Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature on i386

[Andi Kleen]

Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx> writes:
>  
> +	.macro FTRACE_SAVE_ALL
> +	/* eflags is saved on cs */
> +	subl $8, %esp		/* skip ip and orig_ax */
> +	pushl %gs
> +	pushl %fs

For pure in kernel use you don't need to save/restore fs/gs
This is only needed on kernel/user space boundaries.

And for this usage probably also not flags


-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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