linux-kernel - [PATCH v3 0/4] dax/bus.c: Fixups for dax-bus locking

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Date: Tue, 30 Apr 2024 11:44:22 -0600
From: Vishal Verma <vishal.l.verma@...el.com>
To: Dan Williams <dan.j.williams@...el.com>, 
 Dave Jiang <dave.jiang@...el.com>, 
 Alison Schofield <alison.schofield@...el.com>, 
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, nvdimm@...ts.linux.dev, linux-cxl@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Vishal Verma <vishal.l.verma@...el.com>
Subject: [PATCH v3 0/4] dax/bus.c: Fixups for dax-bus locking

Commit Fixes: c05ae9d85b47 ("dax/bus.c: replace driver-core lock usage by a local rwsem")
introduced a few problems that this series aims to fix. Add back
device_lock() where it was correctly used (during device manipulation
operations), remove conditional locking in unregister_dax_dev() and
unregister_dax_mapping(), use non-interruptible versions of rwsem
locks when not called from a user process, and fix up a write vs.
read usage of an rwsem.

Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
---
Changes in v3:
- Rebase to v6.9-rc6
- Collect review tags (Dan)
- Reword commit message for patch 2 (Dan)
- Use plain down_write() in delete_store() (Dan)
- Link to v2: https://lore.kernel.org/r/20240416-vv-dax_abi_fixes-v2-0-d5f0c8ec162e@intel.com

Changes in v2:
- Add back valid device_lock uses (Dan)
- Remove conditional locking (Dan)
- Use non-interruptible versions of rwsem locks when not called from a
  user process (Dan)
- Fix up a write vs. read usage of an rwsem
- Link to v1: https://lore.kernel.org/r/20240402-vv-dax_abi_fixes-v1-1-c3e0fdbafba5@intel.com

---
Vishal Verma (4):
      dax/bus.c: replace WARN_ON_ONCE() with lockdep asserts
      dax/bus.c: fix locking for unregister_dax_dev / unregister_dax_mapping paths
      dax/bus.c: Don't use down_write_killable for non-user processes
      dax/bus.c: Use the right locking mode (read vs write) in size_show

 drivers/dax/bus.c | 66 +++++++++++++++----------------------------------------
 1 file changed, 18 insertions(+), 48 deletions(-)
---
base-commit: e67572cd2204894179d89bd7b984072f19313b03
change-id: 20240402-vv-dax_abi_fixes-8af3b6ff2e5a

Best regards,
-- 
Vishal Verma <vishal.l.verma@...el.com>