linux-kernel - [PATCH 24/46] rust: mm: add __rust

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Message-ID: <20251202-define-rust-helper-v1-24-a2e13cbc17a6@google.com>
Date: Tue, 02 Dec 2025 19:37:48 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: rust-for-linux@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Alice Ryhl <aliceryhl@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Uladzislau Rezki <urezki@...il.com>, 
	Vitaly Wool <vitaly.wool@...sulko.se>, linux-mm@...ck.org
Subject: [PATCH 24/46] rust: mm: add __rust_helper to helpers

This is needed to inline these helpers into Rust code.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc: Uladzislau Rezki <urezki@...il.com>
Cc: Vitaly Wool <vitaly.wool@...sulko.se>
Cc: linux-mm@...ck.org
---
 rust/helpers/mm.c      | 20 ++++++++++----------
 rust/helpers/page.c    |  9 +++++----
 rust/helpers/vmalloc.c |  7 ++++---
 3 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/rust/helpers/mm.c b/rust/helpers/mm.c
index 81b510c96fd2692dcb7ab4705f790bd3a41a630e..b5540997bd20d4398e2838956ed70b2fb61c5661 100644
--- a/rust/helpers/mm.c
+++ b/rust/helpers/mm.c
@@ -3,48 +3,48 @@
 #include <linux/mm.h>
 #include <linux/sched/mm.h>
 
-void rust_helper_mmgrab(struct mm_struct *mm)
+__rust_helper void rust_helper_mmgrab(struct mm_struct *mm)
 {
 	mmgrab(mm);
 }
 
-void rust_helper_mmdrop(struct mm_struct *mm)
+__rust_helper void rust_helper_mmdrop(struct mm_struct *mm)
 {
 	mmdrop(mm);
 }
 
-void rust_helper_mmget(struct mm_struct *mm)
+__rust_helper void rust_helper_mmget(struct mm_struct *mm)
 {
 	mmget(mm);
 }
 
-bool rust_helper_mmget_not_zero(struct mm_struct *mm)
+__rust_helper bool rust_helper_mmget_not_zero(struct mm_struct *mm)
 {
 	return mmget_not_zero(mm);
 }
 
-void rust_helper_mmap_read_lock(struct mm_struct *mm)
+__rust_helper void rust_helper_mmap_read_lock(struct mm_struct *mm)
 {
 	mmap_read_lock(mm);
 }
 
-bool rust_helper_mmap_read_trylock(struct mm_struct *mm)
+__rust_helper bool rust_helper_mmap_read_trylock(struct mm_struct *mm)
 {
 	return mmap_read_trylock(mm);
 }
 
-void rust_helper_mmap_read_unlock(struct mm_struct *mm)
+__rust_helper void rust_helper_mmap_read_unlock(struct mm_struct *mm)
 {
 	mmap_read_unlock(mm);
 }
 
-struct vm_area_struct *rust_helper_vma_lookup(struct mm_struct *mm,
-					      unsigned long addr)
+__rust_helper struct vm_area_struct *
+rust_helper_vma_lookup(struct mm_struct *mm, unsigned long addr)
 {
 	return vma_lookup(mm, addr);
 }
 
-void rust_helper_vma_end_read(struct vm_area_struct *vma)
+__rust_helper void rust_helper_vma_end_read(struct vm_area_struct *vma)
 {
 	vma_end_read(vma);
 }
diff --git a/rust/helpers/page.c b/rust/helpers/page.c
index 7144de5a61dbdb3006a668961cd1b09440e74908..f8463fbed2a2670ddfd4c23dc922b46b0913c3a2 100644
--- a/rust/helpers/page.c
+++ b/rust/helpers/page.c
@@ -4,23 +4,24 @@
 #include <linux/highmem.h>
 #include <linux/mm.h>
 
-struct page *rust_helper_alloc_pages(gfp_t gfp_mask, unsigned int order)
+__rust_helper struct page *rust_helper_alloc_pages(gfp_t gfp_mask,
+						   unsigned int order)
 {
 	return alloc_pages(gfp_mask, order);
 }
 
-void *rust_helper_kmap_local_page(struct page *page)
+__rust_helper void *rust_helper_kmap_local_page(struct page *page)
 {
 	return kmap_local_page(page);
 }
 
-void rust_helper_kunmap_local(const void *addr)
+__rust_helper void rust_helper_kunmap_local(const void *addr)
 {
 	kunmap_local(addr);
 }
 
 #ifndef NODE_NOT_IN_PAGE_FLAGS
-int rust_helper_page_to_nid(const struct page *page)
+__rust_helper int rust_helper_page_to_nid(const struct page *page)
 {
 	return page_to_nid(page);
 }
diff --git a/rust/helpers/vmalloc.c b/rust/helpers/vmalloc.c
index 7d7f7336b3d2f5a32e6a2b6cf8407da37775cfd9..469ebf2f41c94744e2a2719d7c0eb7d4d7dc58ff 100644
--- a/rust/helpers/vmalloc.c
+++ b/rust/helpers/vmalloc.c
@@ -2,9 +2,10 @@
 
 #include <linux/vmalloc.h>
 
-void * __must_check __realloc_size(2)
-rust_helper_vrealloc_node_align(const void *p, size_t size, unsigned long align,
-				gfp_t flags, int node)
+__rust_helper void *__must_check __realloc_size(2)
+	rust_helper_vrealloc_node_align(const void *p, size_t size,
+					unsigned long align, gfp_t flags,
+					int node)
 {
 	return vrealloc_node_align(p, size, align, flags, node);
 }

-- 
2.52.0.158.g65b55ccf14-goog