linux-kernel - [PATCH 0/2] some cleanups related to RB_DECLARE_CALLBACKS

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Date:   Sun, 11 Aug 2019 20:46:11 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Michel Lespinasse <walken@...gle.com>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Roman Gushchin <guro@...com>,
        Uladzislau Rezki <urezki@...il.com>,
        Hillf Danton <hdanton@...a.com>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 0/2] some cleanups related to RB_DECLARE_CALLBACKS_MAX

Recently we have got RB_DECLARE_CALLBACKS_MAX template that is supposed
to be used in case of having an augmented value as scalar value. First
patch just simplifies the *_compute_max() callback by using max3()
macro that makes the code more transparent, i think. No functional changes.

Second patch reuses RB_DECLARE_CALLBACKS_MAX template's internal functionality,
that is generated to manage augment red-black tree instead of using our own and
the same logic in vmalloc. Just get rid of duplication. No functional changes.

Also i have open question related to validating of the augment tree, i mean
in case of debugging to check that nodes are maintained correctly. Please
have a look here: https://lkml.org/lkml/2019/7/29/304

Basically we can add one more function under RB_DECLARE_CALLBACKS_MAX template
making it public that checks a tree and its augmented nodes. At least i see
two users where it can be used: vmalloc and lib/rbtree_test.c.

Appreciate for any comments.

Uladzislau Rezki (Sony) (2):
  augmented rbtree: use max3() in the *_compute_max() function
  mm/vmalloc: use generated callback to populate subtree_max_size

 include/linux/rbtree_augmented.h       | 40 +++++++++++++++++-----------------
 mm/vmalloc.c                           | 31 +-------------------------
 tools/include/linux/rbtree_augmented.h | 40 +++++++++++++++++-----------------
 3 files changed, 41 insertions(+), 70 deletions(-)

-- 
2.11.0