struct pages for " Joao Martins
2021-07-28 7:28 ` Dan Williams
2021-07-28 15:56 ` Joao Martins
2021-07-28 16:08 ` Dan Williams
2021-07-28 16:12 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 10/14] device-dax: use ALIGN() for determining pgoff Joao Martins
2021-07-28 7:29 ` Dan Williams
2021-07-28 15:56 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 11/14] device-dax: ensure dev_dax->pgmap is valid for dynamic devices Joao Martins
2021-07-28 7:30 ` Dan Williams
2021-07-28 15:56 ` Joao Martins
2021-08-06 12:28 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 12/14] device-dax: compound pagemap support Joao Martins
2021-07-14 23:36 ` Dan Williams
2021-07-15 12:00 ` Joao Martins
2021-07-27 23:51 ` Dan Williams
2021-07-28 9:36 ` Joao Martins
2021-07-28 18:51 ` Dan Williams
2021-07-28 18:59 ` Joao Martins
2021-07-28 19:03 ` Dan Williams
2021-07-14 19:35 ` [PATCH v3 13/14] mm/gup: grab head page refcount once for group of subpages Joao Martins
2021-07-28 19:55 ` Dan Williams
2021-07-28 20:07 ` Joao Martins
2021-07-28 20:23 ` Dan Williams
2021-08-25 19:10 ` Joao Martins
2021-08-25 19:15 ` Matthew Wilcox
2021-08-25 19:26 ` Joao Martins
2021-07-14 19:35 ` [PATCH v3 14/14] mm/sparse-vmemmap: improve memory savings for compound pud geometry Joao Martins
2021-07-28 20:03 ` Dan Williams
2021-07-28 20:08 ` Joao Martins
2021-07-14 21:48 ` [PATCH v3 00/14] mm, sparse-vmemmap: Introduce compound pagemaps Andrew Morton
2021-07-14 23:47 ` Dan Williams
2021-07-22 2:24 ` Matthew Wilcox
2021-07-22 10:53 ` Joao Martins
2021-07-27 23:23 ` Dan Williams
2021-08-02 10:40 ` Joao Martins
2021-08-02 14:06 ` Dan Williams
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