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V" , Vlastimil Babka , James Houghton , Jason Gunthorpe , Mike Rapoport , Axel Rasmussen Subject: [PATCH v4 07/13] mm/gup: Refactor record_subpages() to find 1st small page Date: Wed, 27 Mar 2024 11:23:26 -0400 Message-ID: <20240327152332.950956-8-peterx@redhat.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240327152332.950956-1-peterx@redhat.com> References: <20240327152332.950956-1-peterx@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: 8F2EA140026 X-Rspam-User: X-Stat-Signature: pyiufysnsogyrh1ij86riq7ww51rsjn3 X-Rspamd-Server: rspam03 X-HE-Tag: 1711553034-277285 X-HE-Meta: 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 KwY31Jkm EWqHxEPQHH9bwBq5SmsbgW8Yf36QZcxY7Gz7ucSwsJbUEZwvYLbDVlhBweASbq05MVTPYeBiw8t0hAiHhen9VqxXqGYBDHThelAkWzABJGupdH+2WSt6TdPWfQJIZNRIRzF9qgIvLq+uU86E= 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: List-Subscribe: List-Unsubscribe: From: Peter Xu All the fast-gup functions take a tail page to operate, always need to do page mask calculations before feeding that into record_subpages(). Merge that logic into record_subpages(), so that it will do the nth_page() calculation. Reviewed-by: Jason Gunthorpe Signed-off-by: Peter Xu --- mm/gup.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index db35b056fc9a..c2881772216b 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2779,13 +2779,16 @@ static int __gup_device_huge_pud(pud_t pud, pud_t *pudp, unsigned long addr, } #endif -static int record_subpages(struct page *page, unsigned long addr, - unsigned long end, struct page **pages) +static int record_subpages(struct page *page, unsigned long sz, + unsigned long addr, unsigned long end, + struct page **pages) { + struct page *start_page; int nr; + start_page = nth_page(page, (addr & (sz - 1)) >> PAGE_SHIFT); for (nr = 0; addr != end; nr++, addr += PAGE_SIZE) - pages[nr] = nth_page(page, nr); + pages[nr] = nth_page(start_page, nr); return nr; } @@ -2820,8 +2823,8 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, /* hugepages are never "special" */ VM_BUG_ON(!pfn_valid(pte_pfn(pte))); - page = nth_page(pte_page(pte), (addr & (sz - 1)) >> PAGE_SHIFT); - refs = record_subpages(page, addr, end, pages + *nr); + page = pte_page(pte); + refs = record_subpages(page, sz, addr, end, pages + *nr); folio = try_grab_folio(page, refs, flags); if (!folio) @@ -2894,8 +2897,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, pages, nr); } - page = nth_page(pmd_page(orig), (addr & ~PMD_MASK) >> PAGE_SHIFT); - refs = record_subpages(page, addr, end, pages + *nr); + page = pmd_page(orig); + refs = record_subpages(page, PMD_SIZE, addr, end, pages + *nr); folio = try_grab_folio(page, refs, flags); if (!folio) @@ -2938,8 +2941,8 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr, pages, nr); } - page = nth_page(pud_page(orig), (addr & ~PUD_MASK) >> PAGE_SHIFT); - refs = record_subpages(page, addr, end, pages + *nr); + page = pud_page(orig); + refs = record_subpages(page, PUD_SIZE, addr, end, pages + *nr); folio = try_grab_folio(page, refs, flags); if (!folio) @@ -2978,8 +2981,8 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr, BUILD_BUG_ON(pgd_devmap(orig)); - page = nth_page(pgd_page(orig), (addr & ~PGDIR_MASK) >> PAGE_SHIFT); - refs = record_subpages(page, addr, end, pages + *nr); + page = pgd_page(orig); + refs = record_subpages(page, PGDIR_SIZE, addr, end, pages + *nr); folio = try_grab_folio(page, refs, flags); if (!folio) -- 2.44.0