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Fri, 04 Jun 2021 18:06:30 -0700 (PDT) Date: Fri, 4 Jun 2021 18:06:26 -0700 In-Reply-To: <1fd32aad-c99d-e89a-cdb1-05843f568f0c@oracle.com> Message-Id: <20210605010626.1459873-1-almasrymina@google.com> Mime-Version: 1.0 References: <1fd32aad-c99d-e89a-cdb1-05843f568f0c@oracle.com> X-Mailer: git-send-email 2.32.0.rc1.229.g3e70b5a671-goog Subject: [PATCH] mm, hugetlb: fix allocation error check and copy func name From: Mina Almasry Cc: Mina Almasry , linux-mm@kvack.org, Mike Kravetz , Andrew Morton , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 280E6E0004F7 Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=TzMnsIeD; spf=pass (imf30.hostedemail.com: domain of 3Fs66YAsKCKkJUVJbahVRWJPXXPUN.LXVURWdg-VVTeJLT.XaP@flex--almasrymina.bounces.google.com designates 209.85.217.74 as permitted sender) smtp.mailfrom=3Fs66YAsKCKkJUVJbahVRWJPXXPUN.LXVURWdg-VVTeJLT.XaP@flex--almasrymina.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com X-Stat-Signature: crq5rqk4j1e36w4amieujebfh1je7jw4 X-HE-Tag: 1622862495-992218 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The alloc_huge_page_vma() doesn't return error pointers, it returns NULL. There is an existing migrate_page_copy() which not only copies the page contents, but also page state/metadata. People could get confused that 'migrate_page_copy' and 'migrate_copy_huge_page' do not have the same functionality. Rename to 'copy_huge_page()' to make it less likely folks get confused. Fixes: 6a0badc266df ("mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO_COPY") Signed-off-by: Mina Almasry Cc: linux-mm@kvack.org Cc: Mike Kravetz Cc: Andrew Morton Cc: linux-kernel@vger.kernel.org --- include/linux/migrate.h | 4 ++-- mm/hugetlb.c | 4 ++-- mm/migrate.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index e0b98876a52e..9b7b7cd3bae9 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -51,7 +51,7 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page); extern int migrate_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page, int extra_count); -extern void migrate_copy_huge_page(struct page *dst, struct page *src); +extern void copy_huge_page(struct page *dst, struct page *src); #else static inline void putback_movable_pages(struct list_head *l) {} @@ -78,7 +78,7 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping, return -ENOSYS; } -static inline void migrate_copy_huge_page(struct page *dst, struct page *src) +static inline void copy_huge_page(struct page *dst, struct page *src) { } #endif /* CONFIG_MIGRATION */ diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 64a460ff2d5b..637395907908 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -5130,7 +5130,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, * contents. */ page = alloc_huge_page_vma(h, dst_vma, dst_addr); - if (IS_ERR(page)) { + if (!page) { ret = -ENOMEM; goto out; } @@ -5156,7 +5156,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, *pagep = NULL; goto out; } - migrate_copy_huge_page(page, *pagep); + copy_huge_page(page, *pagep); put_page(*pagep); *pagep = NULL; } diff --git a/mm/migrate.c b/mm/migrate.c index 2515210a9747..51f355757490 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -557,7 +557,7 @@ static void __copy_gigantic_page(struct page *dst, struct page *src, } } -void migrate_copy_huge_page(struct page *dst, struct page *src) +void copy_huge_page(struct page *dst, struct page *src) { int i; int nr_pages; @@ -662,7 +662,7 @@ EXPORT_SYMBOL(migrate_page_states); void migrate_page_copy(struct page *newpage, struct page *page) { if (PageHuge(page) || PageTransHuge(page)) - migrate_copy_huge_page(newpage, page); + copy_huge_page(newpage, page); else copy_highpage(newpage, page); -- 2.32.0.rc1.229.g3e70b5a671-goog