linux-kernel - Re: [PATCH] x86/cpu: Avoid endless loop to get the number of cache leaves

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Message-ID: <20181208111232.GB30399@zn.tnic>
Date:   Sat, 8 Dec 2018 12:12:32 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Pu Wen <puwen@...on.cn>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/cpu: Avoid endless loop to get the number of cache
 leaves

On Sat, Dec 08, 2018 at 10:46:54AM +0800, Pu Wen wrote:
> How about define CTYPE_MAX like this:
> #define CTYPE_MAX  4

How about you look at the definition of CPUID leaf 4 and think about it
a bit and realize that this is the wrong thing to do?

> It will return CTYPE_NULL when accessing the 4th CPUID leaf in most of
> the cases, but in certain case it will not.

Well, that's certain cases' problem, isn't it? How about fixing xen
instead?

-- 
Regards/Gruss,
    Boris.

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