linux-kernel - [PATCH v3 01/15] mm: do code cleanups to filemap_map

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]

Date:   Wed, 10 Nov 2021 18:54:14 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, tglx@...utronix.de,
        kirill.shutemov@...ux.intel.com, mika.penttila@...tfour.com,
        david@...hat.com, jgg@...dia.com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, songmuchun@...edance.com,
        zhouchengming@...edance.com, Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v3 01/15] mm: do code cleanups to filemap_map_pmd()

Currently we have two times the same few lines repeated
in filemap_map_pmd(). Deduplicate them and fix some code
style issues.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 mm/filemap.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index daa0e23a6ee6..07c654202870 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3203,11 +3203,8 @@ static bool filemap_map_pmd(struct vm_fault *vmf, struct page *page)
 	struct mm_struct *mm = vmf->vma->vm_mm;
 
 	/* Huge page is mapped? No need to proceed. */
-	if (pmd_trans_huge(*vmf->pmd)) {
-		unlock_page(page);
-		put_page(page);
-		return true;
-	}
+	if (pmd_trans_huge(*vmf->pmd))
+		goto out;
 
 	if (pmd_none(*vmf->pmd) && PageTransHuge(page)) {
 		vm_fault_t ret = do_set_pmd(vmf, page);
@@ -3222,13 +3219,15 @@ static bool filemap_map_pmd(struct vm_fault *vmf, struct page *page)
 		pmd_install(mm, vmf->pmd, &vmf->prealloc_pte);
 
 	/* See comment in handle_pte_fault() */
-	if (pmd_devmap_trans_unstable(vmf->pmd)) {
-		unlock_page(page);
-		put_page(page);
-		return true;
-	}
+	if (pmd_devmap_trans_unstable(vmf->pmd))
+		goto out;
 
 	return false;
+
+out:
+	unlock_page(page);
+	put_page(page);
+	return true;
 }
 
 static struct page *next_uptodate_page(struct page *page,
-- 
2.11.0