[PATCH v5 1/5] x86/xsave: Move xsave initialization to after parsing early parameters

Andi Kleen
2017-08-17T15:44:13Z

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@linux.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 c8b39870f33e..60b7aa6330ed 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -885,7 +885,6 @@ 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 3486d0498800..2fba421d6b07 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -91,6 +91,7 @@
#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>
@@ -982,6 +983,8 @@ 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
--
2.9.4