Re: [PATCH v2] smp: Fix the comments of smp_call_function_many()

[Randy Dunlap <rdunlap@infradead.org>]

Hi,

On 12/14/21 00:10, Zhen Lei wrote:
> As commit a32a4d8a815c ("smp: Run functions concurrently in
> smp_call_function_many_cond()") itself says:
>                   "Keep other smp_call_function_many() semantic as it is
> today for backward compatibility: the called function is not executed in
> this case locally."
> 
> It's clear that, the function header comments of smp_call_function_many()
> does not need to be changed.
> 
> So move the comment about 'scf_flags' to smp_call_function_many_cond(),
> and restore the original comments of smp_call_function_many().
> 
> Finally, the comments have been simplified slightly to avoid duplication.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
> ---
>  kernel/smp.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> v1 --> v2:
> Delete some duplicate comments.
> 
> diff --git a/kernel/smp.c b/kernel/smp.c
> index 01a7c1706a58b1d..9cbe2509d1010ea 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c
> @@ -853,14 +853,17 @@ int smp_call_function_any(const struct cpumask *mask,
>  EXPORT_SYMBOL_GPL(smp_call_function_any);
>  
>  /*
> - * Flags to be used as scf_flags argument of smp_call_function_many_cond().
> - *
>   * %SCF_WAIT:		Wait until function execution is completed
>   * %SCF_RUN_LOCAL:	Run also locally if local cpu is set in cpumask
>   */
>  #define SCF_WAIT	(1U << 0)
>  #define SCF_RUN_LOCAL	(1U << 1)
>  
> +/**
> + * smp_call_function_many_cond(): Run a function on a set of CPUs.
> + * @scf_flags: Bitmask that controls the operation. Such as SCF_WAIT,
> + *             SCF_RUN_LOCAL.
> + */
>  static void smp_call_function_many_cond(const struct cpumask *mask,
>  					smp_call_func_t func, void *info,
>  					unsigned int scf_flags,
> @@ -972,14 +975,12 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
>  }
>  
>  /**
> - * smp_call_function_many(): Run a function on a set of CPUs.
> + * smp_call_function_many(): Run a function on a set of other CPUs.
>   * @mask: The set of cpus to run on (only runs on online subset).
>   * @func: The function to run. This must be fast and non-blocking.
>   * @info: An arbitrary pointer to pass to the function.
> - * @wait: Bitmask that controls the operation. If %SCF_WAIT is set, wait
> - *        (atomically) until function has completed on other CPUs. If
> - *        %SCF_RUN_LOCAL is set, the function will also be run locally
> - *        if the local CPU is set in the @cpumask.
> + * @wait: If true, wait (atomically) until function has completed
> + *        on other CPUs.
>   *
>   * If @wait is true, then returns once @func has returned.
>   *

After applying this patch, kernel-doc emits 4 warnings:

smp.c:871: warning: Function parameter or member 'mask' not described in 'smp_call_function_many_cond'
smp.c:871: warning: Function parameter or member 'func' not described in 'smp_call_function_many_cond'
smp.c:871: warning: Function parameter or member 'info' not described in 'smp_call_function_many_cond'
smp.c:871: warning: Function parameter or member 'cond_func' not described in 'smp_call_function_many_cond'


thanks.
-- 
~Randy