linux-kernel - Re: [patch V4 07/65] x86/fpu: Move inlines where they belong

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Date:   Wed, 23 Jun 2021 18:43:07 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Yu, Yu-cheng" <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Kan Liang" <kan.liang@...ux.intel.com>,
        Megha Dey <megha.dey@...ux.intel.com>,
        "Sang, Oliver" <oliver.sang@...el.com>
Subject: Re: [patch V4 07/65] x86/fpu: Move inlines where they belong

On Jun 23, 2021, at 05:01, Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> They are only used in fpstate_init() and there is no point to have them in
> a header just to make reading the code harder.

<snip>

> -static inline void fpstate_init_xstate(struct xregs_state *xsave)
> -{
> -	/*
> -	 * XRSTORS requires these bits set in xcomp_bv, or it will
> -	 * trigger #GP:
> -	 */
> -	xsave->header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT | xfeatures_mask_all;
> -}

static void __init setup_init_fpu_buf(void)
{
...

	if (boot_cpu_has(X86_FEATURE_XSAVES))
		init_fpstate.xsave.header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT |
						     xfeatures_mask_all;


But this line [1] can be exactly replaced with the inline function above. At
least, I don’t see consistency on the mainline.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/fpu/xstate.c#n460

Thanks,
Chang