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SubjectRe: [PATCH 2/3] mm: sparse: pass section_nr to find_memory_block
On 02.07.21 11:41, Ohhoon Kwon wrote:
> With CONFIG_SPARSEMEM_EXTREME enabled, __section_nr() which converts
> mem_section to section_nr could be costly since it iterates all
> section roots to check if the given mem_section is in its range.
> On the other hand, __nr_to_section() which converts section_nr to
> mem_section can be done in O(1).
> Let's pass section_nr instead of mem_section ptr to
> find_memory_block() in order to reduce needless iterations.
> Signed-off-by: Ohhoon Kwon <>

Reviewed-by: David Hildenbrand <>


David / dhildenb

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