[PATCH v9 34/36] x86/syscall: Split IDT syscall setup code into idt_syscall_init()

[Xin Li <xin3.li@xxxxxxxxx>]

Split IDT syscall setup code into idt_syscall_init() to make it
cleaner to add FRED syscall setup code.

Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
---
 arch/x86/kernel/cpu/common.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 331b06d19f7f..bb03dacc5fb8 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2027,10 +2027,8 @@ static void wrmsrl_cstar(unsigned long val)
                wrmsrl(MSR_CSTAR, val);
 }
 
-/* May not be marked __init: used by software suspend */
-void syscall_init(void)
+static inline void idt_syscall_init(void)
 {
-       wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);
        wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64);
 
 #ifdef CONFIG_IA32_EMULATION
@@ -2064,6 +2062,15 @@ void syscall_init(void)
               X86_EFLAGS_AC|X86_EFLAGS_ID);
 }
 
+/* May not be marked __init: used by software suspend */
+void syscall_init(void)
+{
+       /* The default user and kernel segments */
+       wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);
+
+       idt_syscall_init();
+}
+
 #else  /* CONFIG_X86_64 */
 
 #ifdef CONFIG_STACKPROTECTOR
-- 
2.34.1