On 7/28/24 18:13, Mike Rapoport wrote:
> On Fri, Jul 26, 2024 at 04:10:23PM +0900, Leesoo Ahn wrote:
>> sparse_buffer_fini(..) takes the following actions even though the value of
>> sparsemap_buf is NULL,
>> 1. calculate size of sparsemap buffer (which is meaningless).
>> 2. set sparsemap_buf variable to NULL (although it is already NULL).
>>
>> These steps are unnecessary if the variable, sparsemap_buf is NULL.
>>
>> Refactor the function to return right away if the variable is NULL.
>> Hence, it doesn't need to take further actions.
>
> sparse_buffer_fini() is called a few times on init so saving a jump (if at
> all) does not worth the churn.
Agreed, this is not worth the churn given there could be just a single
call instance for sparse_buffer_fini(), either in normal or error path
in sparse_init_nid().
>
>> Signed-off-by: Leesoo Ahn <lsahn@xxxxxxxxxx>
>> ---
>> mm/sparse.c | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/mm/sparse.c b/mm/sparse.c
>> index e4b830091d13..091e4bc2f72c 100644
>> --- a/mm/sparse.c
>> +++ b/mm/sparse.c
>> @@ -469,9 +469,13 @@ static void __init sparse_buffer_init(unsigned long size, int nid)
>>
>> static void __init sparse_buffer_fini(void)
>> {
>> - unsigned long size = sparsemap_buf_end - sparsemap_buf;
>> + unsigned long size;
>>
>> - if (sparsemap_buf && size > 0)
>> + if (!sparsemap_buf)
>> + return;
>> +
>> + size = sparsemap_buf_end - sparsemap_buf;
>> + if (size > 0)
>> sparse_buffer_free(size);
>> sparsemap_buf = NULL;
>> }
>> --
>> 2.34.1
>>
>>
>
