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    SubjectRE: [PATCH 200/208] x86/fpu/xstate: Don't assume the first zero xfeatures zero bit means the end
    Date
    > From: Ingo Molnar [mailto:mingo.kernel.org@gmail.com] On Behalf Of Ingo
    > Molnar
    > Sent: Tuesday, May 05, 2015 10:58 AM
    > To: linux-kernel@vger.kernel.org
    > Cc: Andy Lutomirski; Borislav Petkov; Dave Hansen; Yu, Fenghua; H. Peter
    > Anvin; Linus Torvalds; Oleg Nesterov; Thomas Gleixner
    > Subject: [PATCH 200/208] x86/fpu/xstate: Don't assume the first zero
    > xfeatures zero bit means the end
    >
    > The current xstate code in setup_xstate_features() assumes that the first
    > zero bit means the end of xfeatures - but that is not so, the SDM clearly
    > states that an arbitrary set of xfeatures might be enabled - and it is also clear
    > from the description of the compaction feature that holes are possible:

    A previous patch in lkml has (exactly) the same fix:
    http://lists-archives.com/linux-kernel/28292115-x86-xsave-c-fix-xstate-offsets-and-sizes-enumeration.html

    Thanks.

    -Fenghua


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