what does this mean?

[Steve Iribarne (GMail)]

My code is hitting in sched.c -

if (unlikely(in_interrupt())) {
printk(Scheduling in interrupt\n);
BUG();
}
It is hitting this printk.  So is this telling me I'm calling schedule
from within an interrupt?  How can this be?  Has anyone else seen
something like this and can anyone give me a hint as to what to look
for.

Thanks.
-stv

what does this mean?

[Walter L. Wimer III]

On Tue, 2006-05-16 at 09:51 -0700, Steve Iribarne (GMail) wrote:
 My code is hitting in sched.c -
 
   if (unlikely(in_interrupt())) {
   printk(Scheduling in interrupt\n);
   BUG();
   }
 It is hitting this printk.  So is this telling me I'm calling schedule
 from within an interrupt?  How can this be?  Has anyone else seen
 something like this and can anyone give me a hint as to what to look
 for.

Check to make sure that in your interrupt handler you are not calling
something that can sleep.  E.g. sleep(), usleep(), kmalloc(), vmalloc(),
etc. 


 Thanks.
 -stv


Best regards,

Walt Wimer
TimeSys Corporation

what does this mean?

[Walter L. Wimer III]

On Tue, 2006-05-16 at 13:38 -0400, Walter L. Wimer III wrote:
 Check to make sure that in your interrupt handler you are not calling
 something that can sleep.  E.g. sleep(), usleep(), kmalloc(),
 vmalloc(), etc. 

Also watch out for semaphore operations such as down() and
down_interruptible().  They can sleep too.


Walt

what does this mean?

[Steve Iribarne (GMail)]

Thanks.  That's what I think it is, but I didn't write this code so
I'm trying to track down
who is calling down at interrupt time.



On 5/16/06, Walter L. Wimer III walt.wimer at timesys.com wrote:
 On Tue, 2006-05-16 at 13:38 -0400, Walter L. Wimer III wrote:
  Check to make sure that in your interrupt handler you are not calling
  something that can sleep.  E.g. sleep(), usleep(), kmalloc(),
  vmalloc(), etc.

 Also watch out for semaphore operations such as down() and
 down_interruptible().  They can sleep too.


 Walt

What does KERNELBASE mean?

[LiuTao]

Hi:

In linux/arch/ppc/kernel/head.S, what does KERNELBASE mean?
What does the following mean?
.long  TOPHYS(__start),0,0

Thanks.

LiuTao

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

What does KERNELBASE mean?

[Alan Mimms]

This .long stuff dates back to the POWER architecture (IBM) beginnings of
PowerPC wherein IBM and later Apple defined a three (or even longer) word table
of contents entry for each global entry point.  The first word was the pointer
to the function, the second word was the pointer to be used for the
subroutine's duration for its TOC register value and the third word was some
kinda magical language defined extra thingie nobody ever used as far as I know.

Effectively, its a larger style function pointer.

The boot ROMs on some PowerPC machines (Apple's Open Firmware for example)
expect the entry point of a loaded image to have one of these at the entry
point location.  They simply load the value there and jump to it to start the
loaded image.

 On Tue, 04 Jan 2000, LiuTao wrote:
 Hi:
 
 In linux/arch/ppc/kernel/head.S, what does KERNELBASE mean?
 What does the following mean?
 .longTOPHYS(__start),0,0
 
 Thanks.
 
 LiuTao
-- 
Alan Mimms Packet Engines, Inc. Spokane, Washington [99214-0497]
  USA, Earth, Sol, Milky Way, The Local Group, Virgo Supercluster, U0
Despite the cost of living, have you noticed how popular it remains?
  -- Steven Wright?

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

What does KERNELBASE mean?

[Alan Mimms]

KERNELBASE is the virtual address the physical RAM is mapped to.

On most kernels on PowerPC this is 0xC000.  If you subtract KERNELBASE from
a virtual address, you get its physical address in RAM, since PowerPC platforms
more or less universally define that RAM starts at 0x.  Hence the name
TOPHYS.

a

On Tue, 04 Jan
2000, LiuTao wrote:  Hi:
 
 In linux/arch/ppc/kernel/head.S, what does KERNELBASE mean?
 What does the following mean?
 .longTOPHYS(__start),0,0
 
 Thanks.
 
 LiuTao
-- 
Alan Mimms Packet Engines, Inc. Spokane, Washington [99214-0497]
  USA, Earth, Sol, Milky Way, The Local Group, Virgo Supercluster, U0
Despite the cost of living, have you noticed how popular it remains?
  -- Steven Wright?

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/