From: Huang Ying <ying.huang@intel.com>
Date: Mon, 31 Aug 2009 05:11:54 +0000 (+0800)
Subject: x86: Move kernel_fpu_using to irq_fpu_usable in asm/i387.h
X-Git-Tag: v2.6.32-rc1~711^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae4b688db2432baad379f73fdcac13ec24f603d5;p=pandora-kernel.git

x86: Move kernel_fpu_using to irq_fpu_usable in asm/i387.h

This function measures whether the FPU/SSE state can be touched in
interrupt context. If the interrupted code is in user space or has no
valid FPU/SSE context (CR0.TS == 1), FPU/SSE state can be used in IRQ
or soft_irq context too.

This is used by AES-NI accelerated AES implementation and PCLMULQDQ
accelerated GHASH implementation.

v3:
 - Renamed to irq_fpu_usable to reflect the purpose of the function.

v2:
 - Renamed to irq_is_fpu_using to reflect the real situation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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