[PATCH v2] powerpc/kdump: Add support for crashkernel CMA reservation

[Sourabh Jain]

On 23/10/25 20:53, Jiri Bohac wrote:
> On Thu, Oct 23, 2025 at 05:44:12PM +0530, Sourabh Jain wrote:
>> @@ -595,6 +602,13 @@ int get_crash_memory_ranges(struct crash_mem **mem_ranges)
>>   	if (ret)
>>   		goto out;
>>   
>> +	for (i = 0; i < crashk_cma_cnt; ++i) {
>> +		ret = crash_exclude_mem_range(tmem, crashk_cma_ranges[i].start,
>> +					      crashk_cma_ranges[i].end);
>> +		if (ret)
>> +			goto out;
>> +	}
>> +
> I think the loop needs to check if tmem->nr_ranges == tmem->max_nr_ranges and
> reallocate in each iteration, just like it's done when excluding the crashk_res
> region above:

Yeah, nice catch. I thought it would get adjusted automatically, as it is
done in the add_mem_range function.

Thanks for the review. I will update the patch and send v3.

>          /* Reallocate memory ranges if there is no space to split ranges */
>          tmem = *mem_ranges;
>          if (tmem && (tmem->nr_ranges == tmem->max_nr_ranges)) {
>                  tmem = realloc_mem_ranges(mem_ranges);
>                  if (!tmem)
>                          goto out;
>          }
>
>          /* Exclude crashkernel region */
>          ret = crash_exclude_mem_range(tmem, crashk_res.start, crashk_res.end);
>          if (ret)
>                  goto out;
>
>
>