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authorOhhoon Kwon <ohoono.kwon@samsung.com>2021-09-03 00:57:01 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 19:58:14 +0300
commitfc1f5e980a463325cf41d39ac6a69aa3cca73995 (patch)
tree79507c488549d1a0c253e3d2b67d9fb24c093637 /drivers/base
parenta1bc561bb2d3d9b944878955095f53aeba30a166 (diff)
downloadlinux-fc1f5e980a463325cf41d39ac6a69aa3cca73995.tar.xz
mm: sparse: pass section_nr to find_memory_block
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. Link: https://lkml.kernel.org/r/20210707150212.855-3-ohoono.kwon@samsung.com Signed-off-by: Ohhoon Kwon <ohoono.kwon@samsung.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Baoquan He <bhe@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/memory.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index aa31a21f33d7..e3fd2dbf4eea 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -578,9 +578,9 @@ static struct memory_block *find_memory_block_by_id(unsigned long block_id)
/*
* Called under device_hotplug_lock.
*/
-struct memory_block *find_memory_block(struct mem_section *section)
+struct memory_block *find_memory_block(unsigned long section_nr)
{
- unsigned long block_id = memory_block_id(__section_nr(section));
+ unsigned long block_id = memory_block_id(section_nr);
return find_memory_block_by_id(block_id);
}