From: Jiang Liu
Reuse FPSIMD hardware context if it hasn't been touched by other thread
yet, so we can get rid of unnecessary FPSIMD context restores. This is
especially useful when switching between kernel thread and user thread
because kernel thread usaually doesn't touch FPSIMD registers.
From: Jiang Liu jiang@huawei.com
Reuse FPSIMD hardware context if it hasn't been touched by other thread
yet, so we can get rid of unnecessary FPSIMD context restores. This is
especially useful when switching between kernel thread and user thread
because kernel thread usaually doesn't touch
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