Disabling interrupts in user space (Linux)

[Josef]

Hi,

I am wondering, if there is a way of disabling (maskable) interrupts
on Linux (v3.1) in user space. The following inline assembly code is
ignored when it is executed:

asm volatile ("cpsid if" : : : "memory", "cc");

Doing the same in a kernel module seems to work.

Thanks,
Josef

[Perry Hung]

Can't be done in userspace.

Allowing this would allow any userspace program to completely bring
down the machine!