On Thu, 2006-12-21 at 10:41 +0100, Sorin Manolache wrote:
> Dear list,
>
> I am in the process of learning how to write linux device drivers.
>
> I have a 2.6.16.5 kernel running on a monoprocessor machine.
We usually call that a Uniprocessor or just UP.
> #CONFIG_SMP is not set
> CONFIG_DEBUG
: Thursday, December 21, 2006 2:20 AM
To: Sorin Manolache
Cc: linux-kernel@vger.kernel.org
Subject: Re: newbie questions about while (1) in kernel mode and
spinlocks
On Thu, 21 Dec 2006 10:41:44 +0100
"Sorin Manolache" <[EMAIL PROTECTED]> wrote:
> spin_lock(&lck);
> down
Sorin Manolache wrote:
The Linux Device Drivers book says that a spin_lock should not be
shared between a process and an interrupt handler. The explanation is
that the process may hold the lock, an interrupt occurs, the interrupt
handler spins on the lock held by the process and the system freez
On Thu, 21 Dec 2006 10:41:44 +0100
"Sorin Manolache" <[EMAIL PROTECTED]> wrote:
> while (1)
> ;
>
> in the read function of a test device driver. I expect the calling
> process to freeze, and then a timer interrupt to preempt the kernel
> and to schedule another process. This does not happen,
On Thu, 21 Dec 2006 10:41:44 +0100
"Sorin Manolache" <[EMAIL PROTECTED]> wrote:
> spin_lock(&lck);
> down(&sem); /* I know that one shouldn't sleep when holding a lock */
> /* but I want to understand why */
I suppose because the lock is held for an indefinite amount of time a
On Thu, 21 Dec 2006 10:41:44 +0100
"Sorin Manolache" <[EMAIL PROTECTED]> wrote:
> The Linux Device Drivers book says that a spin_lock should not be
> shared between a process and an interrupt handler. The explanation is
> that the process may hold the lock, an interrupt occurs, the interrupt
> han
Dear list,
I am in the process of learning how to write linux device drivers.
I have a 2.6.16.5 kernel running on a monoprocessor machine.
#CONFIG_SMP is not set
CONFIG_DEBUG_SPINLOCK=y.
CONFIG_PREEMPT=y
CONFIG_PREEMPT_BKL=y
First question:
I wrote
while (1)
;
in the read function of a te
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