linux-kernel - [PATCH v7 1/5] x86/xsave: Move xsave initialization to after parsing early parameters

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Message-Id: <20170919222620.3903-2-andi@firstfloor.org>
Date:   Tue, 19 Sep 2017 15:26:16 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     x86@...nel.org
Cc:     hpa@...or.com, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v7 1/5] x86/xsave: Move xsave initialization to after parsing early parameters

From: Andi Kleen <ak@...ux.intel.com>

Move the XSAVE initialization code to be after parsing early parameters.
I don't see any reason why the FPU code needs to be initialized that
early, nothing else in the initialization phase uses XSAVE.
This is useful to be able to handle command line parameters in the
XSAVE initialization code.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/cpu/common.c | 1 -
 arch/x86/kernel/setup.c      | 3 +++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 775f10100d7f..92480f3948ad 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -903,7 +903,6 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	}
 
 	setup_force_cpu_cap(X86_FEATURE_ALWAYS);
-	fpu__init_system(c);
 }
 
 void __init early_cpu_init(void)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0957dd73d127..2260e586295f 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -92,6 +92,7 @@
 #include <asm/processor.h>
 #include <asm/bugs.h>
 #include <asm/kasan.h>
+#include <asm/fpu/internal.h>
 
 #include <asm/vsyscall.h>
 #include <asm/cpu.h>
@@ -992,6 +993,8 @@ void __init setup_arch(char **cmdline_p)
 
 	parse_early_param();
 
+	fpu__init_system(&boot_cpu_data);
+
 #ifdef CONFIG_MEMORY_HOTPLUG
 	/*
 	 * Memory used by the kernel cannot be hot-removed because Linux
-- 
2.9.5