From: Dave Hansen <dave.hansen@intel.com>
To: Khalid Ali <khaliidcaliy@gmail.com>,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com
Cc: x86@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86/kerrnel/FPU: clear MP bit of cr0
Date: Tue, 3 Jun 2025 09:29:48 -0700 [thread overview]
Message-ID: <373bbdbb-1755-425c-90bf-1bb7d40944cb@intel.com> (raw)
In-Reply-To: <20250526082414.689-1-khaliidcaliy@gmail.com>
On 5/26/25 01:22, Khalid Ali wrote:
> Clear MP bit when initializing x87 FPU, since what it does
> is making WAIT/FWAIT instructions to react to setting of TS flag.
> Right now TS bit is cleared so MP should be cleared, as it is not
> needed. This should set the bit in defined state.
Hi Khalid,
What is the user visible result of this change?
Could you also give us a little more background about how you came upon
this problem? Was a program misbehaving and you narrowed it down to
this? Did you find it by inspection?
next prev parent reply other threads:[~2025-06-03 16:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-26 8:22 [PATCH] x86/kerrnel/FPU: clear MP bit of cr0 Khalid Ali
2025-06-03 16:29 ` Dave Hansen [this message]
2025-06-04 22:35 ` H. Peter Anvin
2025-06-04 22:42 ` H. Peter Anvin
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