linux-kernel - Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative

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Date:   Wed, 25 Oct 2023 15:57:36 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ajay Kaher <akaher@...are.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to
 alternative

On 25.10.23 15:44, Borislav Petkov wrote:
> On Wed, Oct 25, 2023 at 03:31:07PM +0200, Juergen Gross wrote:
>> There is
>>
>> #define nop() asm volatile ("nop")
>>
>> in arch/x86/include/asm/special_insns.h already.
> 
> Then call it "nop_func" or so.

Okay.

> 
>> It might not be needed now, but are you sure we won't need it in future?
> 
> No, I'm not.
> 
> What I'm sure of is: stuff should be added to the kernel only when
> really needed. Not in the expectation that it might potentially be
> needed at some point.

Will double check whether it is needed now.


Juergen

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