On 2014/1/23 16:40, Daniel Lezcano wrote:

On 01/23/2014 08:12 AM, Yijing Wang wrote:

quoted

Currently, clocksource_register() and __clocksource_register_scale()
functions always return 0, it's pointless, make functions void.
And remove the dead code that check the clocksource_register_hz()
return value.

Signed-off-by: Yijing Wang <redacted>

Well, do we really want to change all these files to not take care of a return value ? What about is we have to check it again later ?

I would recommend to investigate __clocksource_register_scale and the underneath functions if there is not an error to be returned in the call stack somewhere which is ignored today.

The same applies for clocksource_register.

Hi Daniel, thanks for your comment, all functions type under __clocksource_register_scale() are void.
This just is trivial cleanup patch, I don't know whether we will check these function return value again later.
If there is some possibility to check it again, I agree to keep them. Of course, this is all determined by Thomas.

Thanks!
Yijing.

quoted

---
  arch/arm/mach-davinci/time.c                    |    5 ++---
  arch/arm/mach-msm/timer.c                       |    4 +---
  arch/arm/mach-omap2/timer.c                     |    8 +++-----
  arch/avr32/kernel/time.c                        |    4 +---
  arch/blackfin/kernel/time-ts.c                  |    6 ++----
  arch/microblaze/kernel/timer.c                  |    3 +--
  arch/mips/jz4740/time.c                         |    6 +-----
  arch/mips/loongson/common/cs5536/cs5536_mfgpt.c |    3 ++-
  arch/openrisc/kernel/time.c                     |    3 +--
  arch/powerpc/kernel/time.c                      |    6 +-----
  arch/um/kernel/time.c                           |    6 +-----
  arch/x86/platform/uv/uv_time.c                  |   14 ++++++--------
  drivers/clocksource/acpi_pm.c                   |    3 ++-
  drivers/clocksource/cadence_ttc_timer.c         |    6 +-----
  drivers/clocksource/exynos_mct.c                |    4 +---
  drivers/clocksource/i8253.c                     |    3 ++-
  drivers/clocksource/mmio.c                      |    3 ++-
  drivers/clocksource/samsung_pwm_timer.c         |    5 +----
  drivers/clocksource/scx200_hrt.c                |    3 ++-
  drivers/clocksource/tcb_clksrc.c                |    8 +-------
  drivers/clocksource/timer-marco.c               |    2 +-
  drivers/clocksource/timer-prima2.c              |    2 +-
  drivers/clocksource/vt8500_timer.c              |    4 +---
  include/linux/clocksource.h                     |    8 ++++----
  kernel/time/clocksource.c                       |    6 ++----
  kernel/time/jiffies.c                           |    3 ++-
  26 files changed, 45 insertions(+), 83 deletions(-)

diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
index 56c6eb5..9536f85 100644
--- a/arch/arm/mach-davinci/time.c
+++ b/arch/arm/mach-davinci/time.c

@@ -387,9 +387,8 @@ void __init davinci_timer_init(void)

      /* setup clocksource */
      clocksource_davinci.name = id_to_name[clocksource_id];
-    if (clocksource_register_hz(&clocksource_davinci,
-                    davinci_clock_tick_rate))
-        printk(err, clocksource_davinci.name);
+    clocksource_register_hz(&clocksource_davinci,
+                    davinci_clock_tick_rate);

      setup_sched_clock(davinci_read_sched_clock, 32,
                davinci_clock_tick_rate);

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 1e9c338..c96e034 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c

@@ -226,9 +226,7 @@ static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq,

  err:
      writel_relaxed(TIMER_ENABLE_EN, source_base + TIMER_ENABLE);
-    res = clocksource_register_hz(cs, dgt_hz);
-    if (res)
-        pr_err("clocksource_register failed\n");
+    clocksource_register_hz(cs, dgt_hz);
      setup_sched_clock(msm_sched_clock_read, sched_bits, dgt_hz);
  }

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 3ca81e0..beaf7c7 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c

@@ -473,11 +473,9 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
                     OMAP_TIMER_NONPOSTED);
      setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate);

-    if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
-        pr_err("Could not register clocksource %s\n",
-            clocksource_gpt.name);
-    else
-        pr_info("OMAP clocksource: %s at %lu Hz\n",
+    clocksource_register_hz(&clocksource_gpt, clksrc.rate);
+
+    pr_info("OMAP clocksource: %s at %lu Hz\n",
              clocksource_gpt.name, clksrc.rate);
  }

diff --git a/arch/avr32/kernel/time.c b/arch/avr32/kernel/time.c
index d0f771b..51b4a66 100644
--- a/arch/avr32/kernel/time.c
+++ b/arch/avr32/kernel/time.c

@@ -134,9 +134,7 @@ void __init time_init(void)

      /* figure rate for counter */
      counter_hz = clk_get_rate(boot_cpu_data.clk);
-    ret = clocksource_register_hz(&counter, counter_hz);
-    if (ret)
-        pr_debug("timer: could not register clocksource: %d\n", ret);
+    clocksource_register_hz(&counter, counter_hz);

      /* setup COMPARE clockevent */
      comparator.mult = div_sc(counter_hz, NSEC_PER_SEC, comparator.shift);

diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c
index cb0a484..df3bb08 100644
--- a/arch/blackfin/kernel/time-ts.c
+++ b/arch/blackfin/kernel/time-ts.c

@@ -51,8 +51,7 @@ static inline unsigned long long bfin_cs_cycles_sched_clock(void)

  static int __init bfin_cs_cycles_init(void)
  {
-    if (clocksource_register_hz(&bfin_cs_cycles, get_cclk()))
-        panic("failed to register clocksource");
+    clocksource_register_hz(&bfin_cs_cycles, get_cclk());

      return 0;
  }

@@ -103,8 +102,7 @@ static int __init bfin_cs_gptimer0_init(void)
  {
      setup_gptimer0();

-    if (clocksource_register_hz(&bfin_cs_gptimer0, get_sclk()))
-        panic("failed to register clocksource");
+    clocksource_register_hz(&bfin_cs_gptimer0, get_sclk());

      return 0;
  }

diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index 3e39b10..6a2417e 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c

@@ -208,8 +208,7 @@ static struct clocksource clocksource_microblaze = {

  static int __init xilinx_clocksource_init(void)
  {
-    if (clocksource_register_hz(&clocksource_microblaze, timer_clock_freq))
-        panic("failed to register clocksource");
+    clocksource_register_hz(&clocksource_microblaze, timer_clock_freq);

      /* stop timer1 */
      out_be32(timer_baseaddr + TCSR1,

diff --git a/arch/mips/jz4740/time.c b/arch/mips/jz4740/time.c
index 5e430ce..041cdff 100644
--- a/arch/mips/jz4740/time.c
+++ b/arch/mips/jz4740/time.c

@@ -105,7 +105,6 @@ static struct irqaction timer_irqaction = {

  void __init plat_time_init(void)
  {
-    int ret;
      uint32_t clk_rate;
      uint16_t ctrl;

@@ -121,10 +120,7 @@ void __init plat_time_init(void)

      clockevents_register_device(&jz4740_clockevent);

-    ret = clocksource_register_hz(&jz4740_clocksource, clk_rate);
-
-    if (ret)
-        printk(KERN_ERR "Failed to register clocksource: %d\n", ret);
+    clocksource_register_hz(&jz4740_clocksource, clk_rate);

      setup_irq(JZ4740_IRQ_TCU0, &timer_irqaction);

diff --git a/arch/mips/loongson/common/cs5536/cs5536_mfgpt.c b/arch/mips/loongson/common/cs5536/cs5536_mfgpt.c
index c639b9d..9fa6d99 100644
--- a/arch/mips/loongson/common/cs5536/cs5536_mfgpt.c
+++ b/arch/mips/loongson/common/cs5536/cs5536_mfgpt.c

@@ -208,7 +208,8 @@ int __init init_mfgpt_clocksource(void)
      if (num_possible_cpus() > 1)    /* MFGPT does not scale! */
          return 0;

-    return clocksource_register_hz(&clocksource_mfgpt, MFGPT_TICK_RATE);
+    clocksource_register_hz(&clocksource_mfgpt, MFGPT_TICK_RATE);
+    return 0;
  }

  arch_initcall(init_mfgpt_clocksource);

diff --git a/arch/openrisc/kernel/time.c b/arch/openrisc/kernel/time.c
index 7c52e94..3f789aa 100644
--- a/arch/openrisc/kernel/time.c
+++ b/arch/openrisc/kernel/time.c

@@ -156,8 +156,7 @@ static struct clocksource openrisc_timer = {

  static int __init openrisc_timer_init(void)
  {
-    if (clocksource_register_hz(&openrisc_timer, cpuinfo.clock_frequency))
-        panic("failed to register clocksource");
+    clocksource_register_hz(&openrisc_timer, cpuinfo.clock_frequency);

      /* Enable the incrementer: 'continuous' mode with interrupt disabled */
      mtspr(SPR_TTMR, SPR_TTMR_CR);

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index b3b1441..27c0627 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c

@@ -788,11 +788,7 @@ static void __init clocksource_init(void)
      else
          clock = &clocksource_timebase;

-    if (clocksource_register_hz(clock, tb_ticks_per_sec)) {
-        printk(KERN_ERR "clocksource: %s is already registered\n",
-               clock->name);
-        return;
-    }
+    clocksource_register_hz(clock, tb_ticks_per_sec);

      printk(KERN_INFO "clocksource: %s mult[%x] shift[%d] registered\n",
             clock->name, clock->mult, clock->shift);

diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 117568d..2034b58 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c

@@ -92,11 +92,7 @@ static void __init setup_itimer(void)
          clockevent_delta2ns(60 * HZ, &itimer_clockevent);
      itimer_clockevent.min_delta_ns =
          clockevent_delta2ns(1, &itimer_clockevent);
-    err = clocksource_register_hz(&itimer_clocksource, USEC_PER_SEC);
-    if (err) {
-        printk(KERN_ERR "clocksource_register_hz returned %d\n", err);
-        return;
-    }
+    clocksource_register_hz(&itimer_clocksource, USEC_PER_SEC);
      clockevents_register_device(&itimer_clockevent);
  }

diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
index 5c86786..b963774 100644
--- a/arch/x86/platform/uv/uv_time.c
+++ b/arch/x86/platform/uv/uv_time.c

@@ -379,15 +379,13 @@ static __init int uv_rtc_setup_clock(void)
      if (!is_uv_system())
          return -ENODEV;

-    rc = clocksource_register_hz(&clocksource_uv, sn_rtc_cycles_per_second);
-    if (rc)
-        printk(KERN_INFO "UV RTC clocksource failed rc %d\n", rc);
-    else
-        printk(KERN_INFO "UV RTC clocksource registered freq %lu MHz\n",
-            sn_rtc_cycles_per_second/(unsigned long)1E6);
+    clocksource_register_hz(&clocksource_uv, sn_rtc_cycles_per_second);
+
+    pr_info("UV RTC clocksource registered freq %lu MHz\n",
+        sn_rtc_cycles_per_second/(unsigned long)1E6);

-    if (rc || !uv_rtc_evt_enable || x86_platform_ipi_callback)
-        return rc;
+    if (!uv_rtc_evt_enable || x86_platform_ipi_callback)
+        return 0;

      /* Setup and register clockevents */
      rc = uv_rtc_allocate_timers();

diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 6eab889..ab1dc63 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c

@@ -218,8 +218,9 @@ static int __init init_acpi_pm_clocksource(void)
          return -ENODEV;
      }

-    return clocksource_register_hz(&clocksource_acpi_pm,
+    clocksource_register_hz(&clocksource_acpi_pm,
                          PMTMR_TICKS_PER_SEC);
+    return 0;
  }

  /* We use fs_initcall because we want the PCI fixups to have run

diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
index 63f176d..b9b56ed 100644
--- a/drivers/clocksource/cadence_ttc_timer.c
+++ b/drivers/clocksource/cadence_ttc_timer.c

@@ -301,11 +301,7 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
      __raw_writel(CNT_CNTRL_RESET,
               ttccs->ttc.base_addr + TTC_CNT_CNTRL_OFFSET);

-    err = clocksource_register_hz(&ttccs->cs, ttccs->ttc.freq / PRESCALE);
-    if (WARN_ON(err)) {
-        kfree(ttccs);
-        return;
-    }
+    clocksource_register_hz(&ttccs->cs, ttccs->ttc.freq / PRESCALE);

      ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET;
      sched_clock_register(ttc_sched_clock_read, 16, ttccs->ttc.freq / PRESCALE);

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 62b0de6..98649c7 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c

@@ -193,9 +193,7 @@ struct clocksource mct_frc = {
  static void __init exynos4_clocksource_init(void)
  {
      exynos4_mct_frc_start(0, 0);
-
-    if (clocksource_register_hz(&mct_frc, clk_rate))
-        panic("%s: can't register clocksource\n", mct_frc.name);
+    clocksource_register_hz(&mct_frc, clk_rate);
  }

  static void exynos4_mct_comp0_stop(void)

diff --git a/drivers/clocksource/i8253.c b/drivers/clocksource/i8253.c
index 14ee3ef..9c45f0a 100644
--- a/drivers/clocksource/i8253.c
+++ b/drivers/clocksource/i8253.c

@@ -95,7 +95,8 @@ static struct clocksource i8253_cs = {

  int __init clocksource_i8253_init(void)
  {
-    return clocksource_register_hz(&i8253_cs, PIT_TICK_RATE);
+    clocksource_register_hz(&i8253_cs, PIT_TICK_RATE);
+    return 0;
  }
  #endif

diff --git a/drivers/clocksource/mmio.c b/drivers/clocksource/mmio.c
index c0e2512..6e0b530 100644
--- a/drivers/clocksource/mmio.c
+++ b/drivers/clocksource/mmio.c

@@ -69,5 +69,6 @@ int __init clocksource_mmio_init(void __iomem *base, const char *name,
      cs->clksrc.mask = CLOCKSOURCE_MASK(bits);
      cs->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;

-    return clocksource_register_hz(&cs->clksrc, hz);
+    clocksource_register_hz(&cs->clksrc, hz);
+    return 0;
  }

diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index 5645cfc..c59292f 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c

@@ -340,7 +340,6 @@ static void __init samsung_clocksource_init(void)
  {
      unsigned long pclk;
      unsigned long clock_rate;
-    int ret;

      pclk = clk_get_rate(pwm.timerclk);

@@ -361,9 +360,7 @@ static void __init samsung_clocksource_init(void)
                          pwm.variant.bits, clock_rate);

      samsung_clocksource.mask = CLOCKSOURCE_MASK(pwm.variant.bits);
-    ret = clocksource_register_hz(&samsung_clocksource, clock_rate);
-    if (ret)
-        panic("samsung_clocksource_timer: can't register clocksource\n");
+    clocksource_register_hz(&samsung_clocksource, clock_rate);
  }

  static void __init samsung_timer_resources(void)

diff --git a/drivers/clocksource/scx200_hrt.c b/drivers/clocksource/scx200_hrt.c
index 64f9e82..57bdc04 100644
--- a/drivers/clocksource/scx200_hrt.c
+++ b/drivers/clocksource/scx200_hrt.c

@@ -83,7 +83,8 @@ static int __init init_hrt_clocksource(void)

      pr_info("enabling scx200 high-res timer (%s MHz +%d ppm)\n", mhz27 ? "27":"1", ppm);

-    return clocksource_register_hz(&cs_hrt, freq);
+    clocksource_register_hz(&cs_hrt, freq);
+    return 0;
  }

  module_init(init_hrt_clocksource);

diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 00fdd11..805245d 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c

@@ -340,9 +340,7 @@ static int __init tcb_clksrc_init(void)
      }

      /* and away we go! */
-    ret = clocksource_register_hz(&clksrc, divided_rate);
-    if (ret)
-        goto err_disable_t1;
+    clocksource_register_hz(&clksrc, divided_rate);

      /* channel 2:  periodic and oneshot timer support */
      ret = setup_clkevents(tc, clk32k_divisor_idx);

@@ -354,10 +352,6 @@ static int __init tcb_clksrc_init(void)
  err_unregister_clksrc:
      clocksource_unregister(&clksrc);

-err_disable_t1:
-    if (!tc->tcb_config || tc->tcb_config->counter_width != 32)
-        clk_disable_unprepare(tc->clk[1]);
-
  err_disable_t0:
      clk_disable_unprepare(t0_clk);

diff --git a/drivers/clocksource/timer-marco.c b/drivers/clocksource/timer-marco.c
index 09a17d9..ae78ce0 100644
--- a/drivers/clocksource/timer-marco.c
+++ b/drivers/clocksource/timer-marco.c

@@ -283,7 +283,7 @@ static void __init sirfsoc_marco_timer_init(void)
      /* Clear all interrupts */
      writel_relaxed(0xFFFF, sirfsoc_timer_base + SIRFSOC_TIMER_INTR_STATUS);

-    BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE));
+    clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE);

      sirfsoc_clockevent_init();
  }

diff --git a/drivers/clocksource/timer-prima2.c b/drivers/clocksource/timer-prima2.c
index 8a492d3..c9cc307 100644
--- a/drivers/clocksource/timer-prima2.c
+++ b/drivers/clocksource/timer-prima2.c

@@ -204,7 +204,7 @@ static void __init sirfsoc_prima2_timer_init(struct device_node *np)
      writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_HI);
      writel_relaxed(BIT(0), sirfsoc_timer_base + SIRFSOC_TIMER_STATUS);

-    BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE));
+    clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE);

      sched_clock_register(sirfsoc_read_sched_clock, 64, CLOCK_TICK_RATE);

diff --git a/drivers/clocksource/vt8500_timer.c b/drivers/clocksource/vt8500_timer.c
index 1098ed3..13f5fa4 100644
--- a/drivers/clocksource/vt8500_timer.c
+++ b/drivers/clocksource/vt8500_timer.c

@@ -150,9 +150,7 @@ static void __init vt8500_timer_init(struct device_node *np)
      writel(0xf, regbase + TIMER_STATUS_VAL);
      writel(~0, regbase + TIMER_MATCH_VAL);

-    if (clocksource_register_hz(&clocksource, VT8500_TIMER_HZ))
-        pr_err("%s: vt8500_timer_init: clocksource_register failed for %s\n",
-                    __func__, clocksource.name);
+    clocksource_register_hz(&clocksource, VT8500_TIMER_HZ);

      clockevent.cpumask = cpumask_of(0);

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 67301a4..5a17c5e 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h

@@ -282,7 +282,7 @@ static inline s64 clocksource_cyc2ns(cycle_t cycles, u32 mult, u32 shift)
  }


-extern int clocksource_register(struct clocksource*);
+extern void clocksource_register(struct clocksource *);
  extern int clocksource_unregister(struct clocksource*);
  extern void clocksource_touch_watchdog(void);
  extern struct clocksource* clocksource_get_next(void);

@@ -301,17 +301,17 @@ clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);
   * Don't call __clocksource_register_scale directly, use
   * clocksource_register_hz/khz
   */
-extern int
+extern void
  __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq);
  extern void
  __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq);

-static inline int clocksource_register_hz(struct clocksource *cs, u32 hz)
+static inline void clocksource_register_hz(struct clocksource *cs, u32 hz)
  {
      return __clocksource_register_scale(cs, 1, hz);
  }

-static inline int clocksource_register_khz(struct clocksource *cs, u32 khz)
+static inline void clocksource_register_khz(struct clocksource *cs, u32 khz)
  {
      return __clocksource_register_scale(cs, 1000, khz);
  }

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 9951575..686ff72 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c

@@ -782,7 +782,7 @@ EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
   * This *SHOULD NOT* be called directly! Please use the
   * clocksource_register_hz() or clocksource_register_khz helper functions.
   */
-int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
+void __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
  {

      /* Initialize mult/shift and max_idle_ns */

@@ -794,7 +794,6 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
      clocksource_enqueue_watchdog(cs);
      clocksource_select();
      mutex_unlock(&clocksource_mutex);
-    return 0;
  }
  EXPORT_SYMBOL_GPL(__clocksource_register_scale);

@@ -804,7 +803,7 @@ EXPORT_SYMBOL_GPL(__clocksource_register_scale);
   * @cs:        clocksource to be registered
   *
   */
-int clocksource_register(struct clocksource *cs)
+void clocksource_register(struct clocksource *cs)
  {
      /* calculate max adjustment for given mult/shift */
      cs->maxadj = clocksource_max_adjustment(cs);

@@ -820,7 +819,6 @@ int clocksource_register(struct clocksource *cs)
      clocksource_enqueue_watchdog(cs);
      clocksource_select();
      mutex_unlock(&clocksource_mutex);
-    return 0;
  }
  EXPORT_SYMBOL(clocksource_register);

diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 7a925ba..ae4c534 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c

@@ -88,7 +88,8 @@ EXPORT_SYMBOL(jiffies);

  static int __init init_jiffies_clocksource(void)
  {
-    return clocksource_register(&clocksource_jiffies);
+    clocksource_register(&clocksource_jiffies);
+    return 0;
  }

  core_initcall(init_jiffies_clocksource);

-- 
Thanks!
Yijing