From: Borislav Petkov <bp@alien8.de>
To: Pu Wen <puwen@hygon.cn>
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH RESEND] x86/cpu: Avoid endless loop to get the number of cache leaves
Date: Thu, 6 Dec 2018 11:37:36 +0100 [thread overview]
Message-ID: <20181206103736.GA3986@zn.tnic> (raw)
In-Reply-To: <1544081173-25059-1-git-send-email-puwen@hygon.cn>
On Thu, Dec 06, 2018 at 03:26:13PM +0800, Pu Wen wrote:
> To get the number of cache leaves on AMD or Hygon platform, it should
> get the value of cpuid leaf 0x8000001d. But on certain broken platform
> such as a not fullly implemented virtual platform(for example Xen),
> the value of the cpuid leaf will nerver be CTYPE_NULL, so the kernel
> will run into an endless loop.
>
> To fix this problem, add a new enum type CTYPE_MAX to limit the maximum
> cpuid accessing.
>
> Signed-off-by: Pu Wen <puwen@hygon.cn>
> ---
> arch/x86/kernel/cpu/cacheinfo.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Did you not see my reply to this last time?
https://lkml.kernel.org/r/20181115172155.GB25056@zn.tnic
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2018-12-06 10:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 7:26 [RFC PATCH RESEND] x86/cpu: Avoid endless loop to get the number of cache leaves Pu Wen
2018-12-06 10:37 ` Borislav Petkov [this message]
2018-12-08 3:52 ` Pu Wen
2018-12-08 3:56 ` Pu Wen
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