Pull button into test branch

[linux-drm-fsl-dcu.git] / arch / x86_64 / kernel / vsyscall.c

diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index a98b460af6a1f600ebc2153490ecd4706700d08e..2433d6fc68b14faa4f51b9e841a0b1f9d755f3af 100644 (file)
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -27,6 +27,9 @@
 #include <linux/jiffies.h>
 #include <linux/sysctl.h>
 #include <linux/getcpu.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/notifier.h>
 
 #include <asm/vsyscall.h>
 #include <asm/pgtable.h>
@@ -39,6 +42,7 @@
 #include <asm/topology.h>
 
 #define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
+#define __syscall_clobber "r11","rcx","memory"
 
 int __sysctl_vsyscall __section_sysctl_vsyscall = 1;
 seqlock_t __xtime_lock __section_xtime_lock = SEQLOCK_UNLOCKED;
@@ -221,8 +225,7 @@ out:
 
 static int vsyscall_sysctl_nostrat(ctl_table *t, int __user *name, int nlen,
                                void __user *oldval, size_t __user *oldlenp,
-                               void __user *newval, size_t newlen,
-                               void **context)
+                               void __user *newval, size_t newlen)
 {
        return -ENOSYS;
 }
@@ -243,32 +246,17 @@ static ctl_table kernel_root_table2[] = {
 
 #endif
 
-static void __cpuinit write_rdtscp_cb(void *info)
-{
-       write_rdtscp_aux((unsigned long)info);
-}
-
-void __cpuinit vsyscall_set_cpu(int cpu)
+/* Assume __initcall executes before all user space. Hopefully kmod
+   doesn't violate that. We'll find out if it does. */
+static void __cpuinit vsyscall_set_cpu(int cpu)
 {
        unsigned long *d;
        unsigned long node = 0;
 #ifdef CONFIG_NUMA
        node = cpu_to_node[cpu];
 #endif
-       if (cpu_has(&cpu_data[cpu], X86_FEATURE_RDTSCP)) {
-               void *info = (void *)((node << 12) | cpu);
-               /* Can happen on preemptive kernel */
-               if (get_cpu() == cpu)
-                       write_rdtscp_cb(info);
-#ifdef CONFIG_SMP
-               else {
-                       /* the notifier is unfortunately not executed on the
-                          target CPU */
-                       smp_call_function_single(cpu,write_rdtscp_cb,info,0,1);
-               }
-#endif
-               put_cpu();
-       }
+       if (cpu_has(&cpu_data[cpu], X86_FEATURE_RDTSCP))
+               write_rdtscp_aux((node << 12) | cpu);
 
        /* Store cpu number in limit so that it can be loaded quickly
           in user space in vgetcpu.
@@ -280,11 +268,27 @@ void __cpuinit vsyscall_set_cpu(int cpu)
        *d |= (node >> 4) << 48;
 }
 
+static void __cpuinit cpu_vsyscall_init(void *arg)
+{
+       /* preemption should be already off */
+       vsyscall_set_cpu(raw_smp_processor_id());
+}
+
+static int __cpuinit
+cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void *arg)
+{
+       long cpu = (long)arg;
+       if (action == CPU_ONLINE)
+               smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 0, 1);
+       return NOTIFY_DONE;
+}
+
 static void __init map_vsyscall(void)
 {
        extern char __vsyscall_0;
        unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0);
 
+       /* Note that VSYSCALL_MAPPED_PAGES must agree with the code below. */
        __set_fixmap(VSYSCALL_FIRST_PAGE, physaddr_page0, PAGE_KERNEL_VSYSCALL);
 }
 
@@ -299,6 +303,8 @@ static int __init vsyscall_init(void)
 #ifdef CONFIG_SYSCTL
        register_sysctl_table(kernel_root_table2, 0);
 #endif
+       on_each_cpu(cpu_vsyscall_init, NULL, 0, 1);
+       hotcpu_notifier(cpu_vsyscall_notifier, 0);
        return 0;
 }