kernelconfig_penguin
CONFIG_ARC_FPU_SAVE_RESTORE is not available for the default architecture x86.
Result is shown for architecture arc

Enable FPU state persistence across context switch

modulename: fpu.ko
configname: CONFIG_ARC_FPU_SAVE_RESTORE

Linux Kernel Configuration
└─> ARC Architecture Configuration
└─> ARC CPU Configuration
└─> Enable FPU state persistence across context switch

Double Precision Floating Point unit had dedicated regs which
need to be saved/restored across context-switch.
Note that ARC FPU is overly simplistic, unlike say x86, which has
hardware pieces to allow software to conditionally save/restore,
based on actual usage of FPU by a task. Thus our implemn does
this for all tasks in system.


source code:


arch/arc/kernel/fpu.c