From: John Hubbard <jhubbard@nvidia.com>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>, linux-mm@kvack.org
Cc: Christoph Hellwig <hch@infradead.org>,
William Kucharski <william.kucharski@oracle.com>,
linux-kernel@vger.kernel.org, Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [PATCH v2 18/28] hugetlb: Use try_grab_folio() instead of try_grab_compound_head()
Date: Mon, 10 Jan 2022 22:47:23 -0800 [thread overview]
Message-ID: <a35eb904-aa1d-8f70-c868-8e50b791118b@nvidia.com> (raw)
In-Reply-To: <20220110042406.499429-19-willy@infradead.org>
On 1/9/22 20:23, Matthew Wilcox (Oracle) wrote:
> follow_hugetlb_page() only cares about success or failure, so it doesn't
> need to know the type of the returned pointer, only whether it's NULL
> or not.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
> include/linux/mm.h | 3 ---
> mm/gup.c | 2 +-
> mm/hugetlb.c | 7 +++----
> 3 files changed, 4 insertions(+), 8 deletions(-)
>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
thanks,
--
John Hubbard
NVIDIA
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index b249156f7cf1..c103c6401ecd 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1195,9 +1195,6 @@ static inline void get_page(struct page *page)
> }
>
> bool __must_check try_grab_page(struct page *page, unsigned int flags);
> -struct page *try_grab_compound_head(struct page *page, int refs,
> - unsigned int flags);
> -
>
> static inline __must_check bool try_get_page(struct page *page)
> {
> diff --git a/mm/gup.c b/mm/gup.c
> index 719252fa0402..20703de2f107 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -146,7 +146,7 @@ struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags)
> return NULL;
> }
>
> -struct page *try_grab_compound_head(struct page *page,
> +static inline struct page *try_grab_compound_head(struct page *page,
> int refs, unsigned int flags)
> {
> return &try_grab_folio(page, refs, flags)->page;
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index abcd1785c629..ab67b13c4a71 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -6072,7 +6072,7 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
>
> if (pages) {
> /*
> - * try_grab_compound_head() should always succeed here,
> + * try_grab_folio() should always succeed here,
> * because: a) we hold the ptl lock, and b) we've just
> * checked that the huge page is present in the page
> * tables. If the huge page is present, then the tail
> @@ -6081,9 +6081,8 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
> * any way. So this page must be available at this
> * point, unless the page refcount overflowed:
> */
> - if (WARN_ON_ONCE(!try_grab_compound_head(pages[i],
> - refs,
> - flags))) {
> + if (WARN_ON_ONCE(!try_grab_folio(pages[i], refs,
> + flags))) {
> spin_unlock(ptl);
> remainder = 0;
> err = -ENOMEM;
next prev parent reply other threads:[~2022-01-11 6:47 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-10 4:23 [PATCH v2 00/28] Convert GUP to folios Matthew Wilcox (Oracle)
2022-01-10 4:23 ` [PATCH v2 01/28] gup: Remove for_each_compound_range() Matthew Wilcox (Oracle)
2022-01-10 8:22 ` Christoph Hellwig
2022-01-11 1:07 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 02/28] gup: Remove for_each_compound_head() Matthew Wilcox (Oracle)
2022-01-10 8:23 ` Christoph Hellwig
2022-01-11 1:11 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 03/28] gup: Change the calling convention for compound_range_next() Matthew Wilcox (Oracle)
2022-01-10 8:25 ` Christoph Hellwig
2022-01-11 1:14 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 04/28] gup: Optimise compound_range_next() Matthew Wilcox (Oracle)
2022-01-10 8:26 ` Christoph Hellwig
2022-01-11 1:16 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 05/28] gup: Change the calling convention for compound_next() Matthew Wilcox (Oracle)
2022-01-10 8:27 ` Christoph Hellwig
2022-01-10 13:28 ` Matthew Wilcox
2022-01-11 1:18 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 06/28] gup: Fix some contiguous memmap assumptions Matthew Wilcox (Oracle)
2022-01-10 8:29 ` Christoph Hellwig
2022-01-10 13:37 ` Matthew Wilcox
2022-01-10 19:05 ` [External] : " Mike Kravetz
2022-01-11 1:47 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 07/28] gup: Remove an assumption of a contiguous memmap Matthew Wilcox (Oracle)
2022-01-10 8:30 ` Christoph Hellwig
2022-01-11 3:27 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 08/28] gup: Handle page split race more efficiently Matthew Wilcox (Oracle)
2022-01-10 8:31 ` Christoph Hellwig
2022-01-11 3:30 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 09/28] gup: Turn hpage_pincount_add() into page_pincount_add() Matthew Wilcox (Oracle)
2022-01-10 8:31 ` Christoph Hellwig
2022-01-11 3:35 ` John Hubbard
2022-01-11 4:32 ` John Hubbard
2022-01-11 13:46 ` Matthew Wilcox
2022-01-10 4:23 ` [PATCH v2 10/28] gup: Turn hpage_pincount_sub() into page_pincount_sub() Matthew Wilcox (Oracle)
2022-01-10 8:32 ` Christoph Hellwig
2022-01-11 6:40 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 11/28] mm: Make compound_pincount always available Matthew Wilcox (Oracle)
2022-01-11 4:06 ` John Hubbard
2022-01-11 4:38 ` Matthew Wilcox
2022-01-11 5:10 ` John Hubbard
2022-01-20 9:15 ` Christoph Hellwig
2022-01-10 4:23 ` [PATCH v2 12/28] mm: Add folio_put_refs() Matthew Wilcox (Oracle)
2022-01-10 8:32 ` Christoph Hellwig
2022-01-11 4:14 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 13/28] mm: Add folio_pincount_ptr() Matthew Wilcox (Oracle)
2022-01-10 8:33 ` Christoph Hellwig
2022-01-11 4:22 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 14/28] mm: Convert page_maybe_dma_pinned() to use a folio Matthew Wilcox (Oracle)
2022-01-10 8:33 ` Christoph Hellwig
2022-01-11 4:27 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 15/28] gup: Add try_get_folio() and try_grab_folio() Matthew Wilcox (Oracle)
2022-01-10 8:34 ` Christoph Hellwig
2022-01-11 5:00 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 16/28] mm: Remove page_cache_add_speculative() and page_cache_get_speculative() Matthew Wilcox (Oracle)
2022-01-10 8:35 ` Christoph Hellwig
2022-01-11 5:14 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 17/28] gup: Add gup_put_folio() Matthew Wilcox (Oracle)
2022-01-10 8:35 ` Christoph Hellwig
2022-01-11 6:44 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 18/28] hugetlb: Use try_grab_folio() instead of try_grab_compound_head() Matthew Wilcox (Oracle)
2022-01-10 8:36 ` Christoph Hellwig
2022-01-11 6:47 ` John Hubbard [this message]
2022-01-10 4:23 ` [PATCH v2 19/28] gup: Convert try_grab_page() to call try_grab_folio() Matthew Wilcox (Oracle)
2022-01-10 8:36 ` Christoph Hellwig
2022-01-11 7:01 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 20/28] gup: Convert gup_pte_range() to use a folio Matthew Wilcox (Oracle)
2022-01-10 8:37 ` Christoph Hellwig
2022-01-11 7:06 ` John Hubbard
2022-01-10 4:23 ` [PATCH v2 21/28] gup: Convert gup_hugepte() " Matthew Wilcox (Oracle)
2022-01-10 8:37 ` Christoph Hellwig
2022-01-11 7:33 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 22/28] gup: Convert gup_huge_pmd() " Matthew Wilcox (Oracle)
2022-01-10 8:37 ` Christoph Hellwig
2022-01-11 7:36 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 23/28] gup: Convert gup_huge_pud() " Matthew Wilcox (Oracle)
2022-01-10 8:38 ` Christoph Hellwig
2022-01-11 7:38 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 24/28] gup: Convert gup_huge_pgd() " Matthew Wilcox (Oracle)
2022-01-10 8:38 ` Christoph Hellwig
2022-01-11 7:38 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 25/28] gup: Convert compound_next() to gup_folio_next() Matthew Wilcox (Oracle)
2022-01-10 8:39 ` Christoph Hellwig
2022-01-11 7:41 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 26/28] gup: Convert compound_range_next() to gup_folio_range_next() Matthew Wilcox (Oracle)
2022-01-10 8:41 ` Christoph Hellwig
2022-01-10 13:41 ` Matthew Wilcox
2022-01-11 7:44 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 27/28] mm: Add isolate_lru_folio() Matthew Wilcox (Oracle)
2022-01-10 8:42 ` Christoph Hellwig
2022-01-11 7:49 ` John Hubbard
2022-01-10 4:24 ` [PATCH v2 28/28] gup: Convert check_and_migrate_movable_pages() to use a folio Matthew Wilcox (Oracle)
2022-01-10 8:42 ` Christoph Hellwig
2022-01-11 7:52 ` John Hubbard
2022-01-10 15:31 ` [PATCH v2 00/28] Convert GUP to folios Jason Gunthorpe
2022-01-10 16:09 ` Matthew Wilcox
2022-01-10 17:26 ` William Kucharski
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