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augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macro

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Add RB_DECLARE_CALLBACKS_MAX, which generates augmented rbtree callbacks
for the case where the augmented value is a scalar whose definition
follows a max(f(node)) pattern.  This actually covers all present uses of
RB_DECLARE_CALLBACKS, and saves some (source) code duplication in the
various RBCOMPUTE function definitions.

[[email protected]: fix mm/vmalloc.c]
  Link: http://lkml.kernel.org/r/CANN689FXgK13wDYNh1zKxdipeTuALG4eKvKpsdZqKFJ-rvtGiQ@mail.gmail.com
[[email protected]: re-add check to check_augmented()]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michel Lespinasse <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: David Howells <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Uladzislau Rezki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michel Lespinasse 2019-09-25 16:46:07 -07:00 • committed by Linus Torvalds
commit 315cc066b8
8 changed files with 115 additions and 98 deletions
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29
drivers/block/drbd/drbd_interval.c
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@ -13,33 +13,10 @@ sector_t interval_end(struct rb_node *node)
return this->end;
}
/**
* compute_subtree_last - compute end of @node
*
* The end of an interval is the highest (start + (size >> 9)) value of this
* node and of its children. Called for @node and its parents whenever the end
* may have changed.
*/
static inline sector_t
compute_subtree_last(struct drbd_interval *node)
{
sector_t max = node->sector + (node->size >> 9);
#define NODE_END(node) ((node)->sector + ((node)->size >> 9))
if (node->rb.rb_left) {
sector_t left = interval_end(node->rb.rb_left);
if (left > max)
max = left;
}
if (node->rb.rb_right) {
sector_t right = interval_end(node->rb.rb_right);
if (right > max)
max = right;
}
return max;
}
RB_DECLARE_CALLBACKS(static, augment_callbacks, struct drbd_interval, rb,
sector_t, end, compute_subtree_last);
RB_DECLARE_CALLBACKS_MAX(static, augment_callbacks,
struct drbd_interval, rb, sector_t, end, NODE_END);
/**
* drbd_insert_interval - insert a new interval into a tree