diff options
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 31 |
1 files changed, 10 insertions, 21 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index d79f139871e0..66d62aef7214 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -959,24 +959,6 @@ static void identify_cpu(struct cpuinfo_x86 *c) #endif } -#ifdef CONFIG_X86_64 -# ifdef CONFIG_IA32_EMULATION -/* May not be __init: called during resume */ -static void syscall32_cpu_init(void) -{ - /* - * Always load these, in case some future 64-bit CPU supports - * SYSENTER from compat mode too: - */ - wrmsrl_safe(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS); - wrmsrl_safe(MSR_IA32_SYSENTER_ESP, 0ULL); - wrmsrl_safe(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target); - - wrmsrl(MSR_CSTAR, ia32_cstar_target); -} -# endif -#endif - /* * Set up the CPU state needed to execute SYSENTER/SYSEXIT instructions * on 32-bit kernels: @@ -1187,10 +1169,17 @@ void syscall_init(void) */ wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32); wrmsrl(MSR_LSTAR, system_call); +#ifndef CONFIG_IA32_EMULATION wrmsrl(MSR_CSTAR, ignore_sysret); - -#ifdef CONFIG_IA32_EMULATION - syscall32_cpu_init(); +#else + wrmsrl(MSR_CSTAR, ia32_cstar_target); + /* + * Always load these, in case some future 64-bit CPU supports + * SYSENTER from compat mode too: + */ + wrmsrl_safe(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS); + wrmsrl_safe(MSR_IA32_SYSENTER_ESP, 0ULL); + wrmsrl_safe(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target); #endif /* Flags to clear on syscall */ |