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

Pull s390 fixes from Martin Schwidefsky:
 "A couple of bug fixes for s390.

  The ftrace comile fix is quite large for a -rc6 release, but it would
  be nice to have it in 4.0"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/smp: reenable smt after resume
  s390/mm: limit STACK_RND_MASK for compat tasks
  s390/ftrace: fix compile error if CONFIG_KPROBES is disabled
  s390/cpum_sf: add diagnostic sampling event only if it is authorized

4 files changed, 62 insertions, 19 deletions

diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h
index c9df40b5c0ac..c9c875d9ed31 100644
--- a/arch/s390/include/asm/elf.h
+++ b/arch/s390/include/asm/elf.h
@@ -211,7 +211,7 @@ do {								\
 
 extern unsigned long mmap_rnd_mask;
 
-#define STACK_RND_MASK  (mmap_rnd_mask)
+#define STACK_RND_MASK  (test_thread_flag(TIF_31BIT) ? 0x7ff : mmap_rnd_mask)
 
 #define ARCH_DLINFO                                                         \
 do {                                                                        \
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 82c19899574f..6c79f1b44fe7 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -57,6 +57,44 @@
 
 unsigned long ftrace_plt;
 
+static inline void ftrace_generate_orig_insn(struct ftrace_insn *insn)
+{
+#ifdef CC_USING_HOTPATCH
+        /* brcl 0,0 */
+        insn->opc = 0xc004;
+        insn->disp = 0;
+#else
+        /* stg r14,8(r15) */
+        insn->opc = 0xe3e0;
+        insn->disp = 0xf0080024;
+#endif
+}
+
+static inline int is_kprobe_on_ftrace(struct ftrace_insn *insn)
+{
+#ifdef CONFIG_KPROBES
+        if (insn->opc == BREAKPOINT_INSTRUCTION)
+                return 1;
+#endif
+        return 0;
+}
+
+static inline void ftrace_generate_kprobe_nop_insn(struct ftrace_insn *insn)
+{
+#ifdef CONFIG_KPROBES
+        insn->opc = BREAKPOINT_INSTRUCTION;
+        insn->disp = KPROBE_ON_FTRACE_NOP;
+#endif
+}
+
+static inline void ftrace_generate_kprobe_call_insn(struct ftrace_insn *insn)
+{
+#ifdef CONFIG_KPROBES
+        insn->opc = BREAKPOINT_INSTRUCTION;
+        insn->disp = KPROBE_ON_FTRACE_CALL;
+#endif
+}
+
 int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
                        unsigned long addr)
 {
@@ -72,16 +110,9 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
                 return -EFAULT;
         if (addr == MCOUNT_ADDR) {
                 /* Initial code replacement */
-#ifdef CC_USING_HOTPATCH
-                /* We expect to see brcl 0,0 */
-                ftrace_generate_nop_insn(&orig);
-#else
-                /* We expect to see stg r14,8(r15) */
-                orig.opc = 0xe3e0;
-                orig.disp = 0xf0080024;
-#endif
+                ftrace_generate_orig_insn(&orig);
                 ftrace_generate_nop_insn(&new);
-        } else if (old.opc == BREAKPOINT_INSTRUCTION) {
+        } else if (is_kprobe_on_ftrace(&old)) {
                 /*
                  * If we find a breakpoint instruction, a kprobe has been
                  * placed at the beginning of the function. We write the
@@ -89,9 +120,8 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
                  * bytes of the original instruction so that the kprobes
                  * handler can execute a nop, if it reaches this breakpoint.
                  */
-                new.opc = orig.opc = BREAKPOINT_INSTRUCTION;
-                orig.disp = KPROBE_ON_FTRACE_CALL;
-                new.disp = KPROBE_ON_FTRACE_NOP;
+                ftrace_generate_kprobe_call_insn(&orig);
+                ftrace_generate_kprobe_nop_insn(&new);
         } else {
                 /* Replace ftrace call with a nop. */
                 ftrace_generate_call_insn(&orig, rec->ip);
@@ -111,7 +141,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
 
         if (probe_kernel_read(&old, (void *) rec->ip, sizeof(old)))
                 return -EFAULT;
-        if (old.opc == BREAKPOINT_INSTRUCTION) {
+        if (is_kprobe_on_ftrace(&old)) {
                 /*
                  * If we find a breakpoint instruction, a kprobe has been
                  * placed at the beginning of the function. We write the
@@ -119,9 +149,8 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
                  * bytes of the original instruction so that the kprobes
                  * handler can execute a brasl if it reaches this breakpoint.
                  */
-                new.opc = orig.opc = BREAKPOINT_INSTRUCTION;
-                orig.disp = KPROBE_ON_FTRACE_NOP;
-                new.disp = KPROBE_ON_FTRACE_CALL;
+                ftrace_generate_kprobe_nop_insn(&orig);
+                ftrace_generate_kprobe_call_insn(&new);
         } else {
                 /* Replace nop with an ftrace call. */
                 ftrace_generate_nop_insn(&orig);
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index c3f8d157cb0d..e6a1578fc000 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1415,7 +1415,7 @@ CPUMF_EVENT_ATTR(SF, SF_CYCLES_BASIC_DIAG, PERF_EVENT_CPUM_SF_DIAG);
 
 static struct attribute *cpumsf_pmu_events_attr[] = {
         CPUMF_EVENT_PTR(SF, SF_CYCLES_BASIC),
-        CPUMF_EVENT_PTR(SF, SF_CYCLES_BASIC_DIAG),
+        NULL,
         NULL,
 };
 
@@ -1606,8 +1606,11 @@ static int __init init_cpum_sampling_pmu(void)
                 return -EINVAL;
         }
 
-        if (si.ad)
+        if (si.ad) {
                 sfb_set_limits(CPUM_SF_MIN_SDB, CPUM_SF_MAX_SDB);
+                cpumsf_pmu_events_attr[1] =
+                        CPUMF_EVENT_PTR(SF, SF_CYCLES_BASIC_DIAG);
+        }
 
         sfdbg = debug_register(KMSG_COMPONENT, 2, 1, 80);
         if (!sfdbg)
diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S
index 6b09fdffbd2f..ca6294645dd3 100644
--- a/arch/s390/kernel/swsusp_asm64.S
+++ b/arch/s390/kernel/swsusp_asm64.S
@@ -177,6 +177,17 @@ restart_entry:
         lhi     %r1,1
         sigp    %r1,%r0,SIGP_SET_ARCHITECTURE
         sam64
+#ifdef CONFIG_SMP
+        larl    %r1,smp_cpu_mt_shift
+        icm     %r1,15,0(%r1)
+        jz      smt_done
+        llgfr   %r1,%r1
+smt_loop:
+        sigp    %r1,%r0,SIGP_SET_MULTI_THREADING
+        brc     8,smt_done                      /* accepted */
+        brc     2,smt_loop                      /* busy, try again */
+smt_done:
+#endif
         larl    %r1,.Lnew_pgm_check_psw
         lpswe   0(%r1)
 pgm_check_entry: