From: David Miller <davem@davemloft.net>
To: srivatsa.bhat@linux.vnet.ibm.com
Cc: paulus@samba.org, oleg@redhat.com, mingo@kernel.org,
rusty@rustcorp.com.au, peterz@infradead.org, tglx@linutronix.de,
akpm@linux-foundation.org, paulmck@linux.vnet.ibm.com,
tj@kernel.org, walken@google.com, ego@linux.vnet.ibm.com,
linux@arm.linux.org.uk, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
sparclinux@vger.kernel.org
Subject: Re: [PATCH v2 13/52] sparc, sysfs: Fix CPU hotplug callback registration
Date: Fri, 14 Feb 2014 13:30:49 -0500 (EST) [thread overview]
Message-ID: <20140214.133049.832801765872021685.davem@davemloft.net> (raw)
In-Reply-To: <20140214075204.22701.72009.stgit@srivatsabhat.in.ibm.com>
From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Date: Fri, 14 Feb 2014 13:22:05 +0530
> Subsystems that want to register CPU hotplug callbacks, as well as perform
> initialization for the CPUs that are already online, often do it as shown
> below:
...
> This is wrong, since it is prone to ABBA deadlocks involving the
> cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
> with CPU hotplug operations).
>
> Instead, the correct and race-free way of performing the callback
> registration is:
...
> Fix the sysfs code in sparc by using this latter form of callback
> registration.
>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: sparclinux@vger.kernel.org
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
next prev parent reply other threads:[~2014-02-14 18:30 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-14 7:49 [PATCH v2 00/52] CPU hotplug: Fix issues with callback registration Srivatsa S. Bhat
2014-02-14 7:49 ` [PATCH v2 01/52] CPU hotplug: Add lockdep annotations to get/put_online_cpus() Srivatsa S. Bhat
2014-02-14 7:49 ` Srivatsa S. Bhat
2014-02-14 7:49 ` [PATCH v2 02/52] CPU hotplug: Provide lockless versions of callback registration functions Srivatsa S. Bhat
2014-02-14 7:49 ` Srivatsa S. Bhat
2014-02-17 13:26 ` Gautham R Shenoy
2014-02-19 21:34 ` Toshi Kani
2014-02-14 7:49 ` [PATCH v2 03/52] Doc/cpu-hotplug: Specify race-free way to register CPU hotplug callbacks Srivatsa S. Bhat
2014-02-14 7:49 ` Srivatsa S. Bhat
2014-02-14 7:49 ` [PATCH v2 04/52] CPU hotplug, perf: Fix CPU hotplug callback registration Srivatsa S. Bhat
2014-02-14 7:49 ` Srivatsa S. Bhat
2014-02-14 7:50 ` [PATCH v2 05/52] ia64, salinfo: Fix " Srivatsa S. Bhat
2014-02-14 7:50 ` Srivatsa S. Bhat
2014-02-14 7:50 ` [PATCH v2 06/52] ia64, palinfo: Fix CPU " Srivatsa S. Bhat
2014-02-14 7:50 ` Srivatsa S. Bhat
2014-02-14 7:50 ` [PATCH v2 07/52] ia64, topology: " Srivatsa S. Bhat
2014-02-14 7:50 ` Srivatsa S. Bhat
2014-02-14 7:50 ` [PATCH v2 08/52] ia64, err-inject: " Srivatsa S. Bhat
2014-02-14 7:50 ` Srivatsa S. Bhat
2014-02-14 7:51 ` [PATCH v2 09/52] arm, hw-breakpoint: " Srivatsa S. Bhat
2014-02-14 7:51 ` Srivatsa S. Bhat
2014-02-14 7:51 ` [PATCH v2 10/52] arm, kvm: " Srivatsa S. Bhat
2014-02-14 7:51 ` Srivatsa S. Bhat
2014-02-14 10:29 ` Paolo Bonzini
2014-02-14 10:29 ` Paolo Bonzini
2014-02-14 7:51 ` [PATCH v2 11/52] s390, cacheinfo: " Srivatsa S. Bhat
2014-02-14 7:51 ` Srivatsa S. Bhat
2014-02-14 7:51 ` [PATCH v2 12/52] s390, smp: " Srivatsa S. Bhat
2014-02-14 7:51 ` Srivatsa S. Bhat
2014-02-14 7:52 ` [PATCH v2 13/52] sparc, sysfs: " Srivatsa S. Bhat
2014-02-14 7:52 ` Srivatsa S. Bhat
2014-02-14 18:30 ` David Miller [this message]
2014-02-14 7:52 ` [PATCH v2 14/52] powerpc, " Srivatsa S. Bhat
2014-02-14 7:52 ` Srivatsa S. Bhat
2014-03-07 2:57 ` Benjamin Herrenschmidt
2014-03-07 2:57 ` Benjamin Herrenschmidt
2014-03-07 6:21 ` Gautham R Shenoy
2014-02-14 7:52 ` [PATCH v2 15/52] x86, msr: " Srivatsa S. Bhat
2014-02-14 7:52 ` Srivatsa S. Bhat
2014-02-14 7:52 ` [PATCH v2 16/52] x86, cpuid: " Srivatsa S. Bhat
2014-02-14 7:52 ` Srivatsa S. Bhat
2014-02-14 7:52 ` [PATCH v2 17/52] x86, vsyscall: " Srivatsa S. Bhat
2014-02-14 7:52 ` Srivatsa S. Bhat
2014-02-14 7:53 ` [PATCH v2 18/52] x86, intel, uncore: " Srivatsa S. Bhat
2014-02-14 7:53 ` Srivatsa S. Bhat
2014-02-14 7:53 ` [PATCH v2 19/52] x86, mce: " Srivatsa S. Bhat
2014-02-14 7:53 ` Srivatsa S. Bhat
2014-02-14 7:53 ` [PATCH v2 20/52] x86, therm_throt.c: " Srivatsa S. Bhat
2014-02-14 7:53 ` Srivatsa S. Bhat
2014-02-14 7:53 ` [PATCH v2 21/52] x86, therm_throt.c: Remove unused therm_cpu_lock Srivatsa S. Bhat
2014-02-14 7:53 ` Srivatsa S. Bhat
2014-02-14 7:54 ` [PATCH v2 22/52] x86, amd, ibs: Fix CPU hotplug callback registration Srivatsa S. Bhat
2014-02-14 7:54 ` Srivatsa S. Bhat
2014-02-14 7:54 ` [PATCH v2 23/52] x86, intel, cacheinfo: " Srivatsa S. Bhat
2014-02-14 7:54 ` Srivatsa S. Bhat
2014-02-14 7:54 ` [PATCH v2 24/52] x86, intel, rapl: " Srivatsa S. Bhat
2014-02-14 7:54 ` Srivatsa S. Bhat
2014-02-14 7:54 ` [PATCH v2 25/52] x86, amd, uncore: " Srivatsa S. Bhat
2014-02-14 7:54 ` Srivatsa S. Bhat
2014-02-14 7:55 ` [PATCH v2 26/52] x86, hpet: " Srivatsa S. Bhat
2014-02-14 7:55 ` Srivatsa S. Bhat
2014-02-14 7:55 ` [PATCH v2 27/52] x86, pci, amd-bus: " Srivatsa S. Bhat
2014-02-14 7:55 ` Srivatsa S. Bhat
2014-02-14 17:35 ` Bjorn Helgaas
2014-02-14 18:03 ` Srivatsa S. Bhat
2014-02-14 18:03 ` Srivatsa S. Bhat
2014-02-14 7:55 ` [PATCH v2 28/52] x86, oprofile, nmi: " Srivatsa S. Bhat
2014-02-14 7:55 ` Srivatsa S. Bhat
2014-02-14 7:55 ` [PATCH v2 29/52] x86, kvm: " Srivatsa S. Bhat
2014-02-14 7:55 ` Srivatsa S. Bhat
2014-02-14 10:29 ` Paolo Bonzini
2014-02-14 7:55 ` [PATCH v2 30/52] arm64, hw_breakpoint.c: " Srivatsa S. Bhat
2014-02-14 7:55 ` Srivatsa S. Bhat
2014-02-14 7:56 ` [PATCH v2 31/52] arm64, debug-monitors: " Srivatsa S. Bhat
2014-02-14 7:56 ` Srivatsa S. Bhat
2014-02-14 7:56 ` [PATCH v2 32/52] powercap, intel-rapl: " Srivatsa S. Bhat
2014-02-14 7:56 ` Srivatsa S. Bhat
2014-02-14 7:56 ` [PATCH v2 33/52] scsi, bnx2i: " Srivatsa S. Bhat
2014-02-14 7:56 ` Srivatsa S. Bhat
2014-02-14 7:56 ` [PATCH v2 34/52] scsi, bnx2fc: " Srivatsa S. Bhat
2014-02-14 7:56 ` Srivatsa S. Bhat
2014-02-14 7:57 ` [PATCH v2 35/52] scsi, fcoe: " Srivatsa S. Bhat
2014-02-14 7:57 ` Srivatsa S. Bhat
2014-02-14 7:57 ` [PATCH v2 36/52] zsmalloc: " Srivatsa S. Bhat
2014-02-14 7:57 ` Srivatsa S. Bhat
2014-02-14 7:57 ` [PATCH v2 37/52] acpi-cpufreq: " Srivatsa S. Bhat
2014-02-14 7:57 ` Srivatsa S. Bhat
2014-02-14 7:57 ` [PATCH v2 38/52] drivers/base/topology.c: " Srivatsa S. Bhat
2014-02-14 7:57 ` Srivatsa S. Bhat
2014-02-15 19:38 ` Greg Kroah-Hartman
2014-02-14 7:58 ` [PATCH v2 39/52] clocksource, dummy-timer: " Srivatsa S. Bhat
2014-02-14 7:58 ` Srivatsa S. Bhat
2014-02-14 7:58 ` [PATCH v2 40/52] intel-idle: " Srivatsa S. Bhat
2014-02-14 7:58 ` Srivatsa S. Bhat
2014-02-14 7:58 ` [PATCH v2 41/52] oprofile, nmi-timer: " Srivatsa S. Bhat
2014-02-14 7:58 ` Srivatsa S. Bhat
2014-02-14 7:58 ` [PATCH v2 42/52] octeon, watchdog: " Srivatsa S. Bhat
2014-02-14 7:58 ` Srivatsa S. Bhat
2014-02-14 7:58 ` [PATCH v2 43/52] thermal, x86-pkg-temp: " Srivatsa S. Bhat
2014-02-14 7:58 ` Srivatsa S. Bhat
2014-02-14 7:59 ` [PATCH v2 44/52] hwmon, coretemp: " Srivatsa S. Bhat
2014-02-14 7:59 ` Srivatsa S. Bhat
2014-02-14 7:59 ` [PATCH v2 45/52] hwmon, via-cputemp: " Srivatsa S. Bhat
2014-02-14 7:59 ` Srivatsa S. Bhat
2014-02-14 7:59 ` [PATCH v2 46/52] xen, balloon: " Srivatsa S. Bhat
2014-02-14 7:59 ` Srivatsa S. Bhat
2014-02-14 16:49 ` Boris Ostrovsky
2014-02-14 16:49 ` Boris Ostrovsky
2014-02-14 16:50 ` Srivatsa S. Bhat
2014-02-15 16:51 ` [UPDATED][PATCH " Srivatsa S. Bhat
2014-02-17 14:50 ` Boris Ostrovsky
2014-02-14 7:59 ` [PATCH v2 47/52] trace, ring-buffer: " Srivatsa S. Bhat
2014-02-14 7:59 ` Srivatsa S. Bhat
2014-02-14 8:00 ` [PATCH v2 48/52] profile: " Srivatsa S. Bhat
2014-02-14 8:00 ` Srivatsa S. Bhat
2014-02-14 8:00 ` [PATCH v2 49/52] mm, vmstat: " Srivatsa S. Bhat
2014-02-14 8:00 ` Srivatsa S. Bhat
2014-02-14 14:26 ` Rik van Riel
2014-02-14 14:26 ` Rik van Riel
2014-02-14 8:00 ` [PATCH v2 50/52] mm, zswap: " Srivatsa S. Bhat
2014-02-14 8:00 ` Srivatsa S. Bhat
2014-02-14 8:00 ` [PATCH v2 51/52] net/core/flow.c: " Srivatsa S. Bhat
2014-02-14 8:00 ` Srivatsa S. Bhat
2014-02-14 18:31 ` David Miller
2014-02-14 8:00 ` [PATCH v2 52/52] net/iucv/iucv.c: " Srivatsa S. Bhat
2014-02-14 8:00 ` Srivatsa S. Bhat
2014-02-14 18:31 ` David Miller
2014-02-18 8:56 ` [PATCH v2 00/52] CPU hotplug: Fix issues with " Srivatsa S. Bhat
2014-02-18 8:56 ` Srivatsa S. Bhat
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