doc kernel: atomics: support for 64-bit atomic operations

cfriedt · Christopher Friedt · commit 653ca0e66522 · 2022-07-21T13:47:16.000-04:00
By redefining `atomic_t` as `long`, the type is 32-bit on
32-bit architectures and 64-bit on 64-bit architectures.

Signed-off-by: Christopher Friedt &lt;chrisfriedt@gmail.com&gt;
diff --git a/doc/reference/kernel/other/atomic.rst b/doc/reference/kernel/other/atomic.rst
@@ -3,8 +3,9 @@
 Atomic Services
 ###############
 
-An :dfn:`atomic variable` is a 32-bit variable that can be read and modified
-by threads and ISRs in an uninterruptible manner.
+An :dfn:`atomic variable` is one that can be read and modified
+by threads and ISRs in an uninterruptible manner. It 32-bit on
+32-bit machines and 64-bit on 64-bit machines.
 
 .. contents::
     :local:
