On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
> > -Original Message-
> > From: Thomas Gleixner [mailto:t...@linutronix.de]
> > Sent: Friday, February 21, 2014 7:53 PM
> > To: Liu, Chuansheng
> > Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
> >
Hello Thomas,
> -Original Message-
> From: Thomas Gleixner [mailto:t...@linutronix.de]
> Sent: Friday, February 21, 2014 7:53 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
> Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq
On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
> > > > I think you have a point there, but not on x86 wherre the atomic_dec
> > > > and the spinlock on the queueing side are full barriers. For non-x86
> > > > there is definitely a potential issue.
> > > >
> > > But even on X86, spin_unlock has no
> -Original Message-
> From: Thomas Gleixner [mailto:t...@linutronix.de]
> Sent: Friday, February 21, 2014 7:11 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
> Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
> wai
Xiaoming
> > Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
> > wait-forever
> >
> > On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
> > > But feels there is another case which the synchronize_irq waited there
> > f
Hello Thomas,
> -Original Message-
> From: Thomas Gleixner [mailto:t...@linutronix.de]
> Sent: Friday, February 21, 2014 6:34 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
> Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq
On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
> But feels there is another case which the synchronize_irq waited there
> forever,
> it is no waking up action from irq_thread().
>
> CPU0 CPU1
> disable_irq() irq_thread()
> synchronize_irq()
On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
But feels there is another case which the synchronize_irq waited there
forever,
it is no waking up action from irq_thread().
CPU0 CPU1
disable_irq() irq_thread()
synchronize_irq()
Hello Thomas,
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Friday, February 21, 2014 6:34 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
wait-forever
On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
Hello Thomas,
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Friday, February 21, 2014 6:34 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: RE: [PATCH 1/2] genirq: Fix
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Friday, February 21, 2014 7:11 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
wait-forever
On Fri, 21 Feb
On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
I think you have a point there, but not on x86 wherre the atomic_dec
and the spinlock on the queueing side are full barriers. For non-x86
there is definitely a potential issue.
But even on X86, spin_unlock has no full barrier, the
Hello Thomas,
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Friday, February 21, 2014 7:53 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
wait-forever
On Fri, 21 Feb 2014, Liu, Chuansheng wrote:
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Friday, February 21, 2014 7:53 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: RE: [PATCH 1/2] genirq: Fix the possible
Hello Thomas,
> -Original Message-
> From: Thomas Gleixner [mailto:t...@linutronix.de]
> Sent: Thursday, February 20, 2014 8:53 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
> Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq
Xiaoming
> > Subject: Re: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
> > wait-forever
> >
> > On Mon, 10 Feb 2014, Chuansheng Liu wrote:
> > > There is below race between irq handler and irq thread:
> > > irq handler
On Thu, 20 Feb 2014, Liu, Chuansheng wrote:
Hello Thomas,
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Monday, February 10, 2014 4:58 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: Re: [PATCH 1/2] genirq: Fix
Hello Thomas,
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Thursday, February 20, 2014 8:53 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: RE: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
wait-forever
Hello Thomas,
> -Original Message-
> From: Thomas Gleixner [mailto:t...@linutronix.de]
> Sent: Monday, February 10, 2014 4:58 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
> Subject: Re: [PATCH 1/2] genirq: Fix the possible synchronize_irq
Hello Thomas,
-Original Message-
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Monday, February 10, 2014 4:58 PM
To: Liu, Chuansheng
Cc: linux-kernel@vger.kernel.org; Wang, Xiaoming
Subject: Re: [PATCH 1/2] genirq: Fix the possible synchronize_irq()
wait-forever
On Mon, 10 Feb 2014, Chuansheng Liu wrote:
> There is below race between irq handler and irq thread:
> irq handler irq thread
>
> irq_wake_thread() irq_thread()
> set bit RUNTHREAD
> ...clear bit RUNTHREAD
>
There is below race between irq handler and irq thread:
irq handler irq thread
irq_wake_thread() irq_thread()
set bit RUNTHREAD
...clear bit RUNTHREAD
thread_fn()
There is below race between irq handler and irq thread:
irq handler irq thread
irq_wake_thread() irq_thread()
set bit RUNTHREAD
...clear bit RUNTHREAD
thread_fn()
On Mon, 10 Feb 2014, Chuansheng Liu wrote:
There is below race between irq handler and irq thread:
irq handler irq thread
irq_wake_thread() irq_thread()
set bit RUNTHREAD
...clear bit RUNTHREAD
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