[microblaze-uclinux] undefined __down_interruptible and __up

[<victor-sv_yeo@xxxxxxxxxxx>]

Hi,

 

I have a device driver, I compiled the driver on petalinux-v0.30-rc1. The device driver declares a semaphore using:

 

DECLARE_MUTEX(sem);

 

Then I use:

 

down_interruptible(&sem) and up(&sem)

 

When I build the driver, I see the following warning messages:

            Building modules, stage 2.

MODPOST 1 modules

WARNING: “__up” [……/scull.ko] undefined!

WARNING: “__down_interruptible” [……/scull.ko] undefined!

 

and I cannot do insmod due to the above unknown symbols.

 

Has anyone used semaphore successfully on microblaze linux before?

 

Thank you,

Victor Yeo