linux-kernel - RE: [PATCH v10 13/38] x86/cpu: Add X86_CR4

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Date:   Wed, 20 Sep 2023 17:25:21 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     Nikolay Borisov <nik.borisov@...e.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
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        "bp@...en8.de" <bp@...en8.de>,
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Subject: RE: [PATCH v10 13/38] x86/cpu: Add X86_CR4_FRED macro

> > +#ifdef __x86_64__
> > +#define X86_CR4_FRED_BIT	32 /* enable FRED kernel entry */
> > +#define X86_CR4_FRED		_BITUL(X86_CR4_FRED_BIT)
> 
> nit: s/BITUL/BITULL I guess if __x86_64__ is defined then we are
> guaranteed that unsigned long will be a 64 bit, but for the sake of
> clarity I'd rather have this spelled out explicitly by using BITULL
>

UL is better because CR4 is a machine word.

> 
> 
> > +#else
> > +#define X86_CR4_FRED		(0)
> > +#endif