diff -drupN a/fs/proc/Kconfig b/fs/proc/Kconfig
--- a/fs/proc/Kconfig	2018-08-06 17:23:04.000000000 +0300
+++ b/fs/proc/Kconfig	2022-06-12 05:28:14.000000000 +0300
@@ -1,6 +1,7 @@
 config PROC_FS
 	bool "/proc file system support" if EXPERT
 	default y
+	select FLEX_ARRAY
 	help
 	  This is a virtual file system providing information about the status
 	  of the system. "Virtual" means that it doesn't take up any space on
@@ -81,3 +82,10 @@ config PROC_CHILDREN
 
 	  Say Y if you are running any user-space software which takes benefit from
 	  this interface. For example, rkt is such a piece of software.
+
+config PROC_UID
+	bool "Include /proc/uid/ files"
+	default y
+	depends on PROC_FS && RT_MUTEXES
+	help
+	Provides aggregated per-uid information under /proc/uid.