sysctl: remove "struct file *" argument of ->proc_handler

[safe/jmp/linux-2.6] / arch / x86 / kernel / vsyscall_64.c

diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index c4c5e76..8cb4974 100644 (file)
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -17,6 +17,9 @@
  *  want per guest time just set the kernel.vsyscall64 sysctl to 0.
  */
 
+/* Disable profiling for userspace code: */
+#define DISABLE_BRANCH_PROFILING
+
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -42,13 +45,9 @@
 #include <asm/topology.h>
 #include <asm/vgtod.h>
 
-#define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
+#define __vsyscall(nr) \
+               __attribute__ ((unused, __section__(".vsyscall_" #nr))) notrace
 #define __syscall_clobber "r11","cx","memory"
-#define __pa_vsymbol(x)                        \
-       ({unsigned long v;              \
-       extern char __vsyscall_0;       \
-         asm("" : "=r" (v) : "0" (x)); \
-         ((v - VSYSCALL_START) + __pa_symbol(&__vsyscall_0)); })
 
 /*
  * vsyscall_gtod_data contains data that is :
@@ -88,6 +87,7 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
        vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
        vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
        vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
+       vsyscall_gtod_data.wall_time_coarse = __current_kernel_time();
        write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
 }
 
@@ -102,7 +102,7 @@ static __always_inline void do_get_tz(struct timezone * tz)
 static __always_inline int gettimeofday(struct timeval *tv, struct timezone *tz)
 {
        int ret;
-       asm volatile("vsysc2: syscall"
+       asm volatile("syscall"
                : "=a" (ret)
                : "0" (__NR_gettimeofday),"D" (tv),"S" (tz)
                : __syscall_clobber );
@@ -112,7 +112,7 @@ static __always_inline int gettimeofday(struct timeval *tv, struct timezone *tz)
 static __always_inline long time_syscall(long *t)
 {
        long secs;
-       asm volatile("vsysc1: syscall"
+       asm volatile("syscall"
                : "=a" (secs)
                : "0" (__NR_time),"D" (t) : __syscall_clobber);
        return secs;
@@ -132,6 +132,7 @@ static __always_inline void do_vgettimeofday(struct timeval * tv)
                        gettimeofday(tv,NULL);
                        return;
                }
+
                now = vread();
                base = __vsyscall_gtod_data.clock.cycle_last;
                mask = __vsyscall_gtod_data.clock.mask;
@@ -221,56 +222,17 @@ vgetcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
        return 0;
 }
 
-long __vsyscall(3) venosys_1(void)
+static long __vsyscall(3) venosys_1(void)
 {
        return -ENOSYS;
 }
 
 #ifdef CONFIG_SYSCTL
-
-#define SYSCALL 0x050f
-#define NOP2    0x9090
-
-/*
- * NOP out syscall in vsyscall page when not needed.
- */
-static int vsyscall_sysctl_change(ctl_table *ctl, int write, struct file * filp,
-                        void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-       extern u16 vsysc1, vsysc2;
-       u16 __iomem *map1;
-       u16 __iomem *map2;
-       int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
-       if (!write)
-               return ret;
-       /* gcc has some trouble with __va(__pa()), so just do it this
-          way. */
-       map1 = ioremap(__pa_vsymbol(&vsysc1), 2);
-       if (!map1)
-               return -ENOMEM;
-       map2 = ioremap(__pa_vsymbol(&vsysc2), 2);
-       if (!map2) {
-               ret = -ENOMEM;
-               goto out;
-       }
-       if (!vsyscall_gtod_data.sysctl_enabled) {
-               writew(SYSCALL, map1);
-               writew(SYSCALL, map2);
-       } else {
-               writew(NOP2, map1);
-               writew(NOP2, map2);
-       }
-       iounmap(map2);
-out:
-       iounmap(map1);
-       return ret;
-}
-
 static ctl_table kernel_table2[] = {
        { .procname = "vsyscall64",
          .data = &vsyscall_gtod_data.sysctl_enabled, .maxlen = sizeof(int),
          .mode = 0644,
-         .proc_handler = vsyscall_sysctl_change },
+         .proc_handler = proc_dointvec },
        {}
 };
 
@@ -279,14 +241,13 @@ static ctl_table kernel_root_table2[] = {
          .child = kernel_table2 },
        {}
 };
-
 #endif
 
 /* 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 d;
        unsigned long node = 0;
 #ifdef CONFIG_NUMA
        node = cpu_to_node(cpu);
@@ -297,11 +258,11 @@ static void __cpuinit vsyscall_set_cpu(int cpu)
        /* Store cpu number in limit so that it can be loaded quickly
           in user space in vgetcpu.
           12 bits for the CPU and 8 bits for the node. */
-       d = (unsigned long *)(cpu_gdt(cpu) + GDT_ENTRY_PER_CPU);
-       *d = 0x0f40000000000ULL;
-       *d |= cpu;
-       *d |= (node & 0xf) << 12;
-       *d |= (node >> 4) << 48;
+       d = 0x0f40000000000ULL;
+       d |= cpu;
+       d |= (node & 0xf) << 12;
+       d |= (node >> 4) << 48;
+       write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S);
 }
 
 static void __cpuinit cpu_vsyscall_init(void *arg)
@@ -315,11 +276,11 @@ cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void *arg)
 {
        long cpu = (long)arg;
        if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN)
-               smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 0, 1);
+               smp_call_function_single(cpu, cpu_vsyscall_init, NULL, 1);
        return NOTIFY_DONE;
 }
 
-static void __init map_vsyscall(void)
+void __init map_vsyscall(void)
 {
        extern char __vsyscall_0;
        unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0);
@@ -335,11 +296,10 @@ static int __init vsyscall_init(void)
        BUG_ON((unsigned long) &vtime != VSYSCALL_ADDR(__NR_vtime));
        BUG_ON((VSYSCALL_ADDR(0) != __fix_to_virt(VSYSCALL_FIRST_PAGE)));
        BUG_ON((unsigned long) &vgetcpu != VSYSCALL_ADDR(__NR_vgetcpu));
-       map_vsyscall();
 #ifdef CONFIG_SYSCTL
        register_sysctl_table(kernel_root_table2);
 #endif
-       on_each_cpu(cpu_vsyscall_init, NULL, 0, 1);
+       on_each_cpu(cpu_vsyscall_init, NULL, 1);
        hotcpu_notifier(cpu_vsyscall_notifier, 0);
        return 0;
 }