Re: [patch] Real-Time Preemption, -RT-2.6.12-rc5-V0.7.47-15

[Michal Schmidt <xschmi00@xxxxxxxxxxxxxxxxxx>]

Serge Noiraud wrote:
> Kernel: arch/i386/boot/bzImage is ready
>   Building modules, stage 2.
>   MODPOST
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/scsi/qla2xxx/qla2xxx.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/pci/hotplug/shpchp.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/pci/hotplug/pciehp.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/pci/hotplug/pci_hotplug.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/pci/hotplug/ibmphp.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/pci/hotplug/cpqphp.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/net/plip.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/char/watchdog/cpu5wdt.ko] undefined!
> *** Warning: "there_is_no_init_MUTEX_LOCKED_for_RT_semaphores" [drivers/block/sx8.ko] undefined!

Have you tried loading and using some of these modules with older -RT 
kernels? If they have been using init_MUTEX_LOCKED on RT semaphores, 
they should have BUG & Oops. Recent -RT kernels have added extra check 
for this during linking. The fact that you are prevented from building 
these modules is a Good Thing(TM).
Maybe these drivers should be using completions instead of semaphores.
A quick fix would be changing the 'struct semaphore' to 'struct 
compat_semaphore'.

Michal
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