/* * Scheduler code and data structures related to cpufreq. * * Copyright (C) 2016, Intel Corporation * Author: Rafael J. Wysocki * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include "sched.h" DEFINE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); /** * cpufreq_add_update_util_hook - Populate the CPU's update_util_data pointer. * @cpu: The CPU to set the pointer for. * @data: New pointer value. * @func: Callback function to set for the CPU. * * Set and publish the update_util_data pointer for the given CPU. * * The update_util_data pointer of @cpu is set to @data and the callback * function pointer in the target struct update_util_data is set to @func. * That function will be called by cpufreq_update_util() from RCU-sched * read-side critical sections, so it must not sleep. @data will always be * passed to it as the first argument which allows the function to get to the * target update_util_data structure and its container. * * The update_util_data pointer of @cpu must be NULL when this function is * called or it will WARN() and return with no effect. */ void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data, void (*func)(struct update_util_data *data, u64 time, unsigned int flags)) { if (WARN_ON(!data || !func)) return; if (WARN_ON(per_cpu(cpufreq_update_util_data, cpu))) return; data->func = func; rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), data); } EXPORT_SYMBOL_GPL(cpufreq_add_update_util_hook); /** * cpufreq_remove_update_util_hook - Clear the CPU's update_util_data pointer. * @cpu: The CPU to clear the pointer for. * * Clear the update_util_data pointer for the given CPU. * * Callers must use RCU-sched callbacks to free any memory that might be * accessed via the old update_util_data pointer or invoke synchronize_sched() * right after this function to avoid use-after-free. */ void cpufreq_remove_update_util_hook(int cpu) { rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), NULL); } EXPORT_SYMBOL_GPL(cpufreq_remove_update_util_hook); 0552fe508c'>commitdiff
path: root/include/dt-bindings/thermal/tegra124-soctherm.h
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /include/dt-bindings/thermal/tegra124-soctherm.h
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/dt-bindings/thermal/tegra124-soctherm.h')