linux-kernel - [PATCH v3 10/22] mm: add mmap_read_lock_killable

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: <20250820010415.699353-11-anthony.yznaga@oracle.com>
Date: Tue, 19 Aug 2025 18:04:03 -0700
From: Anthony Yznaga <anthony.yznaga@...cle.com>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, andreyknvl@...il.com, arnd@...db.de,
        bp@...en8.de, brauner@...nel.org, bsegall@...gle.com, corbet@....net,
        dave.hansen@...ux.intel.com, david@...hat.com,
        dietmar.eggemann@....com, ebiederm@...ssion.com, hpa@...or.com,
        jakub.wartak@...lbox.org, jannh@...gle.com, juri.lelli@...hat.com,
        khalid@...nel.org, liam.howlett@...cle.com, linyongting@...edance.com,
        lorenzo.stoakes@...cle.com, luto@...nel.org, markhemm@...glemail.com,
        maz@...nel.org, mhiramat@...nel.org, mgorman@...e.de, mhocko@...e.com,
        mingo@...hat.com, muchun.song@...ux.dev, neilb@...e.de,
        osalvador@...e.de, pcc@...gle.com, peterz@...radead.org,
        pfalcato@...e.de, rostedt@...dmis.org, rppt@...nel.org,
        shakeel.butt@...ux.dev, surenb@...gle.com, tglx@...utronix.de,
        vasily.averin@...ux.dev, vbabka@...e.cz, vincent.guittot@...aro.org,
        viro@...iv.linux.org.uk, vschneid@...hat.com, willy@...radead.org,
        x86@...nel.org, xhao@...ux.alibaba.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: [PATCH v3 10/22] mm: add mmap_read_lock_killable_nested()

This will be used to support mshare functionality where the read
lock on an mshare host mm is taken while holding the lock on a
process mm.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 include/linux/mmap_lock.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 2c9fffa58714..3cf7219306a1 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -369,6 +369,13 @@ static inline void mmap_read_lock(struct mm_struct *mm)
 	__mmap_lock_trace_acquire_returned(mm, false, true);
 }
 
+static inline void mmap_read_lock_nested(struct mm_struct *mm, int subclass)
+{
+	__mmap_lock_trace_start_locking(mm, false);
+	down_read_nested(&mm->mmap_lock, subclass);
+	__mmap_lock_trace_acquire_returned(mm, false, true);
+}
+
 static inline int mmap_read_lock_killable(struct mm_struct *mm)
 {
 	int ret;
-- 
2.47.1