From: Dave Hansen <dave.hansen@linux.intel.com>
To: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
Borislav Petkov <bp@suse.de>,
Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>
Subject: Re: [PATCH 08/10] x86/xsaves: Fix PTRACE frames for XSAVES
Date: Mon, 22 Feb 2016 14:19:05 -0800 [thread overview]
Message-ID: <56CB8959.9090009@linux.intel.com> (raw)
In-Reply-To: <20160222204828.GC4140@test-lenovo>
On 02/22/2016 12:48 PM, Yu-cheng Yu wrote:
> It should have been:
>
> xsave->header.xfeatures = xfeatures |
> (xsave->header.xfeatures & XFEATURE_MASK_SUPERVISOR);
>
> I'll fix it.
Can we break it out to make it more clear?
/*
* The state that came in from userspace was user-state only.
* Mask all the user states out of 'xfeatures'.
*/
xsave->header.xfeatures &= XFEATURE_MASK_SUPERVISOR;
/*
* add back in the features that came in from userspace
*/
xsave->header.xfeatures |= xfeatures
next prev parent reply other threads:[~2016-02-22 22:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-22 19:00 [PATCH 08/10] x86/xsaves: Fix PTRACE frames for XSAVES Yu-cheng Yu
2016-02-22 20:00 ` Dave Hansen
2016-02-22 20:48 ` Yu-cheng Yu
2016-02-22 22:19 ` Dave Hansen [this message]
2016-02-22 22:29 ` Yu-cheng Yu
2016-02-22 22:45 ` Andy Lutomirski
2016-02-22 22:50 ` Yu-cheng Yu
2016-02-22 22:53 ` Dave Hansen
2016-02-22 22:55 ` Andy Lutomirski
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