rust: add support for NUMA ids in allocations

Add a new type to support specifying NUMA identifiers in Rust allocators
and extend the allocators to have NUMA id as a parameter.  Thus, modify
ReallocFunc to use the new extended realloc primitives from the C side of
the kernel (i.e.  k[v]realloc_node_align/vrealloc_node_align) and add the
new function alloc_node to the Allocator trait while keeping the existing
one (alloc) for backward compatibility.

This will allow to specify node to use for allocation of e.  g.  {KV}Box,
as well as for future NUMA aware users of the API.

[ojeda@kernel.org: fix missing import needed for `rusttest`]
  Link: https://lkml.kernel.org/r/20250816210214.2729269-1-ojeda@kernel.org
Link: https://lkml.kernel.org/r/20250806125522.1726992-1-vitaly.wool@konsulko.se
Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.se>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Alice Ryhl <aliceryhl@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jann Horn <jannh@google.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/rust/helpers/vmalloc.c b/rust/helpers/vmalloc.c
index 80d34501bbc0..62d30db9a1a6 100644
--- a/rust/helpers/vmalloc.c
+++ b/rust/helpers/vmalloc.c
@@ -3,7 +3,7 @@
 #include <linux/vmalloc.h>
 
 void * __must_check __realloc_size(2)
-rust_helper_vrealloc(const void *p, size_t size, gfp_t flags)
+rust_helper_vrealloc_node(const void *p, size_t size, gfp_t flags, int node)
 {
-	return vrealloc(p, size, flags);
+	return vrealloc_node(p, size, flags, node);
 }