linux-kernel - [tip:x86/bsp-hotplug] x86/i387.c: Initialize thread xstate only on CPU0 only once

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Message-ID: <tip-63a0bb0477012ed0f5c9e5658d0c7f08c291525c@git.kernel.org>
Date:	Mon, 27 Aug 2012 10:16:29 -0700
From:	tip-bot for Fenghua Yu <fenghua.yu@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	fenghua.yu@...el.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/bsp-hotplug] x86/i387.c:
  Initialize thread xstate only on CPU0 only once

Commit-ID:  63a0bb0477012ed0f5c9e5658d0c7f08c291525c
Gitweb:     http://git.kernel.org/tip/63a0bb0477012ed0f5c9e5658d0c7f08c291525c
Author:     Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Sat, 25 Aug 2012 10:41:27 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Sat, 25 Aug 2012 19:26:36 -0700

x86/i387.c: Initialize thread xstate only on CPU0 only once

init_thread_xstate() is only called once to avoid overriding xstate_size during
boot time or during CPU hotplug.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Link: http://lkml.kernel.org/r/1345916488-8355-12-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/i387.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index f250431..e4c3a21 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -188,7 +188,11 @@ void __cpuinit fpu_init(void)
 		cr0 |= X86_CR0_EM;
 	write_cr0(cr0);
 
-	if (!smp_processor_id())
+	/*
+	 * init_thread_xstate is only called once to avoid overriding
+	 * xstate_size during boot time or during CPU hotplug.
+	 */
+	if (xstate_size == 0)
 		init_thread_xstate();
 
 	mxcsr_feature_mask_init();
--
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