4 files changed, 24 insertions, 22 deletions

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index a6cfb1791af..e864e482118 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -163,8 +163,6 @@ ENDPROC(__und_invalid)
         @  r4 - orig_r0 (see pt_regs definition in ptrace.h)
         @
         stmia   r5, {r0 - r4}
-
-        asm_trace_hardirqs_off
         .endm
 
         .align  5
@@ -205,7 +203,7 @@ __dabt_svc:
         @
         @ IRQs off again before pulling preserved data off the stack
         @
-        disable_irq
+        disable_irq_notrace
 
         @
         @ restore SPSR and restart the instruction
@@ -219,6 +217,9 @@ ENDPROC(__dabt_svc)
 __irq_svc:
         svc_entry
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+        bl      trace_hardirqs_off
+#endif
 #ifdef CONFIG_PREEMPT
         get_thread_info tsk
         ldr     r8, [tsk, #TI_PREEMPT]          @ get preempt count
@@ -292,7 +293,7 @@ __und_svc:
         @
         @ IRQs off again before pulling preserved data off the stack
         @
-1:      disable_irq
+1:      disable_irq_notrace
 
         @
         @ restore SPSR and restart the instruction
@@ -328,7 +329,7 @@ __pabt_svc:
         @
         @ IRQs off again before pulling preserved data off the stack
         @
-        disable_irq
+        disable_irq_notrace
 
         @
         @ restore SPSR and restart the instruction
@@ -394,8 +395,6 @@ ENDPROC(__pabt_svc)
         @ Clear FP to mark the first stack frame
         @
         zero_fp
-
-        asm_trace_hardirqs_off
         .endm
 
         .macro  kuser_cmpxchg_check
@@ -466,9 +465,6 @@ __irq_usr:
  THUMB( movne   r0, #0          )
  THUMB( strne   r0, [r0]        )
 #endif
-#ifdef CONFIG_TRACE_IRQFLAGS
-        bl      trace_hardirqs_on
-#endif
 
         mov     why, #0
         b       ret_to_user
diff --git a/arch/arm/kernel/kprobes-decode.c b/arch/arm/kernel/kprobes-decode.c
index da1f94906a4..8bccbfa693f 100644
--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -583,13 +583,14 @@ static void __kprobes emulate_ldr(struct kprobe *p, struct pt_regs *regs)
 {
         insn_llret_3arg_fn_t *i_fn = (insn_llret_3arg_fn_t *)&p->ainsn.insn[0];
         kprobe_opcode_t insn = p->opcode;
+        long ppc = (long)p->addr + 8;
         union reg_pair fnr;
         int rd = (insn >> 12) & 0xf;
         int rn = (insn >> 16) & 0xf;
         int rm = insn & 0xf;
         long rdv;
-        long rnv  = regs->uregs[rn];
-        long rmv  = regs->uregs[rm]; /* rm/rmv may be invalid, don't care. */
+        long rnv = (rn == 15) ? ppc : regs->uregs[rn];
+        long rmv = (rm == 15) ? ppc : regs->uregs[rm];
         long cpsr = regs->ARM_cpsr;
 
         fnr.dr = insnslot_llret_3arg_rflags(rnv, 0, rmv, cpsr, i_fn);
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index c45768614c8..de12536d687 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -201,7 +201,7 @@ armpmu_event_update(struct perf_event *event,
 {
         int shift = 64 - 32;
         s64 prev_raw_count, new_raw_count;
-        s64 delta;
+        u64 delta;
 
 again:
         prev_raw_count = atomic64_read(&hwc->prev_count);
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index acf5e6fdb6d..a4a9cc88bec 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -351,17 +351,21 @@ EXPORT_SYMBOL(dump_fpu);
 
 /*
  * Shuffle the argument into the correct register before calling the
- * thread function.  r1 is the thread argument, r2 is the pointer to
- * the thread function, and r3 points to the exit function.
+ * thread function.  r4 is the thread argument, r5 is the pointer to
+ * the thread function, and r6 points to the exit function.
  */
 extern void kernel_thread_helper(void);
 asm(    ".pushsection .text\n"
 "       .align\n"
 "       .type   kernel_thread_helper, #function\n"
 "kernel_thread_helper:\n"
-"       mov     r0, r1\n"
-"       mov     lr, r3\n"
-"       mov     pc, r2\n"
+#ifdef CONFIG_TRACE_IRQFLAGS
+"       bl      trace_hardirqs_on\n"
+#endif
+"       msr     cpsr_c, r7\n"
+"       mov     r0, r4\n"
+"       mov     lr, r6\n"
+"       mov     pc, r5\n"
 "       .size   kernel_thread_helper, . - kernel_thread_helper\n"
 "       .popsection");
 
@@ -391,11 +395,12 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 
         memset(&regs, 0, sizeof(regs));
 
-        regs.ARM_r1 = (unsigned long)arg;
-        regs.ARM_r2 = (unsigned long)fn;
-        regs.ARM_r3 = (unsigned long)kernel_thread_exit;
+        regs.ARM_r4 = (unsigned long)arg;
+        regs.ARM_r5 = (unsigned long)fn;
+        regs.ARM_r6 = (unsigned long)kernel_thread_exit;
+        regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
         regs.ARM_pc = (unsigned long)kernel_thread_helper;
-        regs.ARM_cpsr = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
+        regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT;
 
         return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
 }