Merge branch 'core/percpu' into stackprotector

[safe/jmp/linux-2.6] / arch / x86 / kernel / process_64.c

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index e00c31a..aa89eab 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -16,6 +16,7 @@
 
 #include <stdarg.h>
 
+#include <linux/stackprotector.h>
 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
@@ -60,6 +61,9 @@ asmlinkage extern void ret_from_fork(void);
 DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
 EXPORT_PER_CPU_SYMBOL(current_task);
 
+DEFINE_PER_CPU(unsigned long, old_rsp);
+static DEFINE_PER_CPU(unsigned char, is_idle);
+
 unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
 
 static ATOMIC_NOTIFIER_HEAD(idle_notifier);
@@ -78,13 +82,13 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);
 
 void enter_idle(void)
 {
-       write_pda(isidle, 1);
+       percpu_write(is_idle, 1);
        atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
 }
 
 static void __exit_idle(void)
 {
-       if (test_and_clear_bit_pda(0, isidle) == 0)
+       if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
                return;
        atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
 }
@@ -114,6 +118,17 @@ static inline void play_dead(void)
 void cpu_idle(void)
 {
        current_thread_info()->status |= TS_POLLING;
+
+       /*
+        * If we're the non-boot CPU, nothing set the PDA stack
+        * canary up for us - and if we are the boot CPU we have
+        * a 0 stack canary. This is a good place for updating
+        * it, as we wont ever return from this function (so the
+        * invalid canaries already on the stack wont ever
+        * trigger):
+        */
+       boot_init_stack_canary();
+
        /* endless idle loop with no priority at all */
        while (1) {
                tick_nohz_stop_sched_tick(1);
@@ -395,7 +410,7 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
        load_gs_index(0);
        regs->ip                = new_ip;
        regs->sp                = new_sp;
-       write_pda(oldrsp, new_sp);
+       percpu_write(old_rsp, new_sp);
        regs->cs                = __USER_CS;
        regs->ss                = __USER_DS;
        regs->flags             = 0x200;
@@ -616,15 +631,14 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
        /*
         * Switch the PDA and FPU contexts.
         */
-       prev->usersp = read_pda(oldrsp);
-       write_pda(oldrsp, next->usersp);
+       prev->usersp = percpu_read(old_rsp);
+       percpu_write(old_rsp, next->usersp);
        percpu_write(current_task, next_p);
 
-       write_pda(kernelstack,
+       percpu_write(kernel_stack,
                  (unsigned long)task_stack_page(next_p) +
-                 THREAD_SIZE - PDA_STACKOFFSET);
+                 THREAD_SIZE - KERNEL_STACK_OFFSET);
 #ifdef CONFIG_CC_STACKPROTECTOR
-       write_pda(stack_canary, next_p->stack_canary);
        /*
         * Build time only check to make sure the stack_canary is at
         * offset 40 in the pda; this is a gcc ABI requirement