rust: sync: rcu: Mark Guard methods as inline

Currently the implementation of "Guard" methods are basically wrappers
around rcu's function within kernel. Building the kernel with llvm
18.1.8 on x86_64 machine will generate the following symbols:

$ nm vmlinux | grep ' _R'.*Guard | rustfilt
ffffffff817b6c90 T <kernel::sync::rcu::Guard>::new
ffffffff817b6cb0 T <kernel::sync::rcu::Guard>::unlock
ffffffff817b6cd0 T <kernel::sync::rcu::Guard as core::ops::drop::Drop>::drop
ffffffff817b6c90 T <kernel::sync::rcu::Guard as core::default::Default>::default

These Rust symbols are basically wrappers around functions
"rcu_read_lock" and "rcu_read_unlock". Marking them as inline can
reduce the generation of these symbols, and saves the size of code
generation for 132 bytes.

$ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
(Output is demangled for readability)

add/remove: 0/10 grow/shrink: 0/1 up/down: 0/-132 (-132)
Function                                     old     new   delta
rust_driver_pci::SampleDriver::probe        1041    1034      -7
kernel::sync::rcu::Guard::default             9       -      -9
kernel::sync::rcu::Guard::drop                9       -      -9
kernel::sync::rcu::read_lock                  9       -      -9
kernel::sync::rcu::Guard::unlock              9       -      -9
kernel::sync::rcu::Guard::new                 9       -      -9
__pfx__kernel::sync::rcu::Guard::default     16       -     -16
__pfx__kernel::sync::rcu::Guard::drop        16       -     -16
__pfx__kernel::sync::rcu::read_lock          16       -     -16
__pfx__kernel::sync::rcu::Guard::unlock      16       -     -16
__pfx__kernel::sync::rcu::Guard::new         16       -     -16
Total: Before=23365955, After=23365823, chg -0.00%

Link: Rust-for-Linux#1145
Signed-off-by: I Hsin Cheng <[email protected]>
Reviewed-by: Joel Fernandes <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Reviewed-by: Charalampos Mitrodimas <[email protected]>
Acked-by: Miguel Ojeda <[email protected]>
Signed-off-by: Joel Fernandes <[email protected]>

Author: vax-r

rust/kernel/sync/rcu.rs

@@ -17,6 +17,7 @@ pub struct Guard(NotThreadSafe);
 
 impl Guard {
     /// Acquires the RCU read side lock and returns a guard.
+    #[inline]
     pub fn new() -> Self {
         // SAFETY: An FFI call with no additional requirements.
         unsafe { bindings::rcu_read_lock() };
@@ -25,23 +26,27 @@ impl Guard {
     }
 
     /// Explicitly releases the RCU read side lock.
+    #[inline]
     pub fn unlock(self) {}
 }
 
 impl Default for Guard {
+    #[inline]
     fn default() -> Self {
         Self::new()
     }
 }
 
 impl Drop for Guard {
+    #[inline]
     fn drop(&mut self) {
         // SAFETY: By the type invariants, the RCU read side is locked, so it is ok to unlock it.
         unsafe { bindings::rcu_read_unlock() };
     }
 }
 
 /// Acquires the RCU read side lock.
+#[inline]
 pub fn read_lock() -> Guard {
     Guard::new()
 }