On 10/24/07, Mohammad M Molla <[EMAIL PROTECTED]> wrote:
> Its a bit strange that the passed parameter is not used.
>
It is not really strange, as THIS particular tasklet_action() is NOT
using the parameter passed in, but other tasklet_action() are:
./drivers/misc/lkdtm.c:
void jp_tasklet_action(
Actually, it's a stock kernel ported to Coldfire. You might classify
that as custom. I think that the problem may actually be inside of
the FEC driver for the Coldfire CPU. It looks to be that the
fec_rx_handler is what's being run from tasklet_action when the
problem occurs. The FEC driver is
TASKLET_STATE_SCHED is set when tasklet is scheduled using tasklet_schedule or
tasklet_hi_schedule and clear only when the tasklet starts its execution.
Are you using some customized kernel or stock kernel? I believe there should
not be this bug in stock kernel.
- Meraj
Tony Mouawad <[EMAIL P
Very good.
Now I'm trying to figure out why this tasklet_action() code path ends
up calling BUG(). This is a very intermittent problem and seemingly
impossible to reproduce.
404 if(!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
405 BUG();
It's obvious that 404 will result in
Its a bit strange that the passed parameter is not used.
Looking carefully at the code what I understood is, inside the while
loop, tasklets are processed one by one from the temporary list. Look
at the continue, which actually skips the last part of the loop.
Whenver, tasklet_trylock fails, befo
On 10/23/07, Tony Mouawad <[EMAIL PROTECTED]> wrote:
> How does the list in __get_cpu_var(tasklet_vec).list get populated?
> It looks like at the top of the tasklet_action() call the list is set
> to empty and at the bottom __get_cpu_var(tasklet_vec).list is assigned
> to the next element of a temp
What is the purpose of the parameter "struct softirq_action *a" being
passed into tasklet_action() since it doesn't appear to be used
anywhere in the function?
How does the list in __get_cpu_var(tasklet_vec).list get populated?
It looks like at the top of the tasklet_action() call the list is set
it calls BUG() handler. Otherwise
it skips line 405 and calls tasklet handler.
- Meraj
- Original Message
From: Tony Mouawad <[EMAIL PROTECTED]>
To: kernelnewbies
Sent: Monday, October 22, 2007 5:19:05 PM
Subject: tasklet_action() failure
Hello,
I'm trying to get a handl
tasklet_action is called for handling tasklets that have already been
scheduled. So for these tasklets t->state should have TASKLET_STATE_SCHED bit
set.
In line 404, test_and_clear_bit clears TASKLET_STATE_SCHED bit and returns the
old value of that bit. If it returns 0, that means a bug, so i
Hello,
I'm trying to get a handle on a problem that is occuring inside of a
call to tasklet_action(). Can someone explain a bit about what line
404 is doing ( and the function itself ) in the following code? It
seems that the OS is intermittently resulting in a false result on
line 404 and then
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