]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
mm: sparse: pass section_nr to find_memory_block
authorOhhoon Kwon <ohoono.kwon@samsung.com>
Thu, 2 Sep 2021 21:57:01 +0000 (14:57 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 3 Sep 2021 16:58:14 +0000 (09:58 -0700)
commitfc1f5e980a463325cf41d39ac6a69aa3cca73995
tree79507c488549d1a0c253e3d2b67d9fb24c093637
parenta1bc561bb2d3d9b944878955095f53aeba30a166
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>
arch/powerpc/platforms/pseries/hotplug-memory.c
drivers/base/memory.c
include/linux/memory.h