linux-kernel - Re: [PATCH] sound: pci: pcxhr: convert timeval to ktime

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Date:	Tue, 28 Oct 2014 12:59:59 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Aya Mahfouz <mahfouz.saif.elyazal@...il.com>
Cc:	perex@...ex.cz, bhelgaas@...gle.com, benoit.taine@...6.fr,
	arnd@...db.de, opw-kernel@...glegroups.com,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound: pci: pcxhr: convert timeval to ktime_t

At Tue, 28 Oct 2014 13:29:56 +0200,
Aya Mahfouz wrote:
> 
> This patch is concerned with migrating the time variables in the pcxhr
> module found in the sound driver. The changes are concerend with the
> y2038 problem where timeval will overflow in the year 2038. ktime_t
> was used instead of timeval to get the wall time. The difference
> is displayed now in nanoseconds instead of microseconds.
> 
> Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@...il.com>
> Reviewed-by: Arnd Bergmann <arnd@...db.de>

It gets compile errors like below.  Please submit a patch at least
after build testing.

thanks,

Takashi

===

sound/pci/pcxhr/pcxhr_core.c: In function ‘pcxhr_set_pipe_state’:
sound/pci/pcxhr/pcxhr_core.c:913:10: error: ‘start’ redeclared as different kind of symbol
  ktime_t start, stop, diff;
          ^
sound/pci/pcxhr/pcxhr_core.c:907:27: note: previous definition of ‘start’ was here
     int capture_mask, int start)
                           ^
In file included from include/linux/printk.h:260:0,
                 from include/linux/kernel.h:13,
                 from include/linux/delay.h:10,
                 from sound/pci/pcxhr/pcxhr_core.c:23:
sound/pci/pcxhr/pcxhr_core.c:923:13: error: used union type value where scalar is required
       start ? "START" : "STOP", audio_mask, state);
             ^
include/linux/dynamic_debug.h:87:9: note: in definition of macro ‘dynamic_dev_dbg’
       ##__VA_ARGS__);  \
         ^
sound/pci/pcxhr/pcxhr_core.c:921:2: note: in expansion of macro ‘dev_dbg’
  dev_dbg(&mgr->pci->dev,
  ^
sound/pci/pcxhr/pcxhr_core.c:924:6: error: used union type value where scalar is required
  if (start) {
      ^
sound/pci/pcxhr/pcxhr_core.c:950:38: error: used union type value where scalar is required
   if ((state & audio_mask) == (start ? audio_mask : 0))
                                      ^
sound/pci/pcxhr/pcxhr_core.c:958:6: error: wrong type argument to unary exclamation mark
  if (!start) {
      ^
scripts/Makefile.build:257: recipe for target 'sound/pci/pcxhr/pcxhr_core.o' failed


> ---
>  sound/pci/pcxhr/pcxhr.c      | 10 ++++++----
>  sound/pci/pcxhr/pcxhr_core.c | 10 ++++++----
>  2 files changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/sound/pci/pcxhr/pcxhr.c b/sound/pci/pcxhr/pcxhr.c
> index b854fc5..3f4607c 100644
> --- a/sound/pci/pcxhr/pcxhr.c
> +++ b/sound/pci/pcxhr/pcxhr.c
> @@ -711,8 +711,9 @@ static void pcxhr_start_linked_stream(struct pcxhr_mgr *mgr)
>  	int playback_mask = 0;
>  
>  #ifdef CONFIG_SND_DEBUG_VERBOSE
> -	struct timeval my_tv1, my_tv2;
> -	do_gettimeofday(&my_tv1);
> +	ktime_t start, stop, diff;
> +
> +	start = ktime_get();
>  #endif
>  	mutex_lock(&mgr->setup_mutex);
>  
> @@ -823,9 +824,10 @@ static void pcxhr_start_linked_stream(struct pcxhr_mgr *mgr)
>  	mutex_unlock(&mgr->setup_mutex);
>  
>  #ifdef CONFIG_SND_DEBUG_VERBOSE
> -	do_gettimeofday(&my_tv2);
> +	stop = ktime_get();
> +	diff = ktime_sub(stop, start);
>  	dev_dbg(&mgr->pci->dev, "***TRIGGER START*** TIME = %ld (err = %x)\n",
> -		    (long)(my_tv2.tv_usec - my_tv1.tv_usec), err);
> +			(long)(ktime_to_ns(diff)), err);
>  #endif
>  }
>  
> diff --git a/sound/pci/pcxhr/pcxhr_core.c b/sound/pci/pcxhr/pcxhr_core.c
> index a584acb..be3c003 100644
> --- a/sound/pci/pcxhr/pcxhr_core.c
> +++ b/sound/pci/pcxhr/pcxhr_core.c
> @@ -910,8 +910,9 @@ int pcxhr_set_pipe_state(struct pcxhr_mgr *mgr, int playback_mask,
>  	int audio_mask;
>  
>  #ifdef CONFIG_SND_DEBUG_VERBOSE
> -	struct timeval my_tv1, my_tv2;
> -	do_gettimeofday(&my_tv1);
> +	ktime_t start, stop, diff;
> +
> +	start = ktime_get();
>  #endif
>  	audio_mask = (playback_mask |
>  		      (capture_mask << PCXHR_PIPE_STATE_CAPTURE_OFFSET));
> @@ -960,9 +961,10 @@ int pcxhr_set_pipe_state(struct pcxhr_mgr *mgr, int playback_mask,
>  			return err;
>  	}
>  #ifdef CONFIG_SND_DEBUG_VERBOSE
> -	do_gettimeofday(&my_tv2);
> +	stop = ktime_get();
> +	diff = ktime_sub(stop, start);
>  	dev_dbg(&mgr->pci->dev, "***SET PIPE STATE*** TIME = %ld (err = %x)\n",
> -		    (long)(my_tv2.tv_usec - my_tv1.tv_usec), err);
> +			(long)(ktime_to_ns(diff)), err);
>  #endif
>  	return 0;
>  }
> -- 
> 1.9.3
> 
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