From nobody Sat Feb 7 20:39:36 2026 Received: from out-179.mta0.migadu.com (out-179.mta0.migadu.com [91.218.175.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1BC521B905 for ; Tue, 13 Jan 2026 01:42:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768268536; cv=none; b=oyO2uLQodLhljEkBebYz5StBsUX2q/So0LVSbcRdEx5bLL3vuodXlN4fNJjAfKBJ/ot7oWT8RCFG3ykr3qcXkgNBU9TbwEGnpfhDywQLSQFqelY1JJ58tYzktZptsP0VPngl0bPdrdWEvbJQ6TYykq4uAdSTRqkIX9Rd5HISfto= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768268536; c=relaxed/simple; bh=aVNLfXxdDxvhVX/V/4QOVKkhNsGsbhUT7XvuFA4ovr0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Xer45VihvYjFwB7x+b/8//RYQrHWwmovSSw/TodIjJzCRcQ5UmRodl9pSdgLcpwPOhnfG4rrbiG/2D3m/ZcGI3nkn6WhhD3femNcOGyvFnAZt1j4KTxY8QQNcX+WfYv8rMegbPpLdNR+ze/XV3iz5ho9pysJ5bfo+cP2ITkfdkY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=qQdsLnNT; arc=none smtp.client-ip=91.218.175.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="qQdsLnNT" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1768268522; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=nSg0Sr0i9/iYvNCth7dJcLGX3q29Co2e1nhK6hxIKwk=; b=qQdsLnNTTE+YrJwkG2yOWnHtvAm+Yz6NIIuLvq5zg9JTyNYbGlCgXhoeb5qUBlwb9WF/xf OY0BqSuNvMAROtLhxwfgff4ioqYEtWiVQa2DghEqknCoeia4Mzah4p9rNONsa1zMjqlijp /fh+8UELvGXP/yEGj7x6BG3MHVAL470= From: Ye Liu To: Andrew Morton , David Hildenbrand , "Matthew Wilcox (Oracle)" , Lorenzo Stoakes Cc: Ye Liu , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH] mm: remove redundant page parameter from do_set_pmd() Date: Tue, 13 Jan 2026 09:41:29 +0800 Message-ID: <20260113014130.922385-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Ye Liu The page parameter passed to do_set_pmd() was always overwritten with &folio->page immediately upon function entry (line 5369 in memory.c), making the parameter completely redundant. This confused callers who computed different page values only to have them ignored. Changes: - Convert page from a function parameter to a local variable - Update function signature in both implementations and stub - Remove unnecessary folio_file_page() calculation in filemap.c - Update all three call sites to remove the page argument This simplifies the API since folio already contains all the page information needed. The function still uses &folio->page internally for cache flushing and rmap operations. Signed-off-by: Ye Liu --- include/linux/mm.h | 2 +- mm/filemap.c | 3 +-- mm/khugepaged.c | 6 +++--- mm/memory.c | 7 ++++--- 4 files changed, 9 insertions(+), 9 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 710d20fc954b..cb1fe75575c3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1490,7 +1490,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct v= m_area_struct *vma) return pte; } =20 -vm_fault_t do_set_pmd(struct vm_fault *vmf, struct folio *folio, struct pa= ge *page); +vm_fault_t do_set_pmd(struct vm_fault *vmf, struct folio *folio); void set_pte_range(struct vm_fault *vmf, struct folio *folio, struct page *page, unsigned int nr, unsigned long addr); =20 diff --git a/mm/filemap.c b/mm/filemap.c index ebd75684cb0a..4be5f3f5b8d6 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3678,8 +3678,7 @@ static bool filemap_map_pmd(struct vm_fault *vmf, str= uct folio *folio, } =20 if (pmd_none(*vmf->pmd) && folio_test_pmd_mappable(folio)) { - struct page *page =3D folio_file_page(folio, start); - vm_fault_t ret =3D do_set_pmd(vmf, folio, page); + vm_fault_t ret =3D do_set_pmd(vmf, folio); if (!ret) { /* The page is mapped successfully, reference consumed. */ folio_unlock(folio); diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 9f790ec34400..2d7b23efa11b 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1442,7 +1442,7 @@ static void collect_mm_slot(struct mm_slot *slot) =20 /* folio must be locked, and mmap_lock must be held */ static enum scan_result set_huge_pmd(struct vm_area_struct *vma, unsigned = long addr, - pmd_t *pmdp, struct folio *folio, struct page *page) + pmd_t *pmdp, struct folio *folio) { struct mm_struct *mm =3D vma->vm_mm; struct vm_fault vmf =3D { @@ -1470,7 +1470,7 @@ static enum scan_result set_huge_pmd(struct vm_area_s= truct *vma, unsigned long a } =20 vmf.pmd =3D pmdp; - if (do_set_pmd(&vmf, folio, page)) + if (do_set_pmd(&vmf, folio)) return SCAN_FAIL; =20 folio_get(folio); @@ -1678,7 +1678,7 @@ static enum scan_result try_collapse_pte_mapped_thp(s= truct mm_struct *mm, unsign maybe_install_pmd: /* step 5: install pmd entry */ result =3D install_pmd - ? set_huge_pmd(vma, haddr, pmd, folio, &folio->page) + ? set_huge_pmd(vma, haddr, pmd, folio) : SCAN_SUCCEED; goto drop_folio; abort: diff --git a/mm/memory.c b/mm/memory.c index 30a897018482..8b29ecbfe7fa 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5342,8 +5342,9 @@ static void deposit_prealloc_pte(struct vm_fault *vmf) vmf->prealloc_pte =3D NULL; } =20 -vm_fault_t do_set_pmd(struct vm_fault *vmf, struct folio *folio, struct pa= ge *page) +vm_fault_t do_set_pmd(struct vm_fault *vmf, struct folio *folio) { + struct page *page; struct vm_area_struct *vma =3D vmf->vma; bool write =3D vmf->flags & FAULT_FLAG_WRITE; unsigned long haddr =3D vmf->address & HPAGE_PMD_MASK; @@ -5418,7 +5419,7 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct fo= lio *folio, struct page *pa return ret; } #else -vm_fault_t do_set_pmd(struct vm_fault *vmf, struct folio *folio, struct pa= ge *page) +vm_fault_t do_set_pmd(struct vm_fault *vmf, struct folio *folio) { return VM_FAULT_FALLBACK; } @@ -5542,7 +5543,7 @@ vm_fault_t finish_fault(struct vm_fault *vmf) =20 if (pmd_none(*vmf->pmd)) { if (!needs_fallback && folio_test_pmd_mappable(folio)) { - ret =3D do_set_pmd(vmf, folio, page); + ret =3D do_set_pmd(vmf, folio); if (ret !=3D VM_FAULT_FALLBACK) return ret; } --=20 2.43.0