From: Will Deacon <will.deacon@arm.com>
Date: Thu, 10 Jul 2014 11:40:09 +0000 (+0100)
Subject: arm64: fpsimd: avoid restoring fpcr if the contents haven't changed
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~183^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5959e25729a521097856d71528504deda1e11584;p=pandora-kernel.git

arm64: fpsimd: avoid restoring fpcr if the contents haven't changed

Writing to the FPCR is commonly implemented as a self-synchronising
operation in the CPU, so avoid writing to the register when the saved
value matches that in the hardware already.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

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