rust: kbuild: auto generate helper exports

This removes the need to explicitly export all symbols.

Generate helper exports similarly to what's currently done for Rust
crates. These helpers are exclusively called from within Rust code and
therefore can be treated similar as other Rust symbols.

Signed-off-by: Gary Guo <[email protected]>
Reviewed-by: Boqun Feng <[email protected]>
Tested-by: Boqun Feng <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Fixed dependency path, reworded slightly, edited comment a bit and
  rebased on top of the changes made when applying Andreas' patch
  (e.g. no `README.md` anymore, so moved the edits).  - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

1 files changed, 0 insertions, 3 deletions

diff --git a/rust/helpers/spinlock.c b/rust/helpers/spinlock.c
index 04fd8ddb4986..acc1376b833c 100644
--- a/rust/helpers/spinlock.c
+++ b/rust/helpers/spinlock.c
@@ -12,16 +12,13 @@ void rust_helper___spin_lock_init(spinlock_t *lock, const char *name,
 	spin_lock_init(lock);
 #endif
 }
-EXPORT_SYMBOL_GPL(rust_helper___spin_lock_init);
 
 void rust_helper_spin_lock(spinlock_t *lock)
 {
 	spin_lock(lock);
 }
-EXPORT_SYMBOL_GPL(rust_helper_spin_lock);
 
 void rust_helper_spin_unlock(spinlock_t *lock)
 {
 	spin_unlock(lock);
 }
-EXPORT_SYMBOL_GPL(rust_helper_spin_unlock);