13 files changed, 94 insertions, 40 deletions

diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
index df44c8cf9e2e..cf258807160d 100644
--- a/arch/arm/kernel/arch_timer.c
+++ b/arch/arm/kernel/arch_timer.c
@@ -32,6 +32,8 @@ static int arch_timer_ppi2;
 
 static struct clock_event_device __percpu **arch_timer_evt;
 
+extern void init_current_timer_delay(unsigned long freq);
+
 /*
  * Architected system timer support.
  */
@@ -223,6 +225,14 @@ static cycle_t arch_counter_read(struct clocksource *cs)
         return arch_counter_get_cntpct();
 }
 
+int read_current_timer(unsigned long *timer_val)
+{
+        if (!arch_timer_rate)
+                return -ENXIO;
+        *timer_val = arch_counter_get_cntpct();
+        return 0;
+}
+
 static struct clocksource clocksource_counter = {
         .name   = "arch_sys_counter",
         .rating = 400,
@@ -296,6 +306,7 @@ static int __init arch_timer_register(void)
         if (err)
                 goto out_free_irq;
 
+        init_current_timer_delay(arch_timer_rate);
         return 0;
 
 out_free_irq:
diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index c3dff6abc89d..60d3b738d420 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -49,8 +49,7 @@ extern void __aeabi_ulcmp(void);
 extern void fpundefinstr(void);
 
         /* platform dependent support */
-EXPORT_SYMBOL(__udelay);
-EXPORT_SYMBOL(__const_udelay);
+EXPORT_SYMBOL(arm_delay_ops);
 
         /* networking */
 EXPORT_SYMBOL(csum_partial);
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 437f0c426517..0d1851ca6eb9 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -495,6 +495,7 @@ ENDPROC(__und_usr)
  * The out of line fixup for the ldrt above.
  */
         .pushsection .fixup, "ax"
+        .align  2
 4:      mov     pc, r9
         .popsection
         .pushsection __ex_table,"a"
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 4afed88d250a..49d9f9305247 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -95,13 +95,7 @@ ENDPROC(ret_to_user)
 ENTRY(ret_from_fork)
         bl      schedule_tail
         get_thread_info tsk
-        ldr     r1, [tsk, #TI_FLAGS]            @ check for syscall tracing
         mov     why, #1
-        tst     r1, #_TIF_SYSCALL_WORK          @ are we tracing syscalls?
-        beq     ret_slow_syscall
-        mov     r1, sp
-        mov     r0, #1                          @ trace exit [IP = 1]
-        bl      syscall_trace
         b       ret_slow_syscall
 ENDPROC(ret_from_fork)
 
@@ -448,10 +442,9 @@ ENDPROC(vector_swi)
          * context switches, and waiting for our parent to respond.
          */
 __sys_trace:
-        mov     r2, scno
-        add     r1, sp, #S_OFF
-        mov     r0, #0                          @ trace entry [IP = 0]
-        bl      syscall_trace
+        mov     r1, scno
+        add     r0, sp, #S_OFF
+        bl      syscall_trace_enter
 
         adr     lr, BSYM(__sys_trace_return)    @ return address
         mov     scno, r0                        @ syscall number (possibly new)
@@ -463,10 +456,9 @@ __sys_trace:
 
 __sys_trace_return:
         str     r0, [sp, #S_R0 + S_OFF]!        @ save returned r0
-        mov     r2, scno
-        mov     r1, sp
-        mov     r0, #1                          @ trace exit [IP = 1]
-        bl      syscall_trace
+        mov     r1, scno
+        mov     r0, sp
+        bl      syscall_trace_exit
         b       ret_slow_syscall
 
         .align  5
diff --git a/arch/arm/kernel/kprobes-test-arm.c b/arch/arm/kernel/kprobes-test-arm.c
index ba32b393b3f0..38c1a3b103a0 100644
--- a/arch/arm/kernel/kprobes-test-arm.c
+++ b/arch/arm/kernel/kprobes-test-arm.c
@@ -187,8 +187,8 @@ void kprobe_arm_test_cases(void)
         TEST_BF_R ("mov pc, r",0,2f,"")
         TEST_BF_RR("mov pc, r",0,2f,", asl r",1,0,"")
         TEST_BB(   "sub pc, pc, #1b-2b+8")
-#if __LINUX_ARM_ARCH__ >= 6
-        TEST_BB(   "sub pc, pc, #1b-2b+8-2") /* UNPREDICTABLE before ARMv6 */
+#if __LINUX_ARM_ARCH__ == 6 && !defined(CONFIG_CPU_V7)
+        TEST_BB(   "sub pc, pc, #1b-2b+8-2") /* UNPREDICTABLE before and after ARMv6 */
 #endif
         TEST_BB_R( "sub pc, pc, r",14, 1f-2f+8,"")
         TEST_BB_R( "rsb pc, r",14,1f-2f+8,", pc")
diff --git a/arch/arm/kernel/kprobes-thumb.c b/arch/arm/kernel/kprobes-thumb.c
index 8f96ec778e8d..6123daf397a7 100644
--- a/arch/arm/kernel/kprobes-thumb.c
+++ b/arch/arm/kernel/kprobes-thumb.c
@@ -660,7 +660,7 @@ static const union decode_item t32_table_1111_100x[] = {
         /* LDRSB (literal)      1111 1001 x001 1111 xxxx xxxx xxxx xxxx */
         /* LDRH (literal)       1111 1000 x011 1111 xxxx xxxx xxxx xxxx */
         /* LDRSH (literal)      1111 1001 x011 1111 xxxx xxxx xxxx xxxx */
-        DECODE_EMULATEX (0xfe5f0000, 0xf81f0000, t32_simulate_ldr_literal,
+        DECODE_SIMULATEX(0xfe5f0000, 0xf81f0000, t32_simulate_ldr_literal,
                                                  REGS(PC, NOSPPCX, 0, 0, 0)),
 
         /* STRB (immediate)     1111 1000 0000 xxxx xxxx 1xxx xxxx xxxx */
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index df85eda3add3..ab243b87118d 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -500,7 +500,7 @@ __hw_perf_event_init(struct perf_event *event)
              event_requires_mode_exclusion(&event->attr)) {
                 pr_debug("ARM performance counters do not support "
                          "mode exclusion\n");
-                return -EPERM;
+                return -EOPNOTSUPP;
         }
 
         /*
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 5700a7ae7f0b..dab711e6e1ca 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -25,7 +25,6 @@
 #include <linux/regset.h>
 #include <linux/audit.h>
 #include <linux/tracehook.h>
-#include <linux/unistd.h>
 
 #include <asm/pgtable.h>
 #include <asm/traps.h>
@@ -908,18 +907,16 @@ long arch_ptrace(struct task_struct *child, long request,
         return ret;
 }
 
-asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
+enum ptrace_syscall_dir {
+        PTRACE_SYSCALL_ENTER = 0,
+        PTRACE_SYSCALL_EXIT,
+};
+
+static int ptrace_syscall_trace(struct pt_regs *regs, int scno,
+                                enum ptrace_syscall_dir dir)
 {
         unsigned long ip;
 
-        if (why)
-                audit_syscall_exit(regs);
-        else
-                audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0,
-                                    regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
-
-        if (why == 0 && test_and_clear_thread_flag(TIF_SYSCALL_RESTARTSYS))
-                scno = __NR_restart_syscall - __NR_SYSCALL_BASE;
         if (!test_thread_flag(TIF_SYSCALL_TRACE))
                 return scno;
 
@@ -930,14 +927,28 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
          * IP = 0 -> entry, =1 -> exit
          */
         ip = regs->ARM_ip;
-        regs->ARM_ip = why;
+        regs->ARM_ip = dir;
 
-        if (why)
+        if (dir == PTRACE_SYSCALL_EXIT)
                 tracehook_report_syscall_exit(regs, 0);
         else if (tracehook_report_syscall_entry(regs))
                 current_thread_info()->syscall = -1;
 
         regs->ARM_ip = ip;
-
         return current_thread_info()->syscall;
 }
+
+asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
+{
+        int ret = ptrace_syscall_trace(regs, scno, PTRACE_SYSCALL_ENTER);
+        audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0, regs->ARM_r1,
+                            regs->ARM_r2, regs->ARM_r3);
+        return ret;
+}
+
+asmlinkage int syscall_trace_exit(struct pt_regs *regs, int scno)
+{
+        int ret = ptrace_syscall_trace(regs, scno, PTRACE_SYSCALL_EXIT);
+        audit_syscall_exit(regs);
+        return ret;
+}
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index fd2392a17ac1..536c5d6b340b 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -27,6 +27,7 @@
  */
 #define SWI_SYS_SIGRETURN       (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
 #define SWI_SYS_RT_SIGRETURN    (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
+#define SWI_SYS_RESTART         (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
 
 /*
  * With EABI, the syscall number has to be loaded into r7.
@@ -47,6 +48,18 @@ const unsigned long sigreturn_codes[7] = {
 };
 
 /*
+ * Either we support OABI only, or we have EABI with the OABI
+ * compat layer enabled.  In the later case we don't know if
+ * user space is EABI or not, and if not we must not clobber r7.
+ * Always using the OABI syscall solves that issue and works for
+ * all those cases.
+ */
+const unsigned long syscall_restart_code[2] = {
+        SWI_SYS_RESTART,        /* swi  __NR_restart_syscall */
+        0xe49df004,             /* ldr  pc, [sp], #4 */
+};
+
+/*
  * atomically swap in the new signal mask, and wait for a signal.
  */
 asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
@@ -592,10 +605,12 @@ static void do_signal(struct pt_regs *regs, int syscall)
                 case -ERESTARTNOHAND:
                 case -ERESTARTSYS:
                 case -ERESTARTNOINTR:
-                case -ERESTART_RESTARTBLOCK:
                         regs->ARM_r0 = regs->ARM_ORIG_r0;
                         regs->ARM_pc = restart_addr;
                         break;
+                case -ERESTART_RESTARTBLOCK:
+                        regs->ARM_r0 = -EINTR;
+                        break;
                 }
         }
 
@@ -611,14 +626,12 @@ static void do_signal(struct pt_regs *regs, int syscall)
                  * debugger has chosen to restart at a different PC.
                  */
                 if (regs->ARM_pc == restart_addr) {
-                        if (retval == -ERESTARTNOHAND ||
-                            retval == -ERESTART_RESTARTBLOCK
+                        if (retval == -ERESTARTNOHAND
                             || (retval == -ERESTARTSYS
                                 && !(ka.sa.sa_flags & SA_RESTART))) {
                                 regs->ARM_r0 = -EINTR;
                                 regs->ARM_pc = continue_addr;
                         }
-                        clear_thread_flag(TIF_SYSCALL_RESTARTSYS);
                 }
 
                 handle_signal(signr, &ka, &info, regs);
@@ -632,8 +645,29 @@ static void do_signal(struct pt_regs *regs, int syscall)
                  * ignore the restart.
                  */
                 if (retval == -ERESTART_RESTARTBLOCK
-                    && regs->ARM_pc == restart_addr)
-                        set_thread_flag(TIF_SYSCALL_RESTARTSYS);
+                    && regs->ARM_pc == continue_addr) {
+                        if (thumb_mode(regs)) {
+                                regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE;
+                                regs->ARM_pc -= 2;
+                        } else {
+#if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT)
+                                regs->ARM_r7 = __NR_restart_syscall;
+                                regs->ARM_pc -= 4;
+#else
+                                u32 __user *usp;
+
+                                regs->ARM_sp -= 4;
+                                usp = (u32 __user *)regs->ARM_sp;
+
+                                if (put_user(regs->ARM_pc, usp) == 0) {
+                                        regs->ARM_pc = KERN_RESTART_CODE;
+                                } else {
+                                        regs->ARM_sp += 4;
+                                        force_sigsegv(0, current);
+                                }
+#endif
+                        }
+                }
         }
 
         restore_saved_sigmask();
diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h
index 5ff067b7c752..6fcfe8398aa4 100644
--- a/arch/arm/kernel/signal.h
+++ b/arch/arm/kernel/signal.h
@@ -8,5 +8,7 @@
  * published by the Free Software Foundation.
  */
 #define KERN_SIGRETURN_CODE     (CONFIG_VECTORS_BASE + 0x00000500)
+#define KERN_RESTART_CODE       (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes))
 
 extern const unsigned long sigreturn_codes[7];
+extern const unsigned long syscall_restart_code[2];
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 2c7217d971db..aea74f5bc34a 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -179,7 +179,7 @@ void __ref cpu_die(void)
         mb();
 
         /* Tell __cpu_die() that this CPU is now safe to dispose of */
-        complete(&cpu_died);
+        RCU_NONIDLE(complete(&cpu_died));
 
         /*
          * actual CPU shutdown procedure is at least platform (if not
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 2df8715c36c0..8b97d739b17b 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -852,6 +852,8 @@ void __init early_trap_init(void *vectors_base)
          */
         memcpy((void *)(vectors + KERN_SIGRETURN_CODE - CONFIG_VECTORS_BASE),
                sigreturn_codes, sizeof(sigreturn_codes));
+        memcpy((void *)(vectors + KERN_RESTART_CODE - CONFIG_VECTORS_BASE),
+               syscall_restart_code, sizeof(syscall_restart_code));
 
         flush_icache_range(vectors, vectors + PAGE_SIZE);
         modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 43a31fb06318..36ff15bbfdd4 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -183,7 +183,9 @@ SECTIONS
         }
 #endif
 
+#ifdef CONFIG_SMP
         PERCPU_SECTION(L1_CACHE_BYTES)
+#endif
 
 #ifdef CONFIG_XIP_KERNEL
         __data_loc = ALIGN(4);          /* location in binary */