Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (30 commits)
  [S390] wire up sys_perf_counter_open
  [S390] wire up sys_rt_tgsigqueueinfo
  [S390] ftrace: add system call tracer support
  [S390] ftrace: add function graph tracer support
  [S390] ftrace: add function trace mcount test support
  [S390] ftrace: add dynamic ftrace support
  [S390] kprobes: use probe_kernel_write
  [S390] maccess: arch specific probe_kernel_write() implementation
  [S390] maccess: add weak attribute to probe_kernel_write
  [S390] profile_tick called twice
  [S390] dasd: forward internal errors to dasd_sleep_on caller
  [S390] dasd: sync after async probe
  [S390] dasd: check_characteristics cleanup
  [S390] dasd: no High Performance FICON in 31-bit mode
  [S390] dcssblk: revert devt conversion
  [S390] qdio: fix access beyond ARRAY_SIZE of irq_ptr->{in,out}put_qs
  [S390] vmalloc: add vmalloc kernel parameter support
  [S390] uaccess: use might_fault() instead of might_sleep()
  [S390] 3270: lock dependency fixes
  [S390] 3270: do not register with tty_register_device
  ...

arch/s390/Kconfig

@@ -82,6 +82,11 @@ config S390
 	select USE_GENERIC_SMP_HELPERS if SMP
 	select HAVE_SYSCALL_WRAPPERS
 	select HAVE_FUNCTION_TRACER
+	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
+	select HAVE_FTRACE_MCOUNT_RECORD
+	select HAVE_FTRACE_SYSCALLS
+	select HAVE_DYNAMIC_FTRACE
+	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_DEFAULT_NO_SPIN_MUTEXES
 	select HAVE_OPROFILE
 	select HAVE_KPROBES
@@ -567,6 +572,24 @@ bool "s390 guest support for KVM (EXPERIMENTAL)"
 	  the KVM hypervisor. This will add detection for KVM as well  as a
 	  virtio transport. If KVM is detected, the virtio console will be
 	  the default console.
+
+config SECCOMP
+	bool "Enable seccomp to safely compute untrusted bytecode"
+	depends on PROC_FS
+	default y
+	help
+	  This kernel feature is useful for number crunching applications
+	  that may need to compute untrusted bytecode during their
+	  execution. By using pipes or other transports made available to
+	  the process as file descriptors supporting the read/write
+	  syscalls, it's possible to isolate those applications in
+	  their own address space using seccomp. Once seccomp is
+	  enabled via /proc/<pid>/seccomp, it cannot be disabled
+	  and the task is only allowed to execute a few safe syscalls
+	  defined by each seccomp mode.
+
+	  If unsure, say Y.
+
 endmenu
 
 source "net/Kconfig"

arch/s390/include/asm/compat.h

@@ -5,6 +5,7 @@
  */
 #include <linux/types.h>
 #include <linux/sched.h>
+#include <linux/thread_info.h>
 
 #define PSW32_MASK_PER		0x40000000UL
 #define PSW32_MASK_DAT		0x04000000UL
@@ -163,12 +164,28 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 	return (u32)(unsigned long)uptr;
 }
 
+#ifdef CONFIG_COMPAT
+
+static inline int is_compat_task(void)
+{
+	return test_thread_flag(TIF_31BIT);
+}
+
+#else
+
+static inline int is_compat_task(void)
+{
+	return 0;
+}
+
+#endif
+
 static inline void __user *compat_alloc_user_space(long len)
 {
 	unsigned long stack;
 
 	stack = KSTK_ESP(current);
-	if (test_thread_flag(TIF_31BIT))
+	if (is_compat_task())
 		stack &= 0x7fffffffUL;
 	return (void __user *) (stack - len);
 }

arch/s390/include/asm/cputime.h

@@ -9,6 +9,9 @@
 #ifndef _S390_CPUTIME_H
 #define _S390_CPUTIME_H
 
+#include <linux/types.h>
+#include <linux/percpu.h>
+#include <linux/spinlock.h>
 #include <asm/div64.h>
 
 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
@@ -174,8 +177,24 @@ cputime64_to_clock_t(cputime64_t cputime)
        return __div(cputime, 4096000000ULL / USER_HZ);
 }
 
+struct s390_idle_data {
+	spinlock_t lock;
+	unsigned long long idle_count;
+	unsigned long long idle_enter;
+	unsigned long long idle_time;
+};
+
+DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
+
+void vtime_start_cpu(void);
 cputime64_t s390_get_idle_time(int cpu);
 
 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
 
+static inline void s390_idle_check(void)
+{
+	if ((&__get_cpu_var(s390_idle))->idle_enter != 0ULL)
+		vtime_start_cpu();
+}
+
 #endif /* _S390_CPUTIME_H */

arch/s390/include/asm/ftrace.h

@@ -2,7 +2,28 @@
 #define _ASM_S390_FTRACE_H
 
 #ifndef __ASSEMBLY__
+
 extern void _mcount(void);
+extern unsigned long ftrace_dyn_func;
+
+struct dyn_arch_ftrace { };
+
+#define MCOUNT_ADDR ((long)_mcount)
+
+#ifdef CONFIG_64BIT
+#define MCOUNT_OFFSET_RET 18
+#define MCOUNT_INSN_SIZE  24
+#define MCOUNT_OFFSET	  14
+#else
+#define MCOUNT_OFFSET_RET 26
+#define MCOUNT_INSN_SIZE  30
+#define MCOUNT_OFFSET	   8
 #endif
 
+static inline unsigned long ftrace_call_adjust(unsigned long addr)
+{
+	return addr - MCOUNT_OFFSET;
+}
+
+#endif /* __ASSEMBLY__ */
 #endif /* _ASM_S390_FTRACE_H */

arch/s390/include/asm/lowcore.h

@@ -30,6 +30,7 @@
 #define __LC_SUBCHANNEL_NR		0x00ba
 #define __LC_IO_INT_PARM		0x00bc
 #define __LC_IO_INT_WORD		0x00c0
+#define __LC_STFL_FAC_LIST		0x00c8
 #define __LC_MCCK_CODE			0x00e8
 
 #define __LC_DUMP_REIPL			0x0e00
@@ -67,6 +68,7 @@
 #define __LC_CPUID			0x02b0
 #define __LC_INT_CLOCK			0x02c8
 #define __LC_MACHINE_FLAGS		0x02d8
+#define __LC_FTRACE_FUNC		0x02dc
 #define __LC_IRB			0x0300
 #define __LC_PFAULT_INTPARM		0x0080
 #define __LC_CPU_TIMER_SAVE_AREA	0x00d8
@@ -112,6 +114,7 @@
 #define __LC_INT_CLOCK			0x0340
 #define __LC_VDSO_PER_CPU		0x0350
 #define __LC_MACHINE_FLAGS		0x0358
+#define __LC_FTRACE_FUNC		0x0360
 #define __LC_IRB			0x0380
 #define __LC_PASTE			0x03c0
 #define __LC_PFAULT_INTPARM		0x11b8
@@ -280,7 +283,8 @@ struct _lowcore
 	__u64	int_clock;			/* 0x02c8 */
 	__u64	clock_comparator;		/* 0x02d0 */
 	__u32	machine_flags;			/* 0x02d8 */
-	__u8	pad_0x02dc[0x0300-0x02dc];	/* 0x02dc */
+	__u32	ftrace_func;			/* 0x02dc */
+	__u8	pad_0x02f0[0x0300-0x02f0];	/* 0x02f0 */
 
 	/* Interrupt response block */
 	__u8	irb[64];			/* 0x0300 */
@@ -385,7 +389,8 @@ struct _lowcore
 	__u64	clock_comparator;		/* 0x0348 */
 	__u64	vdso_per_cpu_data;		/* 0x0350 */
 	__u64	machine_flags;			/* 0x0358 */
-	__u8	pad_0x0360[0x0380-0x0360];	/* 0x0360 */
+	__u64	ftrace_func;			/* 0x0360 */
+	__u8	pad_0x0368[0x0380-0x0368];	/* 0x0368 */
 
 	/* Interrupt response block. */
 	__u8	irb[64];			/* 0x0380 */

arch/s390/include/asm/pgtable.h

@@ -112,12 +112,15 @@ extern char empty_zero_page[PAGE_SIZE];
  * effect, this also makes sure that 64 bit module code cannot be used
  * as system call address.
  */
+
+extern unsigned long VMALLOC_START;
+
 #ifndef __s390x__
-#define VMALLOC_START	0x78000000UL
+#define VMALLOC_SIZE	(96UL << 20)
 #define VMALLOC_END	0x7e000000UL
 #define VMEM_MAP_END	0x80000000UL
 #else /* __s390x__ */
-#define VMALLOC_START	0x3e000000000UL
+#define VMALLOC_SIZE	(1UL << 30)
 #define VMALLOC_END	0x3e040000000UL
 #define VMEM_MAP_END	0x40000000000UL
 #endif /* __s390x__ */

arch/s390/include/asm/seccomp.h

@@ -0,0 +1,16 @@
+#ifndef _ASM_S390_SECCOMP_H
+#define _ASM_S390_SECCOMP_H
+
+#include <linux/unistd.h>
+
+#define __NR_seccomp_read	__NR_read
+#define __NR_seccomp_write	__NR_write
+#define __NR_seccomp_exit	__NR_exit
+#define __NR_seccomp_sigreturn	__NR_sigreturn
+
+#define __NR_seccomp_read_32	__NR_read
+#define __NR_seccomp_write_32	__NR_write
+#define __NR_seccomp_exit_32	__NR_exit
+#define __NR_seccomp_sigreturn_32 __NR_sigreturn
+
+#endif	/* _ASM_S390_SECCOMP_H */

arch/s390/include/asm/spinlock.h

@@ -122,8 +122,10 @@ static inline void __raw_spin_unlock(raw_spinlock_t *lp)
 #define __raw_write_can_lock(x) ((x)->lock == 0)
 
 extern void _raw_read_lock_wait(raw_rwlock_t *lp);
+extern void _raw_read_lock_wait_flags(raw_rwlock_t *lp, unsigned long flags);
 extern int _raw_read_trylock_retry(raw_rwlock_t *lp);
 extern void _raw_write_lock_wait(raw_rwlock_t *lp);
+extern void _raw_write_lock_wait_flags(raw_rwlock_t *lp, unsigned long flags);
 extern int _raw_write_trylock_retry(raw_rwlock_t *lp);
 
 static inline void __raw_read_lock(raw_rwlock_t *rw)
@@ -134,6 +136,14 @@ static inline void __raw_read_lock(raw_rwlock_t *rw)
 		_raw_read_lock_wait(rw);
 }
 
+static inline void __raw_read_lock_flags(raw_rwlock_t *rw, unsigned long flags)
+{
+	unsigned int old;
+	old = rw->lock & 0x7fffffffU;
+	if (_raw_compare_and_swap(&rw->lock, old, old + 1) != old)
+		_raw_read_lock_wait_flags(rw, flags);
+}
+
 static inline void __raw_read_unlock(raw_rwlock_t *rw)
 {
 	unsigned int old, cmp;
@@ -151,6 +161,12 @@ static inline void __raw_write_lock(raw_rwlock_t *rw)
 		_raw_write_lock_wait(rw);
 }
 
+static inline void __raw_write_lock_flags(raw_rwlock_t *rw, unsigned long flags)
+{
+	if (unlikely(_raw_compare_and_swap(&rw->lock, 0, 0x80000000) != 0))
+		_raw_write_lock_wait_flags(rw, flags);
+}
+
 static inline void __raw_write_unlock(raw_rwlock_t *rw)
 {
 	_raw_compare_and_swap(&rw->lock, 0x80000000, 0);
@@ -172,9 +188,6 @@ static inline int __raw_write_trylock(raw_rwlock_t *rw)
 	return _raw_write_trylock_retry(rw);
 }
 
-#define __raw_read_lock_flags(lock, flags) __raw_read_lock(lock)
-#define __raw_write_lock_flags(lock, flags) __raw_write_lock(lock)
-
 #define _raw_read_relax(lock)	cpu_relax()
 #define _raw_write_relax(lock)	cpu_relax()
 

arch/s390/include/asm/syscall.h

@@ -12,6 +12,7 @@
 #ifndef _ASM_SYSCALL_H
 #define _ASM_SYSCALL_H	1
 
+#include <linux/sched.h>
 #include <asm/ptrace.h>
 
 static inline long syscall_get_nr(struct task_struct *task,

arch/s390/include/asm/thread_info.h

@@ -83,14 +83,16 @@ static inline struct thread_info *current_thread_info(void)
 /*
  * thread information flags bit numbers
  */
-#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 #define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_RESTART_SVC		4	/* restart svc with new svc number */
-#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
 #define TIF_SINGLE_STEP		6	/* deliver sigtrap on return to user */
 #define TIF_MCCK_PENDING	7	/* machine check handling is pending */
+#define TIF_SYSCALL_TRACE	8	/* syscall trace active */
+#define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
+#define TIF_SECCOMP		10	/* secure computing */
+#define TIF_SYSCALL_FTRACE	11	/* ftrace syscall instrumentation */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
 #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling 
 					   TIF_NEED_RESCHED */
@@ -99,15 +101,17 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_RESTORE_SIGMASK	20	/* restore signal mask in do_signal() */
 #define TIF_FREEZE		21	/* thread is freezing for suspend */
 
-#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_RESTART_SVC	(1<<TIF_RESTART_SVC)
-#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SINGLE_STEP	(1<<TIF_SINGLE_STEP)
 #define _TIF_MCCK_PENDING	(1<<TIF_MCCK_PENDING)
+#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
+#define _TIF_SYSCALL_FTRACE	(1<<TIF_SYSCALL_FTRACE)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_31BIT		(1<<TIF_31BIT)