Re: [tip:x86/urgent] x86/nmi: Test saved %cs in NMI to determinenested NMI case

[Linus Torvalds]

On Mon, Feb 20, 2012 at 3:47 AM, tip-bot for Steven Rostedt
<rostedt@xxxxxxxxxxx> wrote:
>        /*
> +        * If %cs was not the kernel segment, then the NMI triggered in user
> +        * space, which means it is definitely not nested.
> +        */
> +       cmp $__KERNEL_CS, 16(%rsp)
> +       jne first_nmi

I don't like how you wrote 'cmp' without a size, especially with none
of the arguments then giving a size either. Usually there's a register
name or something that gives you the size, but not here.

I guess there is some default size that gas will use, but at least
some versions of gas have traditionally errored out instead of
guessing on sizes. Maybe x86-64 doesn't use those gas versions any
more, but still..

                                        Linus
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