diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 34415ae1af1b57b661c752f0d1419c984f9e34bb..19c286c23786f17e73c5f2bf2790aa2c3da4dd4d 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -32,6 +32,7 @@ you probably needn't concern yourself with pcmciautils.
 GNU C                  5.1              gcc --version
 Clang/LLVM (optional)  11.0.0           clang --version
 GNU make               3.81             make --version
+bash                   4.2              bash --version
 binutils               2.23             ld -v
 flex                   2.5.35           flex --version
 bison                  2.0              bison --version
@@ -84,6 +85,12 @@ Make
 
 You will need GNU make 3.81 or later to build the kernel.
 
+Bash
+----
+
+Some bash scripts are used for the kernel build.
+Bash 4.2 or newer is needed.
+
 Binutils
 --------
 
@@ -362,6 +369,11 @@ Make
 
 - <ftp://ftp.gnu.org/gnu/make/>
 
+Bash
+----
+
+- <ftp://ftp.gnu.org/gnu/bash/>
+
 Binutils
 --------
 
diff --git a/scripts/check-local-export b/scripts/check-local-export
index da745e2743b74dfd6da62a943ceef6b73bbf8044..6ccc2f4674166c2b22d22cf04e9d0c34224a5151 100755
--- a/scripts/check-local-export
+++ b/scripts/check-local-export
@@ -8,11 +8,31 @@
 
 set -e
 
+# catch errors from ${NM}
+set -o pipefail
+
+# Run the last element of a pipeline in the current shell.
+# Without this, the while-loop would be executed in a subshell, and
+# the changes made to 'symbol_types' and 'export_symbols' would be lost.
+shopt -s lastpipe
+
 declare -A symbol_types
 declare -a export_symbols
 
 exit_code=0
 
+# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm) shows
+# 'no symbols' diagnostic (but exits with 0). It is harmless and hidden by
+# '2>/dev/null'. However, it suppresses real error messages as well. Add a
+# hand-crafted error message here.
+#
+# TODO:
+# Use --quiet instead of 2>/dev/null when we upgrade the minimum version of
+# binutils to 2.37, llvm to 13.0.0.
+# Then, the following line will be really simple:
+#   ${NM} --quiet ${1} |
+
+{ ${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; false; } } |
 while read value type name
 do
 	# Skip the line if the number of fields is less than 3.
@@ -37,21 +57,7 @@ do
 	if [[ ${name} == __ksymtab_* ]]; then
 		export_symbols+=(${name#__ksymtab_})
 	fi
-
-	# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm)
-	# shows 'no symbols' diagnostic (but exits with 0). It is harmless and
-	# hidden by '2>/dev/null'. However, it suppresses real error messages
-	# as well. Add a hand-crafted error message here.
-	#
-	# Use --quiet instead of 2>/dev/null when we upgrade the minimum version
-	# of binutils to 2.37, llvm to 13.0.0.
-	#
-	# Then, the following line will be really simple:
-	#   done < <(${NM} --quiet ${1})
-done < <(${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; false; } )
-
-# Catch error in the process substitution
-wait $!
+done
 
 for name in "${export_symbols[@]}"
 do