]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
mmap_lock: change trace and locking order
authorLiam Howlett <liam.howlett@oracle.com>
Thu, 9 Sep 2021 01:10:14 +0000 (18:10 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 9 Sep 2021 01:45:53 +0000 (18:45 -0700)
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@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michel Lespinasse <walken.cr@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mmap_lock.h

index 0540f0156f58c7ae170f47867e9b88fb59592459..b179f1e3541a29c30487977f5ca45c2acc7291ce 100644 (file)
@@ -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)
@@ -155,8 +155,8 @@ static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
 
 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)