linux-kernel - Re: [PATCH 1/6] x86/fpu: change copy_xstate_to_uabi_buf() to accept fpstate + pkru instead of task

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Message-ID: <20250815122203.GC11549@redhat.com>
Date: Fri, 15 Aug 2025 14:22:03 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Cc: "mingo@...nel.org" <mingo@...nel.org>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"bp@...en8.de" <bp@...en8.de>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"Mehta, Sohil" <sohil.mehta@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 1/6] x86/fpu: change copy_xstate_to_uabi_buf() to accept
 fpstate + pkru instead of task_struct

On 08/14, Edgecombe, Rick P wrote:
>
> On Thu, 2025-08-14 at 12:14 +0200, Oleg Nesterov wrote:
> > Preparation for the next change.
> >
> > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
>
> These patches and the coverletter have very little information.

Agreed. I forgot to add the links to the previous discussions,
please see

	Warning from x86_task_fpu()
	https://lore.kernel.org/all/aJVuZZgYjEMxiUYq@ly-workstation/

	PF_USER_WORKERs and shadow stack
	https://lore.kernel.org/all/20250813162824.GA15234@redhat.com/

Oleg.