From: David Hildenbrand <david@redhat.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Michal Hocko <mhocko@suse.com>,
Oscar Salvador <osalvador@suse.de>, Zi Yan <ziy@nvidia.com>,
Muchun Song <songmuchun@bytedance.com>,
Naoya Horiguchi <naoya.horiguchi@linux.dev>,
David Rientjes <rientjes@google.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v3 2/5] mm/cma: add cma_pages_valid to determine if pages are in CMA
Date: Tue, 5 Oct 2021 10:48:09 +0200 [thread overview]
Message-ID: <7649db4a-fd21-46c4-efbc-a98893b72104@redhat.com> (raw)
In-Reply-To: <20211001175210.45968-3-mike.kravetz@oracle.com>
On 01.10.21 19:52, Mike Kravetz wrote:
> Add new interface cma_pages_valid() which indicates if the specified
> pages are part of a CMA region. This interface will be used in a
> subsequent patch by hugetlb code.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
> ---
> include/linux/cma.h | 1 +
> mm/cma.c | 21 +++++++++++++++++----
> 2 files changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index 53fd8c3cdbd0..bd801023504b 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -46,6 +46,7 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
> struct cma **res_cma);
> extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
> bool no_warn);
> +extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
> extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
>
> extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
> diff --git a/mm/cma.c b/mm/cma.c
> index 995e15480937..960994b88c7f 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -524,6 +524,22 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
> return page;
> }
>
> +bool cma_pages_valid(struct cma *cma, const struct page *pages,
> + unsigned long count)
> +{
> + unsigned long pfn;
> +
> + if (!cma || !pages)
> + return false;
> +
> + pfn = page_to_pfn(pages);
> +
> + if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count)
> + return false;
> +
> + return true;
> +}
> +
> /**
> * cma_release() - release allocated pages
> * @cma: Contiguous memory region for which the allocation is performed.
> @@ -539,16 +555,13 @@ bool cma_release(struct cma *cma, const struct page *pages,
> {
> unsigned long pfn;
>
> - if (!cma || !pages)
> + if (!cma_pages_valid(cma, pages, count))
> return false;
>
> pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count);
>
> pfn = page_to_pfn(pages);
>
> - if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count)
> - return false;
> -
> VM_BUG_ON(pfn + count > cma->base_pfn + cma->count);
>
> free_contig_range(pfn, count);
>
Agreed that we might want to perform the pr_debug() now earlier, or do
another pr_warn before returning false.
Acked-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-10-05 8:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 17:52 [PATCH v3 0/5] hugetlb: add demote/split page functionality Mike Kravetz
2021-10-01 17:52 ` [PATCH v3 1/5] hugetlb: add demote hugetlb page sysfs interfaces Mike Kravetz
2021-10-04 13:00 ` Oscar Salvador
2021-10-04 18:27 ` Mike Kravetz
2021-10-05 8:23 ` Oscar Salvador
2021-10-05 16:58 ` Mike Kravetz
2021-10-01 17:52 ` [PATCH v3 2/5] mm/cma: add cma_pages_valid to determine if pages are in CMA Mike Kravetz
2021-10-05 8:45 ` Oscar Salvador
2021-10-05 17:06 ` Mike Kravetz
2021-10-05 8:48 ` David Hildenbrand [this message]
2021-10-01 17:52 ` [PATCH v3 3/5] hugetlb: be sure to free demoted CMA pages to CMA Mike Kravetz
2021-10-05 9:33 ` Oscar Salvador
2021-10-05 18:57 ` Mike Kravetz
2021-10-06 7:54 ` Oscar Salvador
2021-10-06 18:27 ` Mike Kravetz
2021-10-01 17:52 ` [PATCH v3 4/5] hugetlb: add demote bool to gigantic page routines Mike Kravetz
2021-10-01 17:52 ` [PATCH v3 5/5] hugetlb: add hugetlb demote page support Mike Kravetz
2021-10-06 8:41 ` Oscar Salvador
2021-10-06 18:52 ` Mike Kravetz
2021-10-07 7:52 ` Oscar Salvador
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