From: Liam Howlett <liam.howlett@oracle.com>
To: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Michel Lespinasse <walken.cr@gmail.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH] mmap_lock: Change trace and locking order
Date: Fri, 3 Sep 2021 01:35:31 +0000 [thread overview]
Message-ID: <20210903013521.1802774-1-Liam.Howlett@oracle.com> (raw)
Print to the trace log before releasing the lock to avoid racing with
other trace log printers of the same lock type.
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/linux/mmap_lock.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 0540f0156f58..5d2b343e39e7 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -101,14 +101,14 @@ static inline bool mmap_write_trylock(struct mm_struct *mm)
static inline void mmap_write_unlock(struct mm_struct *mm)
{
- up_write(&mm->mmap_lock);
__mmap_lock_trace_released(mm, true);
+ up_write(&mm->mmap_lock);
}
static inline void mmap_write_downgrade(struct mm_struct *mm)
{
- downgrade_write(&mm->mmap_lock);
__mmap_lock_trace_acquire_returned(mm, false, true);
+ downgrade_write(&mm->mmap_lock);
}
static inline void mmap_read_lock(struct mm_struct *mm)
@@ -140,8 +140,8 @@ static inline bool mmap_read_trylock(struct mm_struct *mm)
static inline void mmap_read_unlock(struct mm_struct *mm)
{
- up_read(&mm->mmap_lock);
__mmap_lock_trace_released(mm, false);
+ up_read(&mm->mmap_lock);
}
static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
--
2.30.2
next reply other threads:[~2021-09-03 1:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 1:35 Liam Howlett [this message]
2021-09-03 1:42 ` [PATCH] mmap_lock: Change trace and locking order Matthew Wilcox
2021-09-03 2:09 ` Liam Howlett
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