linux-kernel - [PATCH 2/3] cpu/hotplug: Remove disable_nonboot

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200409112742.3581-2-qais.yousef@arm.com>
Date:   Thu,  9 Apr 2020 12:27:41 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Qais Yousef <qais.yousef@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Todd E Brandt <todd.e.brandt@...ux.intel.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] cpu/hotplug: Remove disable_nonboot_cpus()

The single user could have called freeze_secondary_cpus() directly.

Since this function was a source of confusion, remove it as it's
just a pointless wrapper.

Signed-off-by: Qais Yousef <qais.yousef@....com>
CC: "Rafael J. Wysocki" <rjw@...ysocki.net>
CC: Len Brown <len.brown@...el.com>
CC: Pavel Machek <pavel@....cz>
CC: Ingo Molnar <mingo@...hat.com>
CC: Borislav Petkov <bp@...en8.de>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: x86@...nel.org
CC: Todd E Brandt <todd.e.brandt@...ux.intel.com>
CC: linux-pm@...r.kernel.org
CC: linux-kernel@...r.kernel.org
---
 Documentation/power/suspend-and-cpuhotplug.rst | 4 ++--
 arch/x86/power/cpu.c                           | 2 +-
 include/linux/cpu.h                            | 5 -----
 kernel/cpu.c                                   | 2 +-
 4 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/Documentation/power/suspend-and-cpuhotplug.rst b/Documentation/power/suspend-and-cpuhotplug.rst
index 572d968c5375..79f7610a6f6f 100644
--- a/Documentation/power/suspend-and-cpuhotplug.rst
+++ b/Documentation/power/suspend-and-cpuhotplug.rst
@@ -48,7 +48,7 @@ More details follow::
                                         |
                                         |
                                         v
-                              disable_nonboot_cpus()
+                              freeze_secondary_cpus()
                                    /* start */
                                         |
                                         v
@@ -83,7 +83,7 @@ More details follow::
                             Release cpu_add_remove_lock
                                         |
                                         v
-                       /* disable_nonboot_cpus() complete */
+                       /* freeze_secondary_cpus() complete */
                                         |
                                         v
                                    Do suspend
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 915bb1639763..e0a9ad8829b0 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -307,7 +307,7 @@ int hibernate_resume_nonboot_cpu_disable(void)
 	if (ret)
 		return ret;
 	smp_ops.play_dead = resume_play_dead;
-	ret = disable_nonboot_cpus();
+	ret = freeze_secondary_cpus(0);
 	smp_ops.play_dead = play_dead;
 	return ret;
 }
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 9ead281157d3..a00941c7828b 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -145,10 +145,6 @@ static inline void put_online_cpus(void) { cpus_read_unlock(); }
 
 #ifdef CONFIG_PM_SLEEP_SMP
 extern int freeze_secondary_cpus(int primary);
-static inline int disable_nonboot_cpus(void)
-{
-	return freeze_secondary_cpus(0);
-}
 extern void enable_nonboot_cpus(void);
 
 static inline int suspend_disable_secondary_cpus(void)
@@ -166,7 +162,6 @@ static inline void suspend_enable_secondary_cpus(void)
 }
 
 #else /* !CONFIG_PM_SLEEP_SMP */
-static inline int disable_nonboot_cpus(void) { return 0; }
 static inline void enable_nonboot_cpus(void) {}
 static inline int suspend_disable_secondary_cpus(void) { return 0; }
 static inline void suspend_enable_secondary_cpus(void) { }
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 30848496cbc7..d6d2c829561e 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1376,7 +1376,7 @@ int freeze_secondary_cpus(int primary)
 
 	/*
 	 * Make sure the CPUs won't be enabled by someone else. We need to do
-	 * this even in case of failure as all disable_nonboot_cpus() users are
+	 * this even in case of failure as all freeze_secondary_cpus() users are
 	 * supposed to do enable_nonboot_cpus() on the failure path.
 	 */
 	cpu_hotplug_disabled++;
-- 
2.17.1