From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>, Julia Cartwright <julia@ni.com>,
Daniel Wagner <wagi@monom.org>, Tom Zanussi <zanussi@kernel.org>
Subject: [PATCH RT 07/32] x86: preempt: Check preemption level before looking at lazy-preempt
Date: Fri, 17 Jan 2020 12:41:18 -0500 [thread overview]
Message-ID: <20200117174128.359879963@goodmis.org> (raw)
In-Reply-To: 20200117174111.282847363@goodmis.org
4.19.94-rt39-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ Upstream commit 19fc8557f2323c52b26561651ed4d51fc688a740 ]
Before evaluating the lazy-preempt state it must be ensure that the
preempt-count is zero.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
arch/x86/include/asm/preempt.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
index f66708779274..afa0e42ccdd1 100644
--- a/arch/x86/include/asm/preempt.h
+++ b/arch/x86/include/asm/preempt.h
@@ -96,6 +96,8 @@ static __always_inline bool __preempt_count_dec_and_test(void)
if (____preempt_count_dec_and_test())
return true;
#ifdef CONFIG_PREEMPT_LAZY
+ if (preempt_count())
+ return false;
if (current_thread_info()->preempt_lazy_count)
return false;
return test_thread_flag(TIF_NEED_RESCHED_LAZY);
--
2.24.1
next prev parent reply other threads:[~2020-01-17 17:43 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 17:41 [PATCH RT 00/32] Linux 4.19.94-rt39-rc1 Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 01/32] i2c: exynos5: Remove IRQF_ONESHOT Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 02/32] i2c: hix5hd2: " Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 03/32] sched/deadline: Ensure inactive_timer runs in hardirq context Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 04/32] thermal/x86_pkg_temp: make pkg_temp_lock a raw spinlock Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 05/32] dma-buf: Use seqlock_t instread disabling preemption Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 06/32] KVM: arm/arm64: Let the timer expire in hardirq context on RT Steven Rostedt
2020-01-17 17:41 ` Steven Rostedt [this message]
2020-01-17 17:41 ` [PATCH RT 08/32] hrtimer: Use READ_ONCE to access timer->base in hrimer_grab_expiry_lock() Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 09/32] hrtimer: Dont grab the expiry lock for non-soft hrtimer Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 10/32] hrtimer: Prevent using hrtimer_grab_expiry_lock() on migration_base Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 11/32] hrtimer: Add a missing bracket and hide `migration_base on !SMP Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 12/32] posix-timers: Unlock expiry lock in the early return Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 14/32] sched: __set_cpus_allowed_ptr: Check cpus_mask, not cpus_ptr Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 15/32] sched: Remove dead __migrate_disabled() check Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 16/32] sched: migrate disable: Protect cpus_ptr with lock Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 17/32] lib/smp_processor_id: Dont use cpumask_equal() Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 18/32] futex: Make the futex_hash_bucket spinlock_t again and bring back its old state Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 19/32] locking/rtmutex: Clean ->pi_blocked_on in the error case Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 20/32] lib/ubsan: Dont seralize UBSAN report Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 21/32] kmemleak: Change the lock of kmemleak_object to raw_spinlock_t Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 22/32] sched: migrate_enable: Use select_fallback_rq() Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 23/32] sched: Lazy migrate_disable processing Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 24/32] sched: migrate_enable: Use stop_one_cpu_nowait() Steven Rostedt
2020-01-22 8:31 ` Sebastian Andrzej Siewior
2020-01-22 11:33 ` Steven Rostedt
2020-01-22 18:39 ` Scott Wood
2020-01-22 19:07 ` Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 25/32] Revert "cpufreq: drop K8s driver from beeing selected" Steven Rostedt
2020-01-22 8:38 ` Sebastian Andrzej Siewior
2020-01-22 11:34 ` Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 26/32] Revert "ARM: Initialize split page table locks for vector page" Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 28/32] locking: Make spinlock_t and rwlock_t a RCU section on RT Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 29/32] sched/core: migrate_enable() must access takedown_cpu_task on !HOTPLUG_CPU Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 30/32] lib/smp_processor_id: Adjust check_preemption_disabled() Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 31/32] sched: migrate_enable: Busy loop until the migration request is completed Steven Rostedt
2020-01-17 17:41 ` [PATCH RT 32/32] Linux 4.19.94-rt39-rc1 Steven Rostedt
[not found] ` <20200117174131.455165326@goodmis.org>
2020-01-22 8:43 ` [PATCH RT 27/32] x86/fpu: Dont cache access to fpu_fpregs_owner_ctx Sebastian Andrzej Siewior
2020-01-22 11:34 ` Steven Rostedt
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