vfs-7.0-rc1.rust

Please consider pulling these changes from the signed vfs-7.0-rc1.rust tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.0-rc1.rust' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs rust updates from Christian Brauner:
 "Allow inlining C helpers into Rust when using LTO: Add the
  __rust_helper annotation to all VFS-related Rust helper functions.

  Currently, C helpers cannot be inlined into Rust code even under LTO
  because LLVM detects slightly different codegen options between the C
  and Rust compilation units (differing null-pointer-check flags,
  builtin lists, and target feature strings). The __rust_helper macro is
  the first step toward fixing this: it is currently #defined to
  nothing, but a follow-up series will change it to __always_inline when
  compiling with LTO (while keeping it empty for bindgen, which ignores
  inline functions).

  This picks up the VFS portion (fs, pid_namespace, poll) of a larger
  tree-wide series"

* tag 'vfs-7.0-rc1.rust' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  rust: poll: add __rust_helper to helpers
  rust: pid_namespace: add __rust_helper to helpers
  rust: fs: add __rust_helper to helpers

rust/helpers/fs.c

@@ -6,7 +6,7 @@
 
 #include <linux/fs.h>
 
-struct file *rust_helper_get_file(struct file *f)
+__rust_helper struct file *rust_helper_get_file(struct file *f)
 {
 	return get_file(f);
 }

rust/helpers/pid_namespace.c

@@ -3,18 +3,20 @@
 #include <linux/pid_namespace.h>
 #include <linux/cleanup.h>
 
-struct pid_namespace *rust_helper_get_pid_ns(struct pid_namespace *ns)
+__rust_helper struct pid_namespace *
+rust_helper_get_pid_ns(struct pid_namespace *ns)
 {
 	return get_pid_ns(ns);
 }
 
-void rust_helper_put_pid_ns(struct pid_namespace *ns)
+__rust_helper void rust_helper_put_pid_ns(struct pid_namespace *ns)
 {
 	put_pid_ns(ns);
 }
 
 /* Get a reference on a task's pid namespace. */
-struct pid_namespace *rust_helper_task_get_pid_ns(struct task_struct *task)
+__rust_helper struct pid_namespace *
+rust_helper_task_get_pid_ns(struct task_struct *task)
 {
 	struct pid_namespace *pid_ns;
 

rust/helpers/poll.c

@@ -3,8 +3,9 @@
 #include <linux/export.h>
 #include <linux/poll.h>
 
-void rust_helper_poll_wait(struct file *filp, wait_queue_head_t *wait_address,
-			   poll_table *p)
+__rust_helper void rust_helper_poll_wait(struct file *filp,
+					 wait_queue_head_t *wait_address,
+					 poll_table *p)
 {
 	poll_wait(filp, wait_address, p);
 }