From: Qais Yousef <qais.yousef@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org, Qais Yousef <qais.yousef@arm.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org
Subject: [PATCH v4 09/17] x86: Replace cpu_up/down with add/remove_cpu
Date: Mon, 23 Mar 2020 13:51:02 +0000 [thread overview]
Message-ID: <20200323135110.30522-10-qais.yousef@arm.com> (raw)
In-Reply-To: <20200323135110.30522-1-qais.yousef@arm.com>
The core device API performs extra housekeeping bits that are missing
from directly calling cpu_up/down.
See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
serialization during LPM") for an example description of what might go
wrong.
This also prepares to make cpu_up/down a private interface for anything
but the cpu subsystem.
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: Borislav Petkov <bp@alien8.de>
CC: "H. Peter Anvin" <hpa@zytor.com>
CC: x86@kernel.org
CC: linux-kernel@vger.kernel.org
---
arch/x86/kernel/topology.c | 22 ++++++----------------
arch/x86/mm/mmio-mod.c | 4 ++--
arch/x86/xen/smp.c | 2 +-
3 files changed, 9 insertions(+), 19 deletions(-)
diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c
index be5bc2e47c71..b8810ebbc8ae 100644
--- a/arch/x86/kernel/topology.c
+++ b/arch/x86/kernel/topology.c
@@ -59,39 +59,29 @@ __setup("cpu0_hotplug", enable_cpu0_hotplug);
*/
int _debug_hotplug_cpu(int cpu, int action)
{
- struct device *dev = get_cpu_device(cpu);
int ret;
if (!cpu_is_hotpluggable(cpu))
return -EINVAL;
- lock_device_hotplug();
-
switch (action) {
case 0:
- ret = cpu_down(cpu);
- if (!ret) {
+ ret = remove_cpu(cpu);
+ if (!ret)
pr_info("DEBUG_HOTPLUG_CPU0: CPU %u is now offline\n", cpu);
- dev->offline = true;
- kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
- } else
+ else
pr_debug("Can't offline CPU%d.\n", cpu);
break;
case 1:
- ret = cpu_up(cpu);
- if (!ret) {
- dev->offline = false;
- kobject_uevent(&dev->kobj, KOBJ_ONLINE);
- } else {
+ ret = add_cpu(cpu);
+ if (ret)
pr_debug("Can't online CPU%d.\n", cpu);
- }
+
break;
default:
ret = -EINVAL;
}
- unlock_device_hotplug();
-
return ret;
}
diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
index 673de6063345..109325d77b3e 100644
--- a/arch/x86/mm/mmio-mod.c
+++ b/arch/x86/mm/mmio-mod.c
@@ -386,7 +386,7 @@ static void enter_uniprocessor(void)
put_online_cpus();
for_each_cpu(cpu, downed_cpus) {
- err = cpu_down(cpu);
+ err = remove_cpu(cpu);
if (!err)
pr_info("CPU%d is down.\n", cpu);
else
@@ -406,7 +406,7 @@ static void leave_uniprocessor(void)
return;
pr_notice("Re-enabling CPUs...\n");
for_each_cpu(cpu, downed_cpus) {
- err = cpu_up(cpu);
+ err = add_cpu(cpu);
if (!err)
pr_info("enabled CPU%d.\n", cpu);
else
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 7a43b2ae19f1..2097fa0ebdb5 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -132,7 +132,7 @@ void __init xen_smp_cpus_done(unsigned int max_cpus)
if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
continue;
- rc = cpu_down(cpu);
+ rc = remove_cpu(cpu);
if (rc == 0) {
/*
--
2.17.1
next prev parent reply other threads:[~2020-03-23 13:52 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 13:50 [PATCH v4 00/17] Convert cpu_up/down to device_online/offline Qais Yousef
2020-03-23 13:50 ` [PATCH v4 01/17] cpu: Add new {add,remove}_cpu() functions Qais Yousef
2020-03-23 15:00 ` Paul E. McKenney
2020-03-25 12:06 ` [tip: smp/core] cpu/hotplug: " tip-bot2 for Qais Yousef
2020-03-23 13:50 ` [PATCH v4 02/17] smp: Create a new function to shutdown nonboot cpus Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] cpu/hotplug: " tip-bot2 for Qais Yousef
2020-03-23 13:50 ` [PATCH v4 03/17] ia64: Replace cpu_down with smp_shutdown_nonboot_cpus() Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] ia64: Replace cpu_down() " tip-bot2 for Qais Yousef
2020-03-23 13:50 ` [PATCH v4 04/17] arm: Don't use disable_nonboot_cpus() Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] ARM: " tip-bot2 for Qais Yousef
2020-03-23 13:50 ` [PATCH v4 05/17] arm: Use reboot_cpu instead of hardcoding it to 0 Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] ARM: " tip-bot2 for Qais Yousef
2020-03-23 13:50 ` [PATCH v4 06/17] arm64: Don't use disable_nonboot_cpus() Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] " tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 07/17] arm64: Use reboot_cpu instead of hardconding it to 0 Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] " tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 08/17] arm64: hibernate.c: Create a new function to handle cpu_up(sleep_cpu) Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] arm64: hibernate: Use bringup_hibernate_cpu() tip-bot2 for Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] cpu/hotplug: Provide bringup_hibernate_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` Qais Yousef [this message]
2020-03-25 12:06 ` [tip: smp/core] x86/smp: Replace cpu_up/down() with add/remove_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 10/17] powerpc: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] powerpc: Replace cpu_up/down() with add/remove_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 11/17] sparc: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] sparc: Replace cpu_up/down() with add/remove_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 12/17] parisc: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] parisc: Replace cpu_up/down() with add/remove_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 13/17] driver: xen: Replace cpu_up/down with device_online/offline Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] xen/cpuhotplug: Replace cpu_up/down() with device_online/offline() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 14/17] firmware: psci: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] firmware: psci: Replace cpu_up/down() with add/remove_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 15/17] torture: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] torture: Replace cpu_up/down() with add/remove_cpu() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 16/17] smp: Create a new function to bringup nonboot cpus online Qais Yousef
2020-03-25 12:06 ` [tip: smp/core] cpu/hotplug: Move bringup of secondary CPUs out of smp_init() tip-bot2 for Qais Yousef
2020-03-23 13:51 ` [PATCH v4 17/17] cpu: Hide cpu_up/down Qais Yousef
2020-03-25 12:05 ` [tip: smp/core] cpu/hotplug: Hide cpu_up/down() tip-bot2 for Qais Yousef
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