From: Ingo Molnar <mingo@kernel.org>
Date: Thu, 30 Apr 2015 07:09:26 +0000 (+0200)
Subject: x86/alternatives, x86/fpu: Add 'alternatives_patched' debug flag and use it in xsave_... 
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~174^2~76
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e907bb0459399b0d1cc8d4c7e9f363a995b748a;p=pandora-kernel.git

x86/alternatives, x86/fpu: Add 'alternatives_patched' debug flag and use it in xsave_state()

We'd like to use xsave_state() earlier, but its SYSTEM_BOOTING check
is too imprecise.

The real condition that xsave_state() would like to check is whether
alternative XSAVE instructions were patched into the kernel image
already.

Add such a (read-mostly) debug flag and use it in xsave_state().

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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