The patch titled
Subject: mmap_lock: change trace and locking order
has been added to the -mm tree. Its filename is
mmap_lock-change-trace-and-locking-order.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mmap_lock-change-trace-and-locking-order.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mmap_lock-change-trace-and-locking-order.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: mmap_lock: change trace and locking order
Print to the trace log before releasing the lock to avoid racing with
other trace log printers of the same lock type.
Link: https://lkml.kernel.org/r/20210903022041.1843024-1-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Suggested-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Michel Lespinasse <walken.cr@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mmap_lock.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/include/linux/mmap_lock.h~mmap_lock-change-trace-and-locking-order
+++ a/include/linux/mmap_lock.h
@@ -101,14 +101,14 @@ static inline bool mmap_write_trylock(st
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(str
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)
@@ -155,8 +155,8 @@ static inline bool mmap_read_trylock_non
static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
{
- up_read_non_owner(&mm->mmap_lock);
__mmap_lock_trace_released(mm, false);
+ up_read_non_owner(&mm->mmap_lock);
}
static inline void mmap_assert_locked(struct mm_struct *mm)
_
Patches currently in -mm which might be from liam.howlett@xxxxxxxxxx are
mmap_lock-change-trace-and-locking-order.patch
