From: Ingo Molnar <mingo@kernel.org>
Date: Fri, 1 May 2015 07:59:04 +0000 (+0200)
Subject: x86/fpu: Change fpu->fpregs_active from 'int' to 'char', add lazy switching comments
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~203^2~55
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aeb997b9f2a2199c72b89b7a304cafc394e4202b;p=pandora-kernel.git

x86/fpu: Change fpu->fpregs_active from 'int' to 'char', add lazy switching comments

Improve the memory layout of 'struct fpu':

 - change ->fpregs_active from 'int' to 'char' - it's just a single flag
   and modern x86 CPUs can do efficient byte accesses.

 - pack related fields closer to each other: often 'fpu->state' will not be
   touched, while the other fields will - so pack them into a group.

Also add comments to each field, describing their purpose, and add
some background information about lazy restores.

Also fix an obsolete, lazy switching related comment in fpu_copy()'s description.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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