linux-kernel - [PATCH v6 24/37] rust: Add a rust helper for krealloc()

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Message-ID: <20240321163705.3067592-25-surenb@google.com>
Date: Thu, 21 Mar 2024 09:36:46 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
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Subject: [PATCH v6 24/37] rust: Add a rust helper for krealloc()

From: Kent Overstreet <kent.overstreet@...ux.dev>

Memory allocation profiling is turning krealloc() into a nontrivial
macro - so for now, we need a helper for it.

Until we have proper support on the rust side for memory allocation
profiling this does mean that all Rust allocations will be accounted to
the helper.

Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Miguel Ojeda <ojeda@...nel.org>
Cc: Alex Gaynor <alex.gaynor@...il.com>
Cc: Wedson Almeida Filho <wedsonaf@...il.com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Gary Guo <gary@...yguo.net>
Cc: "Björn Roy Baron" <bjorn3_gh@...tonmail.com>
Cc: Benno Lossin <benno.lossin@...ton.me>
Cc: Andreas Hindborg <a.hindborg@...sung.com>
Cc: Alice Ryhl <aliceryhl@...gle.com>
Cc: rust-for-linux@...r.kernel.org
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Acked-by: Miguel Ojeda <ojeda@...nel.org>
---
 rust/helpers.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/helpers.c b/rust/helpers.c
index 70e59efd92bc..858d802abd11 100644
--- a/rust/helpers.c
+++ b/rust/helpers.c
@@ -28,6 +28,7 @@
 #include <linux/mutex.h>
 #include <linux/refcount.h>
 #include <linux/sched/signal.h>
+#include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
@@ -157,6 +158,13 @@ void rust_helper_init_work_with_key(struct work_struct *work, work_func_t func,
 }
 EXPORT_SYMBOL_GPL(rust_helper_init_work_with_key);
 
+void * __must_check __realloc_size(2)
+rust_helper_krealloc(const void *objp, size_t new_size, gfp_t flags)
+{
+	return krealloc(objp, new_size, flags);
+}
+EXPORT_SYMBOL_GPL(rust_helper_krealloc);
+
 /*
  * `bindgen` binds the C `size_t` type as the Rust `usize` type, so we can
  * use it in contexts where Rust expects a `usize` like slice (array) indices.
-- 
2.44.0.291.gc1ea87d7ee-goog