The patch titled
Subject: maple_tree: mark three functions as __maybe_unused
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-mark-three-functions-as-__maybe_unused.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-mark-three-functions-as-__maybe_unused.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: maple_tree: mark three functions as __maybe_unused
Date: Fri, 6 Sep 2024 22:15:06 -0400
People keep trying to remove three functions that are going to be used in
a feature that is being developed. Dropping the functions entirely may
end up with people trying to use the bit for other uses, as people have
tried in the past.
Adding __maybe_unused stops compilers complaining about the unused
functions so they can be silently optimised out of the compiled code and
people won't try to claim the bit for another use.
Link: https://lore.kernel.org/all/20230726080916.17454-2-zhangpeng.00@xxxxxxxxxxxxx/
Link: https://lore.kernel.org/all/202408310728.S7EE59BN-lkp@xxxxxxxxx/
Link: https://lkml.kernel.org/r/20240907021506.4018676-1-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/lib/maple_tree.c~maple_tree-mark-three-functions-as-__maybe_unused
+++ a/lib/maple_tree.c
@@ -348,17 +348,17 @@ static inline void *mte_safe_root(const
return (void *)((unsigned long)node & ~MAPLE_ROOT_NODE);
}
-static inline void *mte_set_full(const struct maple_enode *node)
+static inline void __maybe_unused *mte_set_full(const struct maple_enode *node)
{
return (void *)((unsigned long)node & ~MAPLE_ENODE_NULL);
}
-static inline void *mte_clear_full(const struct maple_enode *node)
+static inline void __maybe_unused *mte_clear_full(const struct maple_enode *node)
{
return (void *)((unsigned long)node | MAPLE_ENODE_NULL);
}
-static inline bool mte_has_null(const struct maple_enode *node)
+static inline bool __maybe_unused mte_has_null(const struct maple_enode *node)
{
return (unsigned long)node & MAPLE_ENODE_NULL;
}
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
mm-damon-vaddr-protect-vma-traversal-in-__damon_va_thre_regions-with-rcu-read-lock.patch
maple_tree-mark-three-functions-as-__maybe_unused.patch
