linux-kernel - Re: [PATCH] x86/fpu: Remove 'eagerfpu=' docs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20161008053904.GA7092@gmail.com>
Date:   Sat, 8 Oct 2016 07:39:04 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, Rik van Riel <riel@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/fpu: Remove 'eagerfpu=' docs

* Andy Lutomirski <luto@...nel.org> wrote:

> Now that eagerfpu= is gone, remove it from the docs.  Whoops.
> 
> Fixes: ca6938a1cd8a ("x86/fpu: Hard-disable lazy FPU mode")
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  Documentation/kernel-parameters.txt | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 25037ded3683..8083a3432482 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1034,12 +1034,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  	nopku		[X86] Disable Memory Protection Keys CPU feature found
>  			in some Intel CPUs.
>  
> -	eagerfpu=	[X86]
> -			on	enable eager fpu restore
> -			off	disable eager fpu restore
> -			auto	selects the default scheme, which automatically
> -				enables eagerfpu restore for xsaveopt.
> -
>  	module.async_probe [KNL]
>  			Enable asynchronous probe on this module.

Could we make the eagerfpu removal more exhaustive please:

triton:~/tip> git grep -i eagerfpu 
Documentation/kernel-parameters.txt:    eagerfpu=       [X86]
Documentation/kernel-parameters.txt:                            enables eagerfpu restore for xsaveopt.
arch/x86/include/asm/cpufeatures.h:/* free, was #define X86_FEATURE_EAGER_FPU   ( 3*32+29) * "eagerfpu" Non lazy FPU restore */
arch/x86/include/asm/fpu/types.h:        * or not. On such CPUs we activate the non-lazy ('eagerfpu')
arch/x86/mm/pkeys.c: * using eagerfpu mode makes this possible.
tools/arch/x86/include/asm/cpufeatures.h:#define X86_FEATURE_EAGER_FPU  ( 3*32+29) /* "eagerfpu" Non lazy FPU restore */

Thanks,

	Ingo