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

On Tue, 2015-08-04 at 19:57 +1000, Michael Ellerman wrote:

On Mon, 2015-13-07 at 08:16:06 UTC, Anshuman Khandual wrote:

quoted

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.

...

quoted

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?

Even if it was (at some stage it wasn't, I'd have to look very closely
to see what's the situation now), we certainly don't want to add
overhead to load_up_fpu.

quoted

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

cheers
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