linux-kernel - [PATCH 0/5] rpmsg: Cleanup, fixes, and RX path optimization

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Message-ID: <20251217065112.18392-1-zhongqiu.han@oss.qualcomm.com>
Date: Wed, 17 Dec 2025 14:51:07 +0800
From: Zhongqiu Han <zhongqiu.han@....qualcomm.com>
To: andersson@...nel.org, mathieu.poirier@...aro.org, corbet@....net,
        rusty@...tcorp.com.au, ohad@...ery.com
Cc: linux-remoteproc@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        zhongqiu.han@....qualcomm.com
Subject: [PATCH 0/5] rpmsg: Cleanup, fixes, and RX path optimization

This patch series introduces several improvements to the rpmsg subsystem,
including minor cleanups, correctness fixes and a performance optimization
in the virtio transport layer.

Summary:
- Cleanup and API usage improvements (sysfs_emit, comment fixes)
- Documentation corrections
- Proper error handling for dev_set_name()
- Performance optimization in virtio RX path using RCU

The last patch reduces lock contention in a read-heavy hot path by
replacing mutex-based endpoint lookup with RCU-based lookup. This is a
performance optimization only; no functional change.

Zhongqiu Han (5):
  rpmsg: Replace sprintf() with sysfs_emit() in sysfs show
  rpmsg: core: Fix incorrect return value documentation
  rpmsg: char: Fix typo in comment
  rpmsg: Handle dev_set_name() failures properly
  rpmsg: virtio: Optimize endpoint lookup in RX path with RCU

 Documentation/staging/rpmsg.rst  |  1 -
 drivers/rpmsg/qcom_glink_smem.c  |  8 +++++++-
 drivers/rpmsg/qcom_smd.c         | 10 ++++++++--
 drivers/rpmsg/rpmsg_char.c       | 13 ++++++++-----
 drivers/rpmsg/rpmsg_core.c       | 14 ++++++++------
 drivers/rpmsg/rpmsg_ctrl.c       |  5 ++++-
 drivers/rpmsg/virtio_rpmsg_bus.c | 11 +++++++++--
 7 files changed, 44 insertions(+), 18 deletions(-)


base-commit: 563c8dd425b59e44470e28519107b1efc99f4c7b
-- 
2.43.0