linux-kernel - Re: [PATCH] cpumask: add a few comments of cpumask functions

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Date:	Wed, 30 May 2012 18:40:12 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	rusty@...tcorp.com.au, akpm@...ux-foundation.org,
	paul.gortmaker@...driver.com, kosaki.motohiro@...fujitsu.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpumask: add a few comments of cpumask functions

On 05/29/2012 09:16 AM, Alex Shi wrote:

> 
>>>> s/return/Returns
>>>>
>>>> What do you mean by "old" cpumask?
>>>
>>> Thanks for comments!
>>> Should be "the old bitmap of cpumask"?
>>>
>>
>>
>> No, there is no "old" or "new" cpumask here because this function doesn't
>> change the cpumask. It just checks if that bit is set.
>> So something like:
>> Returns 1 if 'cpu' is set in 'cpumask', else returns 0.
>>
> 
> 
> 
> Sure, thanks! and comments changed again following your style.
> Is the following new update patch ok?


Any further comments for this patch? :)

> 
> 
> From 1daa52caf1ba83eea0975a9250becd85dd5a5315 Mon Sep 17 00:00:00 2001
> From: Alex Shi <alex.shi@...el.com>
> Date: Mon, 28 May 2012 22:23:51 +0800
> Subject: [PATCH] cpumask: add a few comments of cpumask functions
> 
> Current few cpumask functions' purposes are not quite clear. Stupid
> user like myself needs to dig into details for clear function
> purpose and return value.
> Add few explanation for them is helpful.
> 
> Thanks for Srivatsa's comments and correction!
> 
> Signed-off-by: Alex Shi <alex.shi@...el.com>
> ---
>  include/linux/cpumask.h |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
> index a2c819d..170c5af 100644
> --- a/include/linux/cpumask.h
> +++ b/include/linux/cpumask.h
> @@ -271,6 +271,7 @@ static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
>   * cpumask_test_cpu - test for a cpu in a cpumask
>   * @cpu: cpu number (< nr_cpu_ids)
>   * @cpumask: the cpumask pointer
> + * Returns 1 if 'cpu' is set in 'cpumask', else returns 0
>   *
>   * No static inline type checking - see Subtlety (1) above.
>   */
> @@ -281,6 +282,7 @@ static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
>   * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
>   * @cpu: cpu number (< nr_cpu_ids)
>   * @cpumask: the cpumask pointer
> + * Returns 1 if 'cpu' is set in old bitmap of 'cpumask', else returns 0
>   *
>   * test_and_set_bit wrapper for cpumasks.
>   */
> @@ -293,6 +295,7 @@ static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
>   * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
>   * @cpu: cpu number (< nr_cpu_ids)
>   * @cpumask: the cpumask pointer
> + * Returns 1 if 'cpu' is set in old bitmap of 'cpumask', else returns 0
>   *
>   * test_and_clear_bit wrapper for cpumasks.
>   */
> @@ -324,6 +327,7 @@ static inline void cpumask_clear(struct cpumask *dstp)
>   * @dstp: the cpumask result
>   * @src1p: the first input
>   * @src2p: the second input
> + * If *dstp is empty, returns 0, else returns 1
>   */
>  static inline int cpumask_and(struct cpumask *dstp,
>  			       const struct cpumask *src1p,
> @@ -365,6 +369,7 @@ static inline void cpumask_xor(struct cpumask *dstp,
>   * @dstp: the cpumask result
>   * @src1p: the first input
>   * @src2p: the second input
> + * If *dstp is empty, returns 0, else returns 1
>   */
>  static inline int cpumask_andnot(struct cpumask *dstp,
>  				  const struct cpumask *src1p,
> @@ -414,6 +419,7 @@ static inline bool cpumask_intersects(const struct cpumask *src1p,
>   * cpumask_subset - (*src1p & ~*src2p) == 0
>   * @src1p: the first input
>   * @src2p: the second input
> + * Returns 1 if *src1p is a subset of *src2p, else returns 0
>   */
>  static inline int cpumask_subset(const struct cpumask *src1p,
>  				 const struct cpumask *src2p)


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