Re: [PATCH v4 1/2] memblock: drop for_each_memblock_type() and open code its users

[tarunsahu@google.com]

Mike Rapoport <rppt@kernel.org> writes:

> Hi Tarun,
>
> Please for the next time add the cover-letter when sending more than one
> patch.

Thanks Mike for piking up the patches.

Sure, I will take care of adding the cover-letter.

You had some nit change suggestion, Let me know if you want
me send v5 or it is alright.

~Tarun


>
> On Thu, Oct 08, 2026 at 07:08:27PM +0000, Tarun Sahu wrote:
>> for_each_memblock_type() always starts the iteration at index 0 and its
>> body is a trivial 'for' loop, so it hides very little. It also gets in
>> the way of iterating from an arbitrary index, which the next patch
>> needs.
>> 
>> Remove the macro and open code its three users: memblock_add_range(),
>> memblock_isolate_range() and memblock_dump(). While at it, move the
>> region pointer into the loop body scope.
>> 
>> No functional change.
>> 
>> Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
>> Signed-off-by: Tarun Sahu <tarunsahu@google.com>
>> ---
>>  mm/memblock.c | 17 ++++++-----------
>>  1 file changed, 6 insertions(+), 11 deletions(-)
>> 
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index f5aaa38cfa31..59dda7d085f3 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -155,11 +155,6 @@ struct memblock_type physmem = {
>>   */
>>  static __refdata struct memblock_type *memblock_memory = &memblock.memory;
>>  
>> -#define for_each_memblock_type(i, memblock_type, rgn)			\
>> -	for (i = 0, rgn = &memblock_type->regions[0];			\
>> -	     i < memblock_type->cnt;					\
>> -	     i++, rgn = &memblock_type->regions[i])
>> -
>>  #define memblock_dbg(fmt, ...)						\
>>  	do {								\
>>  		if (memblock_debug)					\
>> @@ -615,7 +610,6 @@ static int __init_memblock memblock_add_range(struct memblock_type *type,
>>  	phys_addr_t obase = base;
>>  	phys_addr_t end = base + memblock_cap_size(base, &size);
>>  	int idx, nr_new, start_rgn = -1, end_rgn;
>> -	struct memblock_region *rgn;
>>  
>>  	if (!size)
>>  		return 0;
>> @@ -651,7 +645,8 @@ static int __init_memblock memblock_add_range(struct memblock_type *type,
>>  	base = obase;
>>  	nr_new = 0;
>>  
>> -	for_each_memblock_type(idx, type, rgn) {
>> +	for (idx = 0; idx < type->cnt; idx++) {
>> +		struct memblock_region *rgn = &type->regions[idx];
>>  		phys_addr_t rbase = rgn->base;
>>  		phys_addr_t rend = rbase + rgn->size;
>>  
>> @@ -815,7 +810,6 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
>>  {
>>  	phys_addr_t end = base + memblock_cap_size(base, &size);
>>  	int idx;
>> -	struct memblock_region *rgn;
>>  
>>  	*start_rgn = *end_rgn = 0;
>>  
>> @@ -827,7 +821,8 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
>>  		if (memblock_double_array(type, base, size) < 0)
>>  			return -ENOMEM;
>>  
>> -	for_each_memblock_type(idx, type, rgn) {
>> +	for (idx = 0; idx < type->cnt; idx++) {
>> +		struct memblock_region *rgn = &type->regions[idx];
>>  		phys_addr_t rbase = rgn->base;
>>  		phys_addr_t rend = rbase + rgn->size;
>>  
>> @@ -2194,11 +2189,11 @@ static void __init_memblock memblock_dump(struct memblock_type *type)
>>  	phys_addr_t base, end, size;
>>  	enum memblock_flags flags;
>>  	int idx;
>> -	struct memblock_region *rgn;
>>  
>>  	pr_info(" %s.cnt  = 0x%lx\n", type->name, type->cnt);
>>  
>> -	for_each_memblock_type(idx, type, rgn) {
>> +	for (idx = 0; idx < type->cnt; idx++) {
>> +		struct memblock_region *rgn = &type->regions[idx];
>>  		char nid_buf[32] = "";
>>  
>>  		base = rgn->base;
>> -- 
>> 2.56.0.385.gd3acb90ef8-goog
>> 
>
> -- 
> Sincerely yours,
> Mike.