linux-kernel - Re: [PATCH v3 4/4] Add R3MWAIT to CPU features

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Date:   Thu, 13 Oct 2016 17:39:34 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
cc:     mingo@...hat.com, hpa@...or.com, x86@...nel.org, bp@...e.de,
        dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org,
        lukasz.daniluk@...el.com, james.h.cownie@...el.com,
        jacob.jun.pan@...el.com
Subject: Re: [PATCH v3 4/4] Add R3MWAIT to CPU features

On Thu, 13 Oct 2016, Grzegorz Andrejczuk wrote:
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -1108,6 +1108,9 @@ static void identify_cpu(struct cpuinfo_x86 *c)
>  #endif
>  	/* The boot/hotplug time assigment got cleared, restore it */
>  	c->logical_proc_id = topology_phys_to_logical_pkg(c->phys_proc_id);
> +
> +	if (cpu_has(c, X86_FEATURE_PHIR3MWAIT))
> +		elf_hwcap2 |= HWCAP2_PHIR3MWAIT;

Why can't you just set that bit in probe_xeon_phi_r3mwait()?

Just because its so much fun to sprinkle code at random places, right?

Sigh.

	tglx