linux-kernel - Re: [PATCH] x86/ACPI/cstate: Allow ACPI C1 FFH MWAIT use on AMD systems

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Message-ID: <20170523122439.GA7483@amd>
Date:   Tue, 23 May 2017 14:24:39 +0200
From:   Pavel Machek <pavel@....cz>
To:     Yazen Ghannam <Yazen.Ghannam@....com>
Cc:     linux-pm@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, rjw@...ysocki.net,
        len.brown@...el.com
Subject: Re: [PATCH] x86/ACPI/cstate: Allow ACPI C1 FFH MWAIT use on AMD
 systems

On Wed 2017-05-17 09:20:19, Yazen Ghannam wrote:
> From: Yazen Ghannam <yazen.ghannam@....com>
> 
> AMD systems support the Monitor/Mwait instructions and these can be used
> for ACPI C1 in the same way as on Intel systems, with appropriate BIOS
> support.
> 
> Allow ffh_cstate_init() to succeed on AMD systems and make the Cstate
> description vendor-agnostic.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
>  arch/x86/kernel/acpi/cstate.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
> index 8a908ae..4c5dd5d 100644
> --- a/arch/x86/kernel/acpi/cstate.c
> +++ b/arch/x86/kernel/acpi/cstate.c
> @@ -109,7 +109,7 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
>  			cx->type);
>  	}
>  	snprintf(cx->desc,
> -			ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
> +			ACPI_CX_DESC_LEN, "ACPI FFH X86 MWAIT 0x%x",
>  			cx->address);
>  out:
>  	return retval;

Are you sure no userspace depends on word "INTEL" there?

Does it make sense to include "X86" there?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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