From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- samples/rpmsg/Makefile | 2 + samples/rpmsg/rpmsg_client_sample.c | 96 +++++++++++++++++++++++++++++++++++++ 2 files changed, 98 insertions(+) create mode 100644 samples/rpmsg/Makefile create mode 100644 samples/rpmsg/rpmsg_client_sample.c (limited to 'samples/rpmsg') diff --git a/samples/rpmsg/Makefile b/samples/rpmsg/Makefile new file mode 100644 index 000000000..ddf9a5d13 --- /dev/null +++ b/samples/rpmsg/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SAMPLE_RPMSG_CLIENT) += rpmsg_client_sample.o diff --git a/samples/rpmsg/rpmsg_client_sample.c b/samples/rpmsg/rpmsg_client_sample.c new file mode 100644 index 000000000..ae5081662 --- /dev/null +++ b/samples/rpmsg/rpmsg_client_sample.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Remote processor messaging - sample client driver + * + * Copyright (C) 2011 Texas Instruments, Inc. + * Copyright (C) 2011 Google, Inc. + * + * Ohad Ben-Cohen + * Brian Swetland + */ + +#include +#include +#include + +#define MSG "hello world!" + +static int count = 100; +module_param(count, int, 0644); + +struct instance_data { + int rx_count; +}; + +static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len, + void *priv, u32 src) +{ + int ret; + struct instance_data *idata = dev_get_drvdata(&rpdev->dev); + + dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", + ++idata->rx_count, src); + + print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len, + true); + + /* samples should not live forever */ + if (idata->rx_count >= count) { + dev_info(&rpdev->dev, "goodbye!\n"); + return 0; + } + + /* send a new message now */ + ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); + if (ret) + dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); + + return 0; +} + +static int rpmsg_sample_probe(struct rpmsg_device *rpdev) +{ + int ret; + struct instance_data *idata; + + dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", + rpdev->src, rpdev->dst); + + idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL); + if (!idata) + return -ENOMEM; + + dev_set_drvdata(&rpdev->dev, idata); + + /* send a message to our remote processor */ + ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); + if (ret) { + dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); + return ret; + } + + return 0; +} + +static void rpmsg_sample_remove(struct rpmsg_device *rpdev) +{ + dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n"); +} + +static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = { + { .name = "rpmsg-client-sample" }, + { }, +}; +MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table); + +static struct rpmsg_driver rpmsg_sample_client = { + .drv.name = KBUILD_MODNAME, + .id_table = rpmsg_driver_sample_id_table, + .probe = rpmsg_sample_probe, + .callback = rpmsg_sample_cb, + .remove = rpmsg_sample_remove, +}; +module_rpmsg_driver(rpmsg_sample_client); + +MODULE_DESCRIPTION("Remote processor messaging sample client driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1