diff options
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 45 |
1 files changed, 37 insertions, 8 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 90930b28d2c..b88806c6624 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -4,7 +4,6 @@ * Copyright (C) 1991, 1992 Linus Torvalds */ -#include <linux/config.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/utsname.h> @@ -29,6 +28,7 @@ #include <linux/tty.h> #include <linux/signal.h> #include <linux/cn_proc.h> +#include <linux/getcpu.h> #include <linux/compat.h> #include <linux/syscalls.h> @@ -137,14 +137,15 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl, unsigned long val, void *v) { int ret = NOTIFY_DONE; - struct notifier_block *nb; + struct notifier_block *nb, *next_nb; nb = rcu_dereference(*nl); while (nb) { + next_nb = rcu_dereference(nb->next); ret = nb->notifier_call(nb, val, v); if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) break; - nb = rcu_dereference(nb->next); + nb = next_nb; } return ret; } @@ -588,7 +589,7 @@ void emergency_restart(void) } EXPORT_SYMBOL_GPL(emergency_restart); -void kernel_restart_prepare(char *cmd) +static void kernel_restart_prepare(char *cmd) { blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); system_state = SYSTEM_RESTART; @@ -611,7 +612,6 @@ void kernel_restart(char *cmd) } else { printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); } - printk(".\n"); machine_restart(cmd); } EXPORT_SYMBOL_GPL(kernel_restart); @@ -622,7 +622,7 @@ EXPORT_SYMBOL_GPL(kernel_restart); * Move into place and start executing a preloaded standalone * executable. If nothing was preloaded return an error. */ -void kernel_kexec(void) +static void kernel_kexec(void) { #ifdef CONFIG_KEXEC struct kimage *image; @@ -636,7 +636,6 @@ void kernel_kexec(void) machine_kexec(image); #endif } -EXPORT_SYMBOL_GPL(kernel_kexec); void kernel_shutdown_prepare(enum system_states state) { @@ -1984,7 +1983,7 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, error = current->mm->dumpable; break; case PR_SET_DUMPABLE: - if (arg2 < 0 || arg2 > 2) { + if (arg2 < 0 || arg2 > 1) { error = -EINVAL; break; } @@ -2063,3 +2062,33 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, } return error; } + +asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, + struct getcpu_cache __user *cache) +{ + int err = 0; + int cpu = raw_smp_processor_id(); + if (cpup) + err |= put_user(cpu, cpup); + if (nodep) + err |= put_user(cpu_to_node(cpu), nodep); + if (cache) { + /* + * The cache is not needed for this implementation, + * but make sure user programs pass something + * valid. vsyscall implementations can instead make + * good use of the cache. Only use t0 and t1 because + * these are available in both 32bit and 64bit ABI (no + * need for a compat_getcpu). 32bit has enough + * padding + */ + unsigned long t0, t1; + get_user(t0, &cache->blob[0]); + get_user(t1, &cache->blob[1]); + t0++; + t1++; + put_user(t0, &cache->blob[0]); + put_user(t1, &cache->blob[1]); + } + return err ? -EFAULT : 0; +} |