On Mon, Dec 05, 2016 at 05:01:13PM -0800, Andy Lutomirski wrote:
> That message isn't at all clear -- what does "Legacy x87" even
> mean?
>
> Clarify it. If there's no FPU, say "x86/fpu: No FPU detected". If
> there's an FPU that doesn't have XSAVE, say "x86/fpu: Pre-XSAVE x87
> FPU detected".
>
> Signed-off-by: Andy Lutomirski <[email protected]>
> ---
> arch/x86/kernel/fpu/xstate.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
> index 1d7770447b3e..2d592b1c75e4 100644
> --- a/arch/x86/kernel/fpu/xstate.c
> +++ b/arch/x86/kernel/fpu/xstate.c
> @@ -705,8 +705,13 @@ void __init fpu__init_system_xstate(void)
> WARN_ON_FPU(!on_boot_cpu);
> on_boot_cpu = 0;
>
> + if (!boot_cpu_has(X86_FEATURE_FPU)) {
> + pr_info("x86/fpu: No FPU detected.\n");
> + return;
> + }
> +
> if (!boot_cpu_has(X86_FEATURE_XSAVE)) {
> - pr_info("x86/fpu: Legacy x87 FPU detected.\n");
> + pr_info("x86/fpu: Pre-XSAVE x87 FPU detected.\n");
Well, there's also FXSAVE and FSAVE. The legacy thing kinda made sense
to me here.
Maybe say something like this:
pr_info("x86/fpu: FPU detected: FSAVE|FXSAVE|XSAVE support\n", ...
and use X86_FEATURE_XSAVE and X86_FEATURE_FXSR to print the respective
*SAVE string...? FSAVE we issue by default.
Hmm.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
