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| author | Li Shaohua <shaohua.li@intel.com> | 2005-06-25 14:54:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-25 16:24:29 -0700 |
| commit | 6fe940d6c300886de4ff1454d8ffd363172af433 (patch) | |
| tree | 58c34aed66a85ff72bdba1d5e3a3e3c967621a04 /arch/i386/kernel/sysenter.c | |
| parent | 67664c8f7e74def5adf66298a1245d82af72db2c (diff) | |
| download | linux-6fe940d6c300886de4ff1454d8ffd363172af433.tar.gz linux-6fe940d6c300886de4ff1454d8ffd363172af433.tar.bz2 linux-6fe940d6c300886de4ff1454d8ffd363172af433.zip | |
[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.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c index 960d8bd137d0..0bada1870bdf 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); |