linux-kernel - Re: [PATCH v3 01/21] x86/fpu/xstate: Modify initialization helper to handle both static and dynamic buffers

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Message-ID: <20210115124038.GA11337@zn.tnic>
Date:   Fri, 15 Jan 2021 13:40:38 +0100
From:   Borislav Petkov <bp@...e.de>
To:     "Chang S. Bae" <chang.seok.bae@...el.com>
Cc:     luto@...nel.org, tglx@...utronix.de, mingo@...nel.org,
        x86@...nel.org, len.brown@...el.com, dave.hansen@...el.com,
        jing2.liu@...el.com, ravi.v.shankar@...el.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 01/21] x86/fpu/xstate: Modify initialization helper to
 handle both static and dynamic buffers

On Wed, Dec 23, 2020 at 07:56:57AM -0800, Chang S. Bae wrote:
> In preparation for dynamic xstate buffer expansion, update the buffer
> initialization function parameters to equally handle static in-line xstate
> buffer, as well as dynamically allocated xstate buffer.
> 
> init_fpstate is a special case, which is indicated by a null pointer
> parameter to fpstate_init().
> 
> Also, fpstate_init_xstate() now accepts the state component bitmap to
> configure XCOMP_BV for the compacted format.
> 
> No functional change.

Much better, thanks!

> diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
> index eb86a2b831b1..f23e5ffbb307 100644
> --- a/arch/x86/kernel/fpu/core.c
> +++ b/arch/x86/kernel/fpu/core.c
> @@ -191,8 +191,16 @@ static inline void fpstate_init_fstate(struct fregs_state *fp)
>  	fp->fos = 0xffff0000u;
>  }
>  
> -void fpstate_init(union fpregs_state *state)
> +/* A null pointer parameter indicates init_fpstate. */

Use kernel-doc comment style instead:

/**
 * ..
 *
 * @fpu: If NULL, use init_fpstate
 */

> +void fpstate_init(struct fpu *fpu)
>  {

...

-- 
Regards/Gruss,
    Boris.

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