Hi All,
attached patch solves a kernel OOPS discovered while running LTP 
testsuite (doio test) with kernel 2.6.23.y (rootf on hd).
Attached for your reference the output of the test and the kernel oops.

The problems is within the SH implementation of resume_kernel code,
that implements in assembly the bulk of preempt_schedule_irq function 
without taking care of the extra code needed to handle the BKL preemptible.

The patch basically consists of removing this asm code and calling the 
common C implementation (see kernel/sched.c) as other archs do.

Another change is the missing 'cli' macro invocation at the beginning of 
the resume_kernel.

In the new kernels (2.6.26 and later) this patch may be not so required 
because BKL will be again *not* preemptible; anyway, it may be worth 
aligning the SH implementation with others to rely on common C code.


Best regards,
Carmelo & Peppe