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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vAda6-00000008t9Q-2Avk; Mon, 20 Oct 2025 00:16:58 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Vishal Moola , Johannes Weiner Subject: [RFC PATCH 4/7] pgtable: Remove uses of page->lru Date: Mon, 20 Oct 2025 01:16:39 +0100 Message-ID: <20251020001652.2116669-5-willy@infradead.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251020001652.2116669-1-willy@infradead.org> References: <20251020001652.2116669-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Stat-Signature: 7xwe57jbcpm6g6cf3aa6qcykq7xn6fdc X-Rspam-User: X-Rspamd-Queue-Id: 2E490A0003 X-HE-Tag: 1760919420-913858 X-HE-Meta: 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 YoFF1LXg fOS5DyZOS5RwBRE/DqGVVCplJ43++EwbogHLJOYSDJjypiBpAYNASOxN3cAm9JFCtpv86Yt35z2fpL3sk4tz2O0pxiYs76tSj/xRVGnMw/RNAHhkdf94p/m7fSGeeQM+m6Vako7TA/D68kTm6vKSZP/u2A0yneRrByz8zFT8A3GbvXiKUNNLp6390YAillKyvrwuxBXRzDf0MPrybUs641s8f0TOYBYpnEN2m4o1m8DJQ2iPBIXLYukXydOl87LMbSBLFRjDC6KUu8QnFETFsaEqTjAesWrMLrfoH3WJTgVqvFas= 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: Use ptdesc->pt_list instead of page->lru. These are the same bits for now, but will be different when ptdesc is allocated separately. Signed-off-by: Matthew Wilcox (Oracle) --- mm/pgtable-generic.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 567e2d084071..f40bab9e6c46 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -164,13 +164,14 @@ pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address, void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable) { + struct ptdesc *ptdesc = page_ptdesc(pgtable); assert_spin_locked(pmd_lockptr(mm, pmdp)); /* FIFO */ if (!pmd_huge_pte(mm, pmdp)) - INIT_LIST_HEAD(&pgtable->lru); + INIT_LIST_HEAD(&ptdesc->pt_list); else - list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru); + list_add(&ptdesc->pt_list, &page_ptdesc(pmd_huge_pte(mm, pmdp))->pt_list); pmd_huge_pte(mm, pmdp) = pgtable; } #endif @@ -179,17 +180,22 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, /* no "address" argument so destroys page coloring of some arch */ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) { - pgtable_t pgtable; + struct ptdesc *ptdesc, *next; + struct page *page; assert_spin_locked(pmd_lockptr(mm, pmdp)); /* FIFO */ - pgtable = pmd_huge_pte(mm, pmdp); - pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru, - struct page, lru); - if (pmd_huge_pte(mm, pmdp)) - list_del(&pgtable->lru); - return pgtable; + page = pmd_huge_pte(mm, pmdp); + ptdesc = page_ptdesc(page); + next = list_first_entry_or_null(&ptdesc->pt_list, struct ptdesc, pt_list); + if (next) { + pmd_huge_pte(mm, pmdp) = ptdesc_page(next); + list_del(&ptdesc->pt_list); + } else { + pmd_huge_pte(mm, pmdp) = NULL; + } + return page; } #endif -- 2.47.2