Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 update from Martin Schwidefsky:
 "An additional sysfs attribute for channel paths and a couple of bux
  fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pgtable: fix ipte notify bit
  s390/xpram: mark xpram as non-rotational
  s390/smp: fix cpu re-scan vs. cpu state
  s390/cio: add channel ID sysfs attribute
  s390/ftrace: fix mcount adjustment
  s390: fix gmap_ipte_notifier vs. software dirty pages
  s390: disable pfmf for clear page instruction
  s390/disassembler: prevent endless loop in print_fn_code()
  s390: remove non existent reference to GENERIC_KERNEL_THREAD

10 files changed, 27 insertions, 30 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 2c9789da0e24..da183c5a103c 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -98,7 +98,6 @@ config S390
 	select CLONE_BACKWARDS2
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_CPU_DEVICES if !SMP
-	select GENERIC_KERNEL_THREAD
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL_OLD
 	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h
index b7931faaef6d..bf246dae1367 100644
--- a/arch/s390/include/asm/ftrace.h
+++ b/arch/s390/include/asm/ftrace.h
@@ -9,11 +9,6 @@ struct dyn_arch_ftrace { };
 
 #define MCOUNT_ADDR ((long)_mcount)
 
-#ifdef CONFIG_64BIT
-#define MCOUNT_INSN_SIZE  12
-#else
-#define MCOUNT_INSN_SIZE  20
-#endif
 
 static inline unsigned long ftrace_call_adjust(unsigned long addr)
 {
@@ -21,4 +16,11 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
 }
 
 #endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_64BIT
+#define MCOUNT_INSN_SIZE  12
+#else
+#define MCOUNT_INSN_SIZE  22
+#endif
+
 #endif /* _ASM_S390_FTRACE_H */
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 75ce9b065f9f..5d64fb7619cc 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -32,7 +32,7 @@
 
 void storage_key_init_range(unsigned long start, unsigned long end);
 
-static unsigned long pfmf(unsigned long function, unsigned long address)
+static inline unsigned long pfmf(unsigned long function, unsigned long address)
 {
 	asm volatile(
 		"	.insn	rre,0xb9af0000,%[function],%[address]"
@@ -44,17 +44,13 @@ static unsigned long pfmf(unsigned long function, unsigned long address)
 
 static inline void clear_page(void *page)
 {
-	if (MACHINE_HAS_PFMF) {
-		pfmf(0x10000, (unsigned long)page);
-	} else {
-		register unsigned long reg1 asm ("1") = 0;
-		register void *reg2 asm ("2") = page;
-		register unsigned long reg3 asm ("3") = 4096;
-		asm volatile(
-			"	mvcl	2,0"
-			: "+d" (reg2), "+d" (reg3) : "d" (reg1)
-			: "memory", "cc");
-	}
+	register unsigned long reg1 asm ("1") = 0;
+	register void *reg2 asm ("2") = page;
+	register unsigned long reg3 asm ("3") = 4096;
+	asm volatile(
+		"	mvcl	2,0"
+		: "+d" (reg2), "+d" (reg3) : "d" (reg1)
+		: "memory", "cc");
 }
 
 static inline void copy_page(void *to, void *from)
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 4105b8221fdd..0f0de30e3e3f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -306,7 +306,7 @@ extern unsigned long MODULES_END;
 #define RCP_HC_BIT	0x00200000UL
 #define RCP_GR_BIT	0x00040000UL
 #define RCP_GC_BIT	0x00020000UL
-#define RCP_IN_BIT	0x00008000UL	/* IPTE notify bit */
+#define RCP_IN_BIT	0x00002000UL	/* IPTE notify bit */
 
 /* User dirty / referenced bit for KVM's migration feature */
 #define KVM_UR_BIT	0x00008000UL
@@ -374,7 +374,7 @@ extern unsigned long MODULES_END;
 #define RCP_HC_BIT	0x0020000000000000UL
 #define RCP_GR_BIT	0x0004000000000000UL
 #define RCP_GC_BIT	0x0002000000000000UL
-#define RCP_IN_BIT	0x0000800000000000UL	/* IPTE notify bit */
+#define RCP_IN_BIT	0x0000200000000000UL	/* IPTE notify bit */
 
 /* User dirty / referenced bit for KVM's migration feature */
 #define KVM_UR_BIT	0x0000800000000000UL
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index 7f4a4a8c847c..be87d3e05a5b 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -1862,6 +1862,8 @@ void print_fn_code(unsigned char *code, unsigned long len)
 	while (len) {
 		ptr = buffer;
 		opsize = insn_length(*code);
+		if (opsize > len)
+			break;
 		ptr += sprintf(ptr, "%p: ", code);
 		for (i = 0; i < opsize; i++)
 			ptr += sprintf(ptr, "%02x", code[i]);
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 78bdf0e5dff7..e3043aef87a9 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -16,12 +16,6 @@
 #include <trace/syscall.h>
 #include <asm/asm-offsets.h>
 
-#ifdef CONFIG_64BIT
-#define MCOUNT_OFFSET_RET 12
-#else
-#define MCOUNT_OFFSET_RET 22
-#endif
-
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 void ftrace_disable_code(void);
@@ -155,9 +149,10 @@ unsigned long __kprobes prepare_ftrace_return(unsigned long parent,
 
 	if (unlikely(atomic_read(&current->tracing_graph_pause)))
 		goto out;
+	ip = (ip & PSW_ADDR_INSN) - MCOUNT_INSN_SIZE;
 	if (ftrace_push_return_trace(parent, ip, &trace.depth, 0) == -EBUSY)
 		goto out;
-	trace.func = (ip & PSW_ADDR_INSN) - MCOUNT_OFFSET_RET;
+	trace.func = ip;
 	/* Only trace if the calling function expects to. */
 	if (!ftrace_graph_entry(&trace)) {
 		current->curr_ret_stack--;
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index 4567ce20d900..08dcf21cb8df 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -7,6 +7,7 @@
 
 #include <linux/linkage.h>
 #include <asm/asm-offsets.h>
+#include <asm/ftrace.h>
 
 	.section .kprobes.text, "ax"
 
@@ -33,6 +34,7 @@ ENTRY(ftrace_caller)
 	la	%r2,0(%r14)
 	st	%r0,__SF_BACKCHAIN(%r15)
 	la	%r3,0(%r3)
+	ahi	%r2,-MCOUNT_INSN_SIZE
 	l	%r14,0b-0b(%r1)
 	l	%r14,0(%r14)
 	basr	%r14,%r14
diff --git a/arch/s390/kernel/mcount64.S b/arch/s390/kernel/mcount64.S
index 11332193db30..1c52eae3396a 100644
--- a/arch/s390/kernel/mcount64.S
+++ b/arch/s390/kernel/mcount64.S
@@ -7,6 +7,7 @@
 
 #include <linux/linkage.h>
 #include <asm/asm-offsets.h>
+#include <asm/ftrace.h>
 
 	.section .kprobes.text, "ax"
 
@@ -29,6 +30,7 @@ ENTRY(ftrace_caller)
 	stg	%r1,__SF_BACKCHAIN(%r15)
 	lgr	%r2,%r14
 	lg	%r3,168(%r15)
+	aghi	%r2,-MCOUNT_INSN_SIZE
 	larl	%r14,ftrace_trace_function
 	lg	%r14,0(%r14)
 	basr	%r14,%r14
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 8074cb4b7cbf..05674b669001 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -645,7 +645,7 @@ static int __cpuinit __smp_rescan_cpus(struct sclp_cpu_info *info,
 			continue;
 		pcpu = pcpu_devices + cpu;
 		pcpu->address = info->cpu[i].address;
-		pcpu->state = (cpu >= info->configured) ?
+		pcpu->state = (i >= info->configured) ?
 			CPU_STATE_STANDBY : CPU_STATE_CONFIGURED;
 		smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
 		set_cpu_present(cpu, true);
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 7805ddca833d..18dc417aaf79 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -677,8 +677,7 @@ int gmap_ipte_notify(struct gmap *gmap, unsigned long start, unsigned long len)
 			break;
 		}
 		/* Get the page mapped */
-		if (get_user_pages(current, gmap->mm, addr, 1, 1, 0,
-				   NULL, NULL) != 1) {
+		if (fixup_user_fault(current, gmap->mm, addr, FAULT_FLAG_WRITE)) {
 			rc = -EFAULT;
 			break;
 		}