Subject: Re: [PATCH 2/2] clocksource: Make clocksource register functions void

From: Yijing Wang <[email-masked]>
Date: Thu, 23 Jan 2014 17:01:41 +0800

On 2014/1/23 16:40, Daniel Lezcano wrote:
> On 01/23/2014 08:12 AM, Yijing Wang wrote:
>> 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 <[email-masked]>
> 
> 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.

> 
>> ---
>>   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