From: Maciej W. Rozycki <macro@linux-mips.org>
Date: Fri, 3 Apr 2015 22:32:08 +0000 (+0100)
Subject: MIPS: DEC: Implement FPU interrupt counter
X-Git-Tag: omap-for-v4.1/fixes-rc1~111^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f02cf4691e19ab61d4415b2fbfeb64aa8a93757e;p=pandora-kernel.git

MIPS: DEC: Implement FPU interrupt counter

Implement a cheap way to count FPU interrupts for R2k/R3k DECstation
systems.  Do this manually in handcoded assembly, rather than calling
`kstat_incr_irq_this_cpu' that would require setting up a stack frame
and a lot of redirection.  This is not going to be a problem because the
FPU interrupt is local to the CPU and also there is one CPU only anyway.

So at bootstrap determine the address of the correct location within
`struct irq_desc', and then only refer to it directly in the interrupt
handler.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9713/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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