From: Borislav Petkov <bp@alien8.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Sebastian Siewior <bigeasy@linutronix.de>,
x86@kernel.org
Subject: Re: [patch 16/20] perf/x86/intel: Drop get_online_cpus() in intel_snb_check_microcode()
Date: Tue, 18 Apr 2017 13:27:51 +0200 [thread overview]
Message-ID: <20170418112751.kwuiplly3assmo3j@pd.tnic> (raw)
In-Reply-To: <20170415171652.582131508@linutronix.de>
On Sat, Apr 15, 2017 at 07:01:23PM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>
> If intel_snb_check_microcode() is invoked via
> microcode_init -> perf_check_microcode -> intel_snb_check_microcode
>
> then get_online_cpus() is invoked nested. This works with the current
> implementation of get_online_cpus() but prevents converting it to a percpu
> rwsem.
>
> intel_snb_check_microcode() is also invoked from intel_sandybridge_quirk()
> unprotected.
>
> Drop get_online_cpus() from intel_snb_check_microcode() and add it to
> intel_sandybridge_quirk() so both call sites are protected.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: x86@kernel.org
Acked-by: Borislav Petkov <bp@suse.de>
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2017-04-18 11:28 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-15 17:01 [patch 00/20] cpu/hotplug: Convert get_online_cpus() to a percpu_rwsem Thomas Gleixner
2017-04-15 17:01 ` [patch 01/20] cpu/hotplug: Provide cpuhp_setup/remove_state[_nocalls]_locked() Thomas Gleixner
2017-04-15 17:01 ` [patch 02/20] stop_machine: Provide stop_machine_locked() Thomas Gleixner
2017-04-15 17:01 ` [patch 03/20] padata: Make padata_alloc() static Thomas Gleixner
2017-04-16 6:22 ` Jason A. Donenfeld
2017-04-17 9:14 ` Thomas Gleixner
2017-04-15 17:01 ` [patch 04/20] padata: Avoid nested calls to get_online_cpus() in pcrypt_init_padata() Thomas Gleixner
2017-04-15 17:01 ` [patch 05/20] x86/mtrr: Remove get_online_cpus() from mtrr_save_state() Thomas Gleixner
2017-04-15 17:01 ` [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked() Thomas Gleixner
2017-04-15 22:54 ` Rafael J. Wysocki
2017-04-17 4:14 ` Viresh Kumar
2017-04-15 17:01 ` [patch 07/20] KVM/PPC/Book3S HV: " Thomas Gleixner
2017-04-15 17:01 ` [patch 08/20] hwtracing/coresight-etm3x: Use the locked version of cpuhp_setup_state_nocalls() Thomas Gleixner
2017-04-15 17:01 ` [patch 09/20] hwtracing/coresight-etm4x: Use cpuhp_setup_state_nocalls_locked() Thomas Gleixner
2017-04-15 17:01 ` [patch 10/20] perf/x86/intel/cqm: Use cpuhp_setup_state_locked() Thomas Gleixner
2017-04-15 17:01 ` [patch 11/20] ARM/hw_breakpoint: " Thomas Gleixner
2017-04-15 17:01 ` [patch 12/20] s390/kernel: Use stop_machine_locked() Thomas Gleixner
2017-04-15 17:01 ` [patch 13/20] powerpc/powernv: " Thomas Gleixner
2017-04-15 17:01 ` [patch 14/20] kernel/hotplug: Use stop_machine_locked() in takedown_cpu() Thomas Gleixner
2017-04-15 17:01 ` [patch 15/20] x86/perf: Drop EXPORT of perf_check_microcode Thomas Gleixner
2017-04-18 11:24 ` Borislav Petkov
2017-04-15 17:01 ` [patch 16/20] perf/x86/intel: Drop get_online_cpus() in intel_snb_check_microcode() Thomas Gleixner
2017-04-18 11:27 ` Borislav Petkov [this message]
2017-04-15 17:01 ` [patch 17/20] PCI: Use cpu_hotplug_disable() instead of get_online_cpus() Thomas Gleixner
2017-04-17 6:46 ` Peter Zijlstra
2017-04-17 7:40 ` Thomas Gleixner
2017-04-18 19:44 ` Bjorn Helgaas
2017-04-18 19:51 ` Thomas Gleixner
2017-04-15 17:01 ` [patch 18/20] PCI: Replace the racy recursion prevention Thomas Gleixner
2017-04-15 17:01 ` [patch 19/20] ACPI/processor: Use cpu_hotplug_disable() instead of get_online_cpus() Thomas Gleixner
2017-04-16 22:53 ` Rafael J. Wysocki
2017-04-15 17:01 ` [patch 20/20] cpu/hotplug: Convert hotplug locking to percpu rwsem Thomas Gleixner
2017-04-17 6:50 ` Peter Zijlstra
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