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Tim Bird | 8 Feb 03:21
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[PATCH 1/5] logger: Change logger_offset() from macro to function

Convert to function and add log as a parameter, rather than relying
on log in the context of the macro.

Signed-off-by: Tim Bird <tim.bird <at> am.sony.com>
---
 drivers/staging/android/logger.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index ffc2d04..92456d7 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -60,7 +60,11 @@ struct logger_reader {
 };

 /* logger_offset - returns index 'n' into the log via (optimized) modulus */
-#define logger_offset(n)	((n) & (log->size - 1))
+size_t logger_offset(struct logger_log *log, size_t n)
+{
+	return n & (log->size-1);
+}
+

 /*
  * file_get_log - Given a file structure, return the associated log
@@ -137,7 +141,7 @@ static ssize_t do_read_log_to_user(struct logger_log *log,
 		if (copy_to_user(buf + len, log->buffer, count - len))
 			return -EFAULT;

-	reader->r_off = logger_offset(reader->r_off + count);
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Tim Bird | 8 Feb 03:32
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[PATCH 4/5] logger: clarify code in clock_interval

Add commentary, rename the function and make the code easier to read.

Signed-off-by: Tim Bird <tim.bird <at> am.sony.com>
---
 drivers/staging/android/logger.c |   28 ++++++++++++++++++++--------
 1 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index 54b7cdf..8d9d4f1 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -242,16 +242,28 @@ static size_t get_next_entry(struct logger_log *log, size_t off, size_t len)
 }

 /*
- * clock_interval - is a < c < b in mod-space? Put another way, does the line
- * from a to b cross c?
+ * is_between - is a < c < b, accounting for wrapping of a, b, and c
+ *    positions in the buffer
+ *
+ * That is, if a<b, check for c between a and b
+ * and if a>b, check for c outside (not between) a and b
+ *
+ * |------- a xxxxxxxx b --------|
+ *               c^
+ *
+ * |xxxxx b --------- a xxxxxxxxx|
+ *    c^
+ *  or                    c^
  */
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Frank Rowand | 8 Feb 04:22
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Re: [PATCH 1/5] logger: Change logger_offset() from macro to function

On 02/07/12 18:21, Tim Bird wrote:
> Convert to function and add log as a parameter, rather than relying
> on log in the context of the macro.
> 
> Signed-off-by: Tim Bird <tim.bird <at> am.sony.com>
> ---
>  drivers/staging/android/logger.c |   16 ++++++++++------
>  1 files changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
> index ffc2d04..92456d7 100644
> --- a/drivers/staging/android/logger.c
> +++ b/drivers/staging/android/logger.c
> @@ -60,7 +60,11 @@ struct logger_reader {
>  };
> 
>  /* logger_offset - returns index 'n' into the log via (optimized) modulus */
> -#define logger_offset(n)	((n) & (log->size - 1))
> +size_t logger_offset(struct logger_log *log, size_t n)
> +{
> +	return n & (log->size-1);

        return n & (log->size - 1);
> +}
> +

Reviewed-by: Frank Rowand <frank.rowand <at> am.sony.com>
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woody | 8 Feb 10:54
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Dima Zavin | 9 Feb 06:56
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Re: [PATCH 3/5] logger: reorder prepare_to_wait and mutex_lock

On Tue, Feb 7, 2012 at 6:30 PM, Tim Bird <tim.bird <at> am.sony.com> wrote:
> If mutex_lock waits, it will return in state TASK_RUNNING,
> rubbing out the effect of prepare_to_wait().
>
> Signed-off-by: Tim Bird <tim.bird <at> am.sony.com>

Acked-by: Dima Zavin <dima <at> android.com>

> ---
>  drivers/staging/android/logger.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
> index 92cfd94..54b7cdf 100644
> --- a/drivers/staging/android/logger.c
> +++ b/drivers/staging/android/logger.c
> @@ -172,9 +172,10 @@ static ssize_t logger_read(struct file *file, char __user *buf,
>
>  start:
>        while (1) {
> +               mutex_lock(&log->mutex);
> +
>                prepare_to_wait(&log->wq, &wait, TASK_INTERRUPTIBLE);
>
> -               mutex_lock(&log->mutex);
>                ret = (log->w_off == reader->r_off);
>                mutex_unlock(&log->mutex);
>                if (!ret)
> --
> 1.7.2.3
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