• Dave Hansen's avatar
    x86/fpu: Rename XSAVE macros · d91cab78
    Dave Hansen authored
    There are two concepts that have some confusing naming:
     1. Extended State Component numbers (currently called
        XFEATURE_BIT_*)
     2. Extended State Component masks (currently called XSTATE_*)
    
    The numbers are (currently) from 0-9.  State component 3 is the
    bounds registers for MPX, for instance.
    
    But when we want to enable "state component 3", we go set a bit
    in XCR0.  The bit we set is 1<<3.  We can check to see if a
    state component feature is enabled by looking at its bit.
    
    The current 'xfeature_bit's are at best xfeature bit _numbers_.
    Calling them bits is at best inconsistent with ending the enum
    list with 'XFEATURES_NR_MAX'.
    
    This patch renames the enum to be 'xfeature'.  These also
    happen to be what the Intel documentation calls a "state
    component".
    
    We also want to differentiate these from the "XSTATE_*" macros.
    The "XSTATE_*" macros are a mask, and we rename them to match.
    
    These macros are reasonably widely used so this patch is a
    wee bit big, but this really is just a rename.
    
    The only non-mechanical part of this is the
    
    	s/XSTATE_EXTEND_MASK/XFEATURE_MASK_EXTEND/
    
    We need a better name for it, but that's another patch.
    Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tim Chen <tim.c.chen@linux.intel.com>
    Cc: dave@sr71.net
    Cc: linux-kernel@vger.kernel.org
    Link: http://lkml.kernel.org/r/20150902233126.38653250@viggo.jf.intel.com
    [ Ported to v4.3-rc1. ]
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    d91cab78
xstate.h 1.38 KB