linux-kernel - [PATCH v3 04/16] mm/huge_memory: use helper touch_pud in huge_pud_set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220704132201.14611-5-linmiaohe@huawei.com>
Date:   Mon, 4 Jul 2022 21:21:49 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <shy828301@...il.com>, <willy@...radead.org>, <zokeefe@...gle.com>,
        <songmuchun@...edance.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v3 04/16] mm/huge_memory: use helper touch_pud in huge_pud_set_accessed

Use helper touch_pud to set pud accessed to simplify the code and improve
the readability. No functional change intended.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/huge_memory.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 212e092d8ad0..30acb3b994cf 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1285,15 +1285,15 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 
 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 static void touch_pud(struct vm_area_struct *vma, unsigned long addr,
-		pud_t *pud, int flags)
+		      pud_t *pud, bool write)
 {
 	pud_t _pud;
 
 	_pud = pud_mkyoung(*pud);
-	if (flags & FOLL_WRITE)
+	if (write)
 		_pud = pud_mkdirty(_pud);
 	if (pudp_set_access_flags(vma, addr & HPAGE_PUD_MASK,
-				pud, _pud, flags & FOLL_WRITE))
+				  pud, _pud, write))
 		update_mmu_cache_pud(vma, addr, pud);
 }
 
@@ -1320,7 +1320,7 @@ struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
 		return NULL;
 
 	if (flags & FOLL_TOUCH)
-		touch_pud(vma, addr, pud, flags);
+		touch_pud(vma, addr, pud, flags & FOLL_WRITE);
 
 	/*
 	 * device mapped pages can only be returned if the
@@ -1385,21 +1385,13 @@ int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 
 void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
 {
-	pud_t entry;
-	unsigned long haddr;
 	bool write = vmf->flags & FAULT_FLAG_WRITE;
 
 	vmf->ptl = pud_lock(vmf->vma->vm_mm, vmf->pud);
 	if (unlikely(!pud_same(*vmf->pud, orig_pud)))
 		goto unlock;
 
-	entry = pud_mkyoung(orig_pud);
-	if (write)
-		entry = pud_mkdirty(entry);
-	haddr = vmf->address & HPAGE_PUD_MASK;
-	if (pudp_set_access_flags(vmf->vma, haddr, vmf->pud, entry, write))
-		update_mmu_cache_pud(vmf->vma, vmf->address, vmf->pud);
-
+	touch_pud(vmf->vma, vmf->address, vmf->pud, write);
 unlock:
 	spin_unlock(vmf->ptl);
 }
-- 
2.23.0