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authorLi Shaohua <shaohua.li@intel.com>2005-06-25 14:54:53 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:29 -0700
commit6fe940d6c300886de4ff1454d8ffd363172af433 (patch)
tree58c34aed66a85ff72bdba1d5e3a3e3c967621a04 /arch/i386/kernel/sysenter.c
parent67664c8f7e74def5adf66298a1245d82af72db2c (diff)
downloadop-kernel-dev-6fe940d6c300886de4ff1454d8ffd363172af433.zip
op-kernel-dev-6fe940d6c300886de4ff1454d8ffd363172af433.tar.gz
[PATCH] sep initializing rework
Make SEP init per-cpu, so it is hotplug safe. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/sysenter.c')
-rw-r--r--arch/i386/kernel/sysenter.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c
index 960d8bd..0bada18 100644
--- a/arch/i386/kernel/sysenter.c
+++ b/arch/i386/kernel/sysenter.c
@@ -21,11 +21,16 @@
extern asmlinkage void sysenter_entry(void);
-void enable_sep_cpu(void *info)
+void enable_sep_cpu(void)
{
int cpu = get_cpu();
struct tss_struct *tss = &per_cpu(init_tss, cpu);
+ if (!boot_cpu_has(X86_FEATURE_SEP)) {
+ put_cpu();
+ return;
+ }
+
tss->ss1 = __KERNEL_CS;
tss->esp1 = sizeof(struct tss_struct) + (unsigned long) tss;
wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0);
@@ -41,7 +46,7 @@ void enable_sep_cpu(void *info)
extern const char vsyscall_int80_start, vsyscall_int80_end;
extern const char vsyscall_sysenter_start, vsyscall_sysenter_end;
-static int __init sysenter_setup(void)
+int __init sysenter_setup(void)
{
void *page = (void *)get_zeroed_page(GFP_ATOMIC);
@@ -58,8 +63,5 @@ static int __init sysenter_setup(void)
&vsyscall_sysenter_start,
&vsyscall_sysenter_end - &vsyscall_sysenter_start);
- on_each_cpu(enable_sep_cpu, NULL, 1, 1);
return 0;
}
-
-__initcall(sysenter_setup);
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