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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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5
mm/vmalloc.c
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@ -396,9 +396,8 @@ compute_subtree_max_size(struct vmap_area *va)
get_subtree_max_size(va->rb_node.rb_right));
}
RB_DECLARE_CALLBACKS(static, free_vmap_area_rb_augment_cb,
struct vmap_area, rb_node, unsigned long, subtree_max_size,
compute_subtree_max_size)
RB_DECLARE_CALLBACKS_MAX(static, free_vmap_area_rb_augment_cb,
struct vmap_area, rb_node, unsigned long, subtree_max_size, va_size)
static void purge_vmap_area_lazy(void);
static BLOCKING_NOTIFIER_HEAD(vmap_notify_list);