linux-kernel - Re: [PATCH 4/8] x86/fpu: Remove the thread::fpu pointer

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Message-ID: <Z_eis4nbGK6-SPjP@gmail.com>
Date: Thu, 10 Apr 2025 12:51:31 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
	Dave Hansen <dave@...1.net>, Brian Gerst <brgerst@...il.com>,
	Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Chang S . Bae" <chang.seok.bae@...el.com>,
	Andy Lutomirski <luto@...nel.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Uros Bizjak <ubizjak@...il.com>
Subject: Re: [PATCH 4/8] x86/fpu: Remove the thread::fpu pointer


* Ingo Molnar <mingo@...nel.org> wrote:

> BTW., Oleg suggested in a previous discussion for us to replace the 
> task->thread.fpu pointer with a build-time calculation - but I'm 
> still not sure it's a good idea.

Actually, I've implemented that already:

  arch/x86/include/asm/processor.h:# define x86_task_fpu(task)    ((struct fpu *)((void *)(task) + sizeof(*(task))))

... then promptly forgot about it. So never mind me. :-)

Thanks,

	Ingo