> extern unsigned long elf_hwcap;
> +#ifdef CONFIG_FPU
> +extern bool no_fpu;
> +#endif
No need to have an ifdef around an extern declaration.
> static inline void fstate_save(struct task_struct *task,
> struct pt_regs *regs)
> {
> + if (unlikely(no_fpu))
> +
We expect that a kernel with CONFIG_FPU=y can still support no-FPU machines.
To do so, the kernel should first examine the existence of a FPU, then
do nothing if a FPU does exist; otherwise, it should disable/bypass all
FPU-related functions.
In this patch, a new global variable, no_fpu, is create
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