From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: linux-arm-kernel@lists.infradead.org Cc: Frank Rowand <frank.rowand@am.sony.com>, David Brown <davidb@codeaurora.org>, Daniel Walker <dwalker@fifo99.com>, Bryan Huntsman <bryanh@codeaurora.org>, linux-arm-msm@vger.kernel.org, Frank Rowand <frank.rowand@sonymobile.com>, Thomas Gleixner <tglx@linutronix.de>, Sebastian Andrzej Siewior <bigeasy@linutronix.de> Subject: [PATCH 2/8] ARM: Convert boot_lock to raw_lock [msm] Date: Fri, 20 Dec 2013 10:47:40 +0100 [thread overview] Message-ID: <1387532866-22601-3-git-send-email-bigeasy@linutronix.de> (raw) In-Reply-To: <1387532866-22601-1-git-send-email-bigeasy@linutronix.de> From: Frank Rowand <frank.rowand@am.sony.com> The arm boot_lock is used by the secondary processor startup code. The locking task is the idle thread, which has idle->sched_class == &idle_sched_class. idle_sched_class->enqueue_task == NULL, so if the idle task blocks on the lock, the attempt to wake it when the lock becomes available will fail: try_to_wake_up() ... activate_task() enqueue_task() p->sched_class->enqueue_task(rq, p, flags) Fix by converting boot_lock to a raw spin lock. Cc: David Brown <davidb@codeaurora.org> Cc: Daniel Walker <dwalker@fifo99.com> Cc: Bryan Huntsman <bryanh@codeaurora.org> Cc: linux-arm-msm@vger.kernel.org Cc: Frank Rowand <frank.rowand@sonymobile.com> Signed-off-by: Frank Rowand <frank.rowand@am.sony.com> Link: http://lkml.kernel.org/r/4E77B952.3010606@am.sony.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- arch/arm/mach-msm/platsmp.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c index 3f06edc..fc09a04 100644 --- a/arch/arm/mach-msm/platsmp.c +++ b/arch/arm/mach-msm/platsmp.c @@ -30,7 +30,7 @@ extern void msm_secondary_startup(void); -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static inline int get_core_count(void) { @@ -50,8 +50,8 @@ static void msm_secondary_init(unsigned int cpu) /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static void prepare_cold_cpu(unsigned int cpu) @@ -88,7 +88,7 @@ static int msm_boot_secondary(unsigned int cpu, struct task_struct *idle) * set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * The secondary processor is waiting to be released from @@ -122,7 +122,7 @@ static int msm_boot_secondary(unsigned int cpu, struct task_struct *idle) * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? -ENOSYS : 0; } -- 1.8.5.1
WARNING: multiple messages have this Message-ID (diff)
From: bigeasy@linutronix.de (Sebastian Andrzej Siewior) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/8] ARM: Convert boot_lock to raw_lock [msm] Date: Fri, 20 Dec 2013 10:47:40 +0100 [thread overview] Message-ID: <1387532866-22601-3-git-send-email-bigeasy@linutronix.de> (raw) In-Reply-To: <1387532866-22601-1-git-send-email-bigeasy@linutronix.de> From: Frank Rowand <frank.rowand@am.sony.com> The arm boot_lock is used by the secondary processor startup code. The locking task is the idle thread, which has idle->sched_class == &idle_sched_class. idle_sched_class->enqueue_task == NULL, so if the idle task blocks on the lock, the attempt to wake it when the lock becomes available will fail: try_to_wake_up() ... activate_task() enqueue_task() p->sched_class->enqueue_task(rq, p, flags) Fix by converting boot_lock to a raw spin lock. Cc: David Brown <davidb@codeaurora.org> Cc: Daniel Walker <dwalker@fifo99.com> Cc: Bryan Huntsman <bryanh@codeaurora.org> Cc: linux-arm-msm at vger.kernel.org Cc: Frank Rowand <frank.rowand@sonymobile.com> Signed-off-by: Frank Rowand <frank.rowand@am.sony.com> Link: http://lkml.kernel.org/r/4E77B952.3010606 at am.sony.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- arch/arm/mach-msm/platsmp.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c index 3f06edc..fc09a04 100644 --- a/arch/arm/mach-msm/platsmp.c +++ b/arch/arm/mach-msm/platsmp.c @@ -30,7 +30,7 @@ extern void msm_secondary_startup(void); -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static inline int get_core_count(void) { @@ -50,8 +50,8 @@ static void msm_secondary_init(unsigned int cpu) /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static void prepare_cold_cpu(unsigned int cpu) @@ -88,7 +88,7 @@ static int msm_boot_secondary(unsigned int cpu, struct task_struct *idle) * set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * The secondary processor is waiting to be released from @@ -122,7 +122,7 @@ static int msm_boot_secondary(unsigned int cpu, struct task_struct *idle) * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? -ENOSYS : 0; } -- 1.8.5.1
next prev parent reply other threads:[~2013-12-20 9:48 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-12-20 9:47 ARM: Convert boot_lock to raw_lock Sebastian Andrzej Siewior 2013-12-20 9:47 ` [PATCH 1/8] ARM: Convert boot_lock to raw_lock [exynos] Sebastian Andrzej Siewior 2013-12-20 9:47 ` Sebastian Andrzej Siewior 2013-12-20 9:47 ` Sebastian Andrzej Siewior [this message] 2013-12-20 9:47 ` [PATCH 2/8] ARM: Convert boot_lock to raw_lock [msm] Sebastian Andrzej Siewior 2013-12-20 9:47 ` [PATCH 3/8] ARM: Convert boot_lock to raw_lock [omap] Sebastian Andrzej Siewior 2013-12-20 9:47 ` Sebastian Andrzej Siewior 2013-12-20 9:47 ` [PATCH 4/8] ARM: Convert boot_lock to raw_lock [prima2] Sebastian Andrzej Siewior 2013-12-20 9:47 ` [PATCH 5/8] ARM: Convert boot_lock to raw_lock [spear] Sebastian Andrzej Siewior 2013-12-20 9:47 ` [PATCH 6/8] ARM: Convert boot_lock to raw_lock [sti] Sebastian Andrzej Siewior 2013-12-20 9:47 ` [PATCH 7/8] ARM: Convert boot_lock to raw_lock [ux500] Sebastian Andrzej Siewior 2014-01-07 14:05 ` Linus Walleij 2013-12-20 9:47 ` [PATCH 8/8] ARM: Convert boot_lock to raw_lock [versatile] Sebastian Andrzej Siewior
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