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SubjectRe: [PATCH v3] smp: Fix the comments of smp_call_function_many()
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On 2021/12/16 9:01, Randy Dunlap wrote:
> Hi,
>
> On 12/15/21 04:29, 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(). The
>> comments have been simplified slightly to avoid duplication. And the
>> description of other parameters of smp_call_function_many_cond() is added.
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
>> ---
>> kernel/smp.c | 24 +++++++++++++++++-------
>> 1 file changed, 17 insertions(+), 7 deletions(-)
>>
>> v2 --> v3:
>> Add the descrition of other parameters of smp_call_function_many_cond().
>
> description
>
> OK, this patch works (that is, scripts/kernel-doc does not complain).
> However:
>
>>
>> v1 --> v2:
>> Delete some duplicate comments.
>>
>> diff --git a/kernel/smp.c b/kernel/smp.c
>> index 01a7c1706a58b1d..46ef41d6b6f197e 100644
>> --- a/kernel/smp.c
>> +++ b/kernel/smp.c
>> @@ -853,14 +853,26 @@ 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.
>
> The documented character to use after a function name is '-', not ':'. So
>
> * smp_call_function_many_cond() - Run a function on a set of CPUs

OK, I'll modify it, and change ":" to "-" for other functions in kernel/smp.c
with a new patch.

>
> and
>
>> + * @mask: The set of cpus to run on (only runs on online subset).
>> + * Whether to allow execution on the local CPU is also controlled
>> + * by @scf_flags.
>> + * @func: The function to run on all applicable CPUs.
>> + * @info: An arbitrary pointer to pass to @func.
>> + * @scf_flags: Bitmask that controls the operation. Such as SCF_WAIT,
>> + * SCF_RUN_LOCAL.
>> + * @cond_func: A callback function that is passed a cpu id and the info
>> + * parameter. The function should return a blooean value
>> + * indicating whether @func will be executed on the specified CPU.
>> + * If @cond_func is NULL, that means unconditional, always true.
>> + */
>> static void smp_call_function_many_cond(const struct cpumask *mask,
>> smp_call_func_t func, void *info,
>> unsigned int scf_flags,
>> @@ -972,14 +984,12 @@ 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.
>
> * smp_call_function_many() - Run a function on a set of other CPUs.
>
> are preferable.
>
>> * @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.
>> *
>>
>
> thanks.
>

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