[S390] add kprobes annotations

Add kprobes annotations to get the massive 'probe kernel.function("*") {}'
stress test working.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

8 files changed, 26 insertions, 9 deletions

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1ecc337fb679..68d1a02db6be 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -188,6 +188,8 @@ STACK_SIZE  = 1 << STACK_SHIFT
         ssm     __SF_EMPTY(%r15)
         .endm
 
+        .section .kprobes.text, "ax"
+
 /*
  * Scheduler resume function, called by switch_to
  *  gpr2 = (task_struct *) prev
@@ -861,6 +863,8 @@ restart_crash:
 restart_go:
 #endif
 
+        .section .kprobes.text, "ax"
+
 #ifdef CONFIG_CHECK_STACK
 /*
  * The synchronous or the asynchronous stack overflowed. We are dead.
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 8f3e802174db..1c0dce58933a 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -197,6 +197,8 @@ _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
         ssm     __SF_EMPTY(%r15)
         .endm
 
+        .section .kprobes.text, "ax"
+
 /*
  * Scheduler resume function, called by switch_to
  *  gpr2 = (task_struct *) prev
@@ -868,6 +870,8 @@ restart_crash:
 restart_go:
 #endif
 
+        .section .kprobes.text, "ax"
+
 #ifdef CONFIG_CHECK_STACK
 /*
  * The synchronous or the asynchronous stack overflowed. We are dead.
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index dfe015d7398c..4a6e1a575f9e 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -7,6 +7,8 @@
 
 #include <asm/asm-offsets.h>
 
+        .section .kprobes.text, "ax"
+
         .globl ftrace_stub
 ftrace_stub:
         br      %r14
diff --git a/arch/s390/kernel/mcount64.S b/arch/s390/kernel/mcount64.S
index c37211c6092b..b2bae06ad6c7 100644
--- a/arch/s390/kernel/mcount64.S
+++ b/arch/s390/kernel/mcount64.S
@@ -7,6 +7,8 @@
 
 #include <asm/asm-offsets.h>
 
+        .section .kprobes.text, "ax"
+
         .globl ftrace_stub
 ftrace_stub:
         br      %r14
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index ec2e03b22ead..b825b3e1cb17 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -32,6 +32,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/syscalls.h>
 #include <linux/compat.h>
+#include <linux/kprobes.h>
 #include <asm/compat.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -116,15 +117,17 @@ void cpu_idle(void)
         }
 }
 
-extern void kernel_thread_starter(void);
+extern void __kprobes kernel_thread_starter(void);
 
 asm(
-        ".align 4\n"
+        ".section .kprobes.text, \"ax\"\n"
+        ".global kernel_thread_starter\n"
         "kernel_thread_starter:\n"
         "    la    2,0(10)\n"
         "    basr  14,9\n"
         "    la    2,0\n"
-        "    br    11\n");
+        "    br    11\n"
+        ".previous\n");
 
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 {
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index f754a6dc4f94..4c9d72d2e273 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -37,6 +37,7 @@
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/gfp.h>
+#include <linux/kprobes.h>
 #include <asm/uaccess.h>
 #include <asm/delay.h>
 #include <asm/s390_ext.h>
@@ -60,7 +61,7 @@ static DEFINE_PER_CPU(struct clock_event_device, comparators);
 /*
  * Scheduler clock - returns current time in nanosec units.
  */
-unsigned long long notrace sched_clock(void)
+unsigned long long notrace __kprobes sched_clock(void)
 {
         return (get_clock_monotonic() * 125) >> 9;
 }
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 70640822621a..bc4f32fcfa57 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -451,8 +451,8 @@ static inline void do_fp_trap(struct pt_regs *regs, void __user *location,
                 "floating point exception", regs, &si);
 }
 
-static void illegal_op(struct pt_regs *regs, long pgm_int_code,
-                       unsigned long trans_exc_code)
+static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code,
+                                 unsigned long trans_exc_code)
 {
         siginfo_t info;
         __u8 opcode[6];
@@ -688,7 +688,7 @@ static void space_switch_exception(struct pt_regs *regs, long pgm_int_code,
         do_trap(pgm_int_code, SIGILL, "space switch event", regs, &info);
 }
 
-asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
+asmlinkage void __kprobes kernel_stack_overflow(struct pt_regs * regs)
 {
         bust_spinlocks(1);
         printk("Kernel stack overflow.\n");
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 7eff9b7347c0..8636dd00e393 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -20,6 +20,7 @@
 #include <linux/rcupdate.h>
 #include <linux/posix-timers.h>
 #include <linux/cpu.h>
+#include <linux/kprobes.h>
 
 #include <asm/s390_ext.h>
 #include <asm/timer.h>
@@ -122,7 +123,7 @@ void account_system_vtime(struct task_struct *tsk)
 }
 EXPORT_SYMBOL_GPL(account_system_vtime);
 
-void vtime_start_cpu(__u64 int_clock, __u64 enter_timer)
+void __kprobes vtime_start_cpu(__u64 int_clock, __u64 enter_timer)
 {
         struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
         struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
@@ -162,7 +163,7 @@ void vtime_start_cpu(__u64 int_clock, __u64 enter_timer)
         idle->sequence++;
 }
 
-void vtime_stop_cpu(void)
+void __kprobes vtime_stop_cpu(void)
 {
         struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
         struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);