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Message-ID: <o2vlyvq53kciyc5vhm7jgrvormdw6oyqmsnzbgagiq4niuurop@n3xa7p7ti7xq>
Date: Wed, 3 Sep 2025 14:00:54 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Danilo Krummrich <dakr@...nel.org>, maple-tree@...ts.infradead.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] maple_tree: remove lockdep_map_p typedef
* Alice Ryhl <aliceryhl@...gle.com> [250902 04:36]:
> Having the ma_external_lock field exist when CONFIG_LOCKDEP=n isn't used
> anywhere, so just get rid of it. This also avoids generating a typedef
> called lockdep_map_p that could overlap with typedefs in other header
> files.
>
> Reviewed-by: Danilo Krummrich <dakr@...nel.org>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
If it helps you then let's do it this way. I don't think there's much
risk leaving it the way it is, but there's not much risk changing it
either.
Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> ---
> Originally sent as
> https://lore.kernel.org/all/20250819-maple-tree-v2-1-229b48657bab@google.com/
>
> But I'm moving it out of that series as it did not have the intended
> effect on the Rust bindgen output. However, I still think it makes sense
> as a pure cleanup patch.
> ---
> include/linux/maple_tree.h | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
> index bafe143b1f783202e27b32567fffee4149e8e266..8244679ba1758235e049acbaedee62aae5c0e226 100644
> --- a/include/linux/maple_tree.h
> +++ b/include/linux/maple_tree.h
> @@ -194,7 +194,6 @@ enum store_type {
> #define MAPLE_RESERVED_RANGE 4096
>
> #ifdef CONFIG_LOCKDEP
> -typedef struct lockdep_map *lockdep_map_p;
> #define mt_lock_is_held(mt) \
> (!(mt)->ma_external_lock || lock_is_held((mt)->ma_external_lock))
>
> @@ -207,7 +206,6 @@ typedef struct lockdep_map *lockdep_map_p;
>
> #define mt_on_stack(mt) (mt).ma_external_lock = NULL
> #else
> -typedef struct { /* nothing */ } lockdep_map_p;
> #define mt_lock_is_held(mt) 1
> #define mt_write_lock_is_held(mt) 1
> #define mt_set_external_lock(mt, lock) do { } while (0)
> @@ -230,8 +228,10 @@ typedef struct { /* nothing */ } lockdep_map_p;
> */
> struct maple_tree {
> union {
> - spinlock_t ma_lock;
> - lockdep_map_p ma_external_lock;
> + spinlock_t ma_lock;
> +#ifdef CONFIG_LOCKDEP
> + struct lockdep_map *ma_external_lock;
> +#endif
> };
> unsigned int ma_flags;
> void __rcu *ma_root;
>
> ---
> base-commit: 1b237f190eb3d36f52dffe07a40b5eb210280e00
> change-id: 20250902-maple-lockdep-p-a930e865c76b
>
> Best regards,
> --
> Alice Ryhl <aliceryhl@...gle.com>
>
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