linux-kernel - [PATCH 0/3] mm: sparse: remove __section

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Message-Id: <20210702094132.6276-1-ohoono.kwon@samsung.com>
Date:   Fri,  2 Jul 2021 18:41:29 +0900
From:   Ohhoon Kwon <ohoono.kwon@...sung.com>
To:     david@...hat.com, ohoono.kwon@...sung.com,
        akpm@...ux-foundation.org, mhocko@...e.com
Cc:     bhe@...hat.com, rppt@...ux.ibm.com, ohkwon1043@...il.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] mm: sparse: remove __section_nr() function

This series contains cleanups to remove __section_nr().

When CONFIG_SPARSEMEM_EXTREME is enabled, __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).

The only users of __section_nr() was section_mark_present() and
find_memory_block().

PATCH 1 & 2 changes both functions to use section_nr instead of
mem_section.
PATCH 3 finally removes __section_nr() function.

More details can be found in each changelogs.

Ohhoon Kwon (3):
  mm: sparse: pass section_nr to section_mark_present
  mm: sparse: pass section_nr to find_memory_block
  mm: sparse: remove __section_nr() function

 .../platforms/pseries/hotplug-memory.c        |  4 +--
 drivers/base/memory.c                         |  4 +--
 include/linux/memory.h                        |  2 +-
 include/linux/mmzone.h                        |  1 -
 mm/sparse.c                                   | 35 +++----------------
 5 files changed, 9 insertions(+), 37 deletions(-)

-- 
2.17.1