[V3] powerpc/irq: Enable some more exceptions in /proc/interrupts interface

[Michael Ellerman]

On Mon, 2015-13-07 at 08:16:06 UTC, Anshuman Khandual wrote:
> This patch enables facility unavailable exceptions for generic facility,
> FPU, ALTIVEC and VSX in /proc/interrupts listing by incrementing their
> newly added IRQ statistical counters as and when these exceptions happen.
> This also adds couple of helper functions which will be called from within
> the interrupt handler context to update their statistics. Similarly this
> patch also enables alignment and program check exceptions as well.

...

> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
> index 0a0399c2..a86180c 100644
> --- a/arch/powerpc/kernel/exceptions-64s.S
> +++ b/arch/powerpc/kernel/exceptions-64s.S
> @@ -1158,6 +1158,7 @@ BEGIN_FTR_SECTION
>  END_FTR_SECTION_IFSET(CPU_FTR_TM)
>  #endif
>  	bl	load_up_fpu
> +	bl	fpu_unav_exceptions_count

Is it safe to call C code here?

>  	b	fast_exception_return
>  #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
>  2:	/* User process was in a transaction */


cheers