From: Qais Yousef <qais.yousef@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Qais Yousef <qais.yousef@arm.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Nicholas Piggin <npiggin@gmail.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Jiri Kosina <jkosina@suse.cz>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Eiichi Tsukata <devel@etsukata.com>,
Zhenzhong Duan <zhenzhong.duan@oracle.com>,
Ingo Molnar <mingo@kernel.org>,
Pavankumar Kondeti <pkondeti@codeaurora.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 12/12] cpu: Hide cpu_up/down
Date: Wed, 30 Oct 2019 15:38:37 +0000 [thread overview]
Message-ID: <20191030153837.18107-13-qais.yousef@arm.com> (raw)
In-Reply-To: <20191030153837.18107-1-qais.yousef@arm.com>
Provide a special exported function for the device core to bring a cpu
up/down and hide the real cpu_up/down as they are treated as private
functions. cpu_up/down are lower level API and users outside the cpu
subsystem should use device_online/offline which will take care of extra
housekeeping work like keeping sysfs in sync.
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: "Rafael J. Wysocki" <rafael@kernel.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Josh Poimboeuf <jpoimboe@redhat.com>
CC: Nicholas Piggin <npiggin@gmail.com>
CC: "Peter Zijlstra (Intel)" <peterz@infradead.org>
CC: Jiri Kosina <jkosina@suse.cz>
CC: Daniel Lezcano <daniel.lezcano@linaro.org>
CC: Eiichi Tsukata <devel@etsukata.com>
CC: Zhenzhong Duan <zhenzhong.duan@oracle.com>
CC: Ingo Molnar <mingo@kernel.org>
CC: Pavankumar Kondeti <pkondeti@codeaurora.org>
CC: linux-kernel@vger.kernel.org
---
drivers/base/cpu.c | 4 ++--
include/linux/cpu.h | 4 ++--
kernel/cpu.c | 26 ++++++++++++++++++++++----
3 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index cc37511de866..96c69c5fbfff 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -55,7 +55,7 @@ static int cpu_subsys_online(struct device *dev)
if (from_nid == NUMA_NO_NODE)
return -ENODEV;
- ret = cpu_up(cpuid);
+ ret = cpu_subsys_up(dev);
/*
* When hot adding memory to memoryless node and enabling a cpu
* on the node, node number of the cpu may internally change.
@@ -69,7 +69,7 @@ static int cpu_subsys_online(struct device *dev)
static int cpu_subsys_offline(struct device *dev)
{
- return cpu_down(dev->id);
+ return cpu_subsys_down(dev);
}
void unregister_cpu(struct cpu *cpu)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index b1c7b788b8e9..6822e676f420 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -83,7 +83,7 @@ extern ssize_t arch_cpu_release(const char *, size_t);
#ifdef CONFIG_SMP
extern bool cpuhp_tasks_frozen;
-int cpu_up(unsigned int cpu);
+int cpu_subsys_up(struct device *dev);
void notify_cpu_starting(unsigned int cpu);
extern void cpu_maps_update_begin(void);
extern void cpu_maps_update_done(void);
@@ -114,7 +114,7 @@ extern void lockdep_assert_cpus_held(void);
extern void cpu_hotplug_disable(void);
extern void cpu_hotplug_enable(void);
void clear_tasks_mm_cpumask(int cpu);
-int cpu_down(unsigned int cpu);
+int cpu_subsys_down(struct device *dev);
#else /* CONFIG_HOTPLUG_CPU */
diff --git a/kernel/cpu.c b/kernel/cpu.c
index e16695b841de..087c10dbfb99 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1045,11 +1045,20 @@ static int do_cpu_down(unsigned int cpu, enum cpuhp_state target)
return err;
}
-int cpu_down(unsigned int cpu)
+static int cpu_down(unsigned int cpu)
{
return do_cpu_down(cpu, CPUHP_OFFLINE);
}
-EXPORT_SYMBOL(cpu_down);
+
+/*
+ * This function is meant to be used by device core cpu subsystem.
+ *
+ * Other subsystems should use device_offline(get_cpu_device(cpu)) instead.
+ */
+int cpu_subsys_down(struct device *dev)
+{
+ return cpu_down(dev->id);
+}
#else
#define takedown_cpu NULL
@@ -1191,11 +1200,20 @@ static int do_cpu_up(unsigned int cpu, enum cpuhp_state target)
return err;
}
-int cpu_up(unsigned int cpu)
+static int cpu_up(unsigned int cpu)
{
return do_cpu_up(cpu, CPUHP_ONLINE);
}
-EXPORT_SYMBOL_GPL(cpu_up);
+
+/*
+ * This function is meant to be used by device core cpu subsystem.
+ *
+ * Other subsystems should use device_online(get_cpu_device(cpu)) instead.
+ */
+int cpu_subsys_up(struct device *dev)
+{
+ return cpu_up(dev->id);
+}
int hibernation_bringup_sleep_cpu(unsigned int sleep_cpu)
{
--
2.17.1
next prev parent reply other threads:[~2019-10-30 15:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191030153837.18107-1-qais.yousef@arm.com>
2019-10-30 15:38 ` [PATCH 01/12] arm64: hibernate.c: create a new function to handle cpu_up(sleep_cpu) Qais Yousef
2019-11-19 22:31 ` Thomas Gleixner
2019-11-19 22:51 ` Qais Yousef
2019-11-19 23:01 ` Thomas Gleixner
2019-11-19 23:21 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 02/12] x86: Replace cpu_up/down with devcie_online/offline Qais Yousef
2019-10-30 15:38 ` [PATCH 03/12] powerpc: Replace cpu_up/down with device_online/offline Qais Yousef
2019-11-19 1:19 ` Michael Ellerman
2019-11-19 9:47 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 04/12] ia64: Replace cpu_down with freeze_secondary_cpus Qais Yousef
2019-11-02 4:59 ` kbuild test robot
2019-11-19 22:21 ` Thomas Gleixner
2019-11-19 22:32 ` Qais Yousef
2019-11-19 22:59 ` Thomas Gleixner
2019-11-19 23:19 ` Qais Yousef
2019-11-20 8:46 ` Thomas Gleixner
2019-11-20 10:49 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 05/12] sparc: Replace cpu_up/down with device_online/offline Qais Yousef
2019-10-30 19:33 ` David Miller
2019-10-30 15:38 ` [PATCH 06/12] parisc: " Qais Yousef
2019-11-20 11:09 ` Qais Yousef
2019-11-22 19:51 ` Helge Deller
2019-11-24 10:20 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 07/12] driver: base: cpu: export device_online/offline Qais Yousef
2019-11-02 17:17 ` Greg Kroah-Hartman
2019-10-30 15:38 ` [PATCH 08/12] driver: xen: Replace cpu_up/down with device_online/offline Qais Yousef
2019-10-30 15:38 ` [PATCH 09/12] firmware: psci: " Qais Yousef
2019-10-30 15:38 ` [PATCH 10/12] torture: " Qais Yousef
2019-10-30 15:38 ` [PATCH 11/12] smp: Create a new function to bringup nonboot cpus online Qais Yousef
2019-11-19 22:42 ` Thomas Gleixner
2019-10-30 15:38 ` Qais Yousef [this message]
2019-11-19 22:25 ` [PATCH 12/12] cpu: Hide cpu_up/down Thomas Gleixner
2019-11-19 22:36 ` Qais Yousef
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