8 files changed, 95 insertions, 68 deletions

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 34711757ba59..804153c0a9cf 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -417,16 +417,6 @@ local_restart:
         ldr     r10, [tsk, #TI_FLAGS]           @ check for syscall tracing
         stmdb   sp!, {r4, r5}                   @ push fifth and sixth args
 
-#ifdef CONFIG_SECCOMP
-        tst     r10, #_TIF_SECCOMP
-        beq     1f
-        mov     r0, scno
-        bl      __secure_computing      
-        add     r0, sp, #S_R0 + S_OFF           @ pointer to regs
-        ldmia   r0, {r0 - r3}                   @ have to reload r0 - r3
-1:
-#endif
-
         tst     r10, #_TIF_SYSCALL_WORK         @ are we tracing syscalls?
         bne     __sys_trace
 
@@ -458,11 +448,13 @@ __sys_trace:
         ldmccia r1, {r0 - r6}                   @ have to reload r0 - r6
         stmccia sp, {r4, r5}                    @ and update the stack args
         ldrcc   pc, [tbl, scno, lsl #2]         @ call sys_* routine
-        b       2b
+        cmp     scno, #-1                       @ skip the syscall?
+        bne     2b
+        add     sp, sp, #S_OFF                  @ restore stack
+        b       ret_slow_syscall
 
 __sys_trace_return:
         str     r0, [sp, #S_R0 + S_OFF]!        @ save returned r0
-        mov     r1, scno
         mov     r0, sp
         bl      syscall_trace_exit
         b       ret_slow_syscall
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index 278cfc144f44..2c228a07e58c 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -68,7 +68,7 @@ __after_proc_init:
          * CP15 system control register value returned in r0 from
          * the CPU init function.
          */
-#ifdef CONFIG_ALIGNMENT_TRAP
+#if defined(CONFIG_ALIGNMENT_TRAP) && __LINUX_ARM_ARCH__ < 6
         orr     r0, r0, #CR_A
 #else
         bic     r0, r0, #CR_A
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 90084a6de35a..44bc0b327e2b 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -34,6 +34,7 @@
 #include <linux/leds.h>
 
 #include <asm/cacheflush.h>
+#include <asm/idmap.h>
 #include <asm/processor.h>
 #include <asm/thread_notify.h>
 #include <asm/stacktrace.h>
@@ -56,8 +57,6 @@ static const char *isa_modes[] = {
   "ARM" , "Thumb" , "Jazelle", "ThumbEE"
 };
 
-extern void setup_mm_for_reboot(void);
-
 static volatile int hlt_counter;
 
 void disable_hlt(void)
@@ -70,6 +69,7 @@ EXPORT_SYMBOL(disable_hlt);
 void enable_hlt(void)
 {
         hlt_counter--;
+        BUG_ON(hlt_counter < 0);
 }
 
 EXPORT_SYMBOL(enable_hlt);
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 739db3a1b2d2..03deeffd9f6d 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -916,16 +916,11 @@ enum ptrace_syscall_dir {
         PTRACE_SYSCALL_EXIT,
 };
 
-static int ptrace_syscall_trace(struct pt_regs *regs, int scno,
-                                enum ptrace_syscall_dir dir)
+static int tracehook_report_syscall(struct pt_regs *regs,
+                                    enum ptrace_syscall_dir dir)
 {
         unsigned long ip;
 
-        current_thread_info()->syscall = scno;
-
-        if (!test_thread_flag(TIF_SYSCALL_TRACE))
-                return scno;
-
         /*
          * IP is used to denote syscall entry/exit:
          * IP = 0 -> entry, =1 -> exit
@@ -944,19 +939,41 @@ static int ptrace_syscall_trace(struct pt_regs *regs, int scno,
 
 asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
 {
-        scno = ptrace_syscall_trace(regs, scno, PTRACE_SYSCALL_ENTER);
+        current_thread_info()->syscall = scno;
+
+        /* Do the secure computing check first; failures should be fast. */
+        if (secure_computing(scno) == -1)
+                return -1;
+
+        if (test_thread_flag(TIF_SYSCALL_TRACE))
+                scno = tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
+
         if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
                 trace_sys_enter(regs, scno);
+
         audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0, regs->ARM_r1,
                             regs->ARM_r2, regs->ARM_r3);
+
         return scno;
 }
 
-asmlinkage int syscall_trace_exit(struct pt_regs *regs, int scno)
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
 {
-        scno = ptrace_syscall_trace(regs, scno, PTRACE_SYSCALL_EXIT);
-        if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
-                trace_sys_exit(regs, scno);
+        /*
+         * Audit the syscall before anything else, as a debugger may
+         * come in and change the current registers.
+         */
         audit_syscall_exit(regs);
-        return scno;
+
+        /*
+         * Note that we haven't updated the ->syscall field for the
+         * current thread. This isn't a problem because it will have
+         * been set on syscall entry and there hasn't been an opportunity
+         * for a PTRACE_SET_SYSCALL since then.
+         */
+        if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+                trace_sys_exit(regs, regs_return_value(regs));
+
+        if (test_thread_flag(TIF_SYSCALL_TRACE))
+                tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
 }
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c
index e21bac20d90d..fc6692e2b603 100644
--- a/arch/arm/kernel/sched_clock.c
+++ b/arch/arm/kernel/sched_clock.c
@@ -107,13 +107,6 @@ static void sched_clock_poll(unsigned long wrap_ticks)
         update_sched_clock();
 }
 
-void __init setup_sched_clock_needs_suspend(u32 (*read)(void), int bits,
-                unsigned long rate)
-{
-        setup_sched_clock(read, bits, rate);
-        cd.needs_suspend = true;
-}
-
 void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate)
 {
         unsigned long r, w;
@@ -189,18 +182,15 @@ void __init sched_clock_postinit(void)
 static int sched_clock_suspend(void)
 {
         sched_clock_poll(sched_clock_timer.data);
-        if (cd.needs_suspend)
-                cd.suspended = true;
+        cd.suspended = true;
         return 0;
 }
 
 static void sched_clock_resume(void)
 {
-        if (cd.needs_suspend) {
-                cd.epoch_cyc = read_sched_clock();
-                cd.epoch_cyc_copy = cd.epoch_cyc;
-                cd.suspended = false;
-        }
+        cd.epoch_cyc = read_sched_clock();
+        cd.epoch_cyc_copy = cd.epoch_cyc;
+        cd.suspended = false;
 }
 
 static struct syscore_ops sched_clock_ops = {
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index fbc8b2623d82..57f537731979 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -421,6 +421,11 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask)
         smp_cross_call(mask, IPI_CALL_FUNC);
 }
 
+void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
+{
+        smp_cross_call(mask, IPI_WAKEUP);
+}
+
 void arch_send_call_function_single_ipi(int cpu)
 {
         smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
@@ -443,7 +448,7 @@ void show_ipi_list(struct seq_file *p, int prec)
         for (i = 0; i < NR_IPI; i++) {
                 seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
 
-                for_each_present_cpu(cpu)
+                for_each_online_cpu(cpu)
                         seq_printf(p, "%10u ",
                                    __get_irq_stat(cpu, ipi_irqs[i]));
 
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index b22d700fea27..ff07879ad95d 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -31,6 +31,8 @@ static void __iomem *twd_base;
 
 static struct clk *twd_clk;
 static unsigned long twd_timer_rate;
+static bool common_setup_called;
+static DEFINE_PER_CPU(bool, percpu_setup_called);
 
 static struct clock_event_device __percpu **twd_evt;
 static int twd_ppi;
@@ -248,17 +250,9 @@ static struct clk *twd_get_clock(void)
                 return clk;
         }
 
-        err = clk_prepare(clk);
+        err = clk_prepare_enable(clk);
         if (err) {
-                pr_err("smp_twd: clock failed to prepare: %d\n", err);
-                clk_put(clk);
-                return ERR_PTR(err);
-        }
-
-        err = clk_enable(clk);
-        if (err) {
-                pr_err("smp_twd: clock failed to enable: %d\n", err);
-                clk_unprepare(clk);
+                pr_err("smp_twd: clock failed to prepare+enable: %d\n", err);
                 clk_put(clk);
                 return ERR_PTR(err);
         }
@@ -272,15 +266,45 @@ static struct clk *twd_get_clock(void)
 static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
 {
         struct clock_event_device **this_cpu_clk;
+        int cpu = smp_processor_id();
+
+        /*
+         * If the basic setup for this CPU has been done before don't
+         * bother with the below.
+         */
+        if (per_cpu(percpu_setup_called, cpu)) {
+                __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
+                clockevents_register_device(*__this_cpu_ptr(twd_evt));
+                enable_percpu_irq(clk->irq, 0);
+                return 0;
+        }
+        per_cpu(percpu_setup_called, cpu) = true;
 
-        if (!twd_clk)
+        /*
+         * This stuff only need to be done once for the entire TWD cluster
+         * during the runtime of the system.
+         */
+        if (!common_setup_called) {
                 twd_clk = twd_get_clock();
 
-        if (!IS_ERR_OR_NULL(twd_clk))
-                twd_timer_rate = clk_get_rate(twd_clk);
-        else
-                twd_calibrate_rate();
+                /*
+                 * We use IS_ERR_OR_NULL() here, because if the clock stubs
+                 * are active we will get a valid clk reference which is
+                 * however NULL and will return the rate 0. In that case we
+                 * need to calibrate the rate instead.
+                 */
+                if (!IS_ERR_OR_NULL(twd_clk))
+                        twd_timer_rate = clk_get_rate(twd_clk);
+                else
+                        twd_calibrate_rate();
+
+                common_setup_called = true;
+        }
 
+        /*
+         * The following is done once per CPU the first time .setup() is
+         * called.
+         */
         __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
 
         clk->name = "local_timer";
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 36ff15bbfdd4..b9f38e388b43 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -114,6 +114,15 @@ SECTIONS
 
         RO_DATA(PAGE_SIZE)
 
+        . = ALIGN(4);
+        __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
+                __start___ex_table = .;
+#ifdef CONFIG_MMU
+                *(__ex_table)
+#endif
+                __stop___ex_table = .;
+        }
+
 #ifdef CONFIG_ARM_UNWIND
         /*
          * Stack unwinding tables
@@ -220,16 +229,6 @@ SECTIONS
                 READ_MOSTLY_DATA(L1_CACHE_BYTES)
 
                 /*
-                 * The exception fixup table (might need resorting at runtime)
-                 */
-                . = ALIGN(4);
-                __start___ex_table = .;
-#ifdef CONFIG_MMU
-                *(__ex_table)
-#endif
-                __stop___ex_table = .;
-
-                /*
                  * and the usual data section
                  */
                 DATA_DATA