patches/old/devdax-fix-sparse-lock-imbalance-warning.patch

From: Dan Williams <dan.j.williams@intel.com>
Subject: devdax: fix sparse lock imbalance warning
Date: Fri, 14 Oct 2022 16:58:20 -0700

Annotate dax_read_{lock,unlock} with their locking expectations to fix
this sparse report:

drivers/dax/super.c:45:5: sparse: warning: context imbalance in 'dax_read_lock' - wrong count at exit
drivers/dax/super.c: note: in included file (through include/linux/notifier.h, include/linux/memory_hotplug.h, include/linux/mmzone.h, include/linux/gfp.h, include/linux/mm.h, include/linux/pagemap.h):
./include/linux/srcu.h:189:9: sparse: warning: context imbalance in 'dax_read_unlock' - unexpected unlock

Link: https://lkml.kernel.org/r/166579190012.2236710.846739337067413538.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
  Link: http://lore.kernel.org/r/202210091141.cHaQEuCs-lkp@intel.com
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Karol Herbst <kherbst@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/dax/super.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/dax/super.c~devdax-fix-sparse-lock-imbalance-warning
+++ a/drivers/dax/super.c
@@ -42,13 +42,13 @@ static DEFINE_IDA(dax_minor_ida);
 static struct kmem_cache *dax_cache __read_mostly;
 static struct super_block *dax_superblock __read_mostly;
 
-int dax_read_lock(void)
+int dax_read_lock(void) __acquires(&dax_srcu)
 {
 	return srcu_read_lock(&dax_srcu);
 }
 EXPORT_SYMBOL_GPL(dax_read_lock);
 
-void dax_read_unlock(int id)
+void dax_read_unlock(int id) __releases(&dax_srcu)
 {
 	srcu_read_unlock(&dax_srcu, id);
 }
_