--- /dev/null
+commit efd08bfa0adab3ae299be7abdd45161a15804a3b
+Author: Denys Vlasenko <vda.linux@googlemail.com>
+Date: Wed Oct 19 17:54:42 2011 +0200
+
+ gen_build_files: don't pass 200k+ strings as params. Closes 4321
+
+ Also removes one grep per generated file.
+
+ Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
+
+diff --git a/scripts/gen_build_files.sh b/scripts/gen_build_files.sh
+index e518a90..1a3d3e9 100755
+--- a/scripts/gen_build_files.sh
++++ b/scripts/gen_build_files.sh
+@@ -19,25 +19,20 @@ chk() { status "CHK" "$@"; }
+
+ generate()
+ {
+- local src="$1" dst="$2" header="$3" insert="$4"
++ # NB: data to be inserted at INSERT line is coming on stdin
++ local src="$1" dst="$2" header="$3"
+ #chk "${dst}"
+- (
++ {
+ # Need to use printf: different shells have inconsistent
+- # rules re handling of "\n" in echo params,
+- # and ${insert} definitely contains "\n".
+- # Therefore, echo "${header}" would not work:
++ # rules re handling of "\n" in echo params.
+ printf "%s\n" "${header}"
+- if grep -qs '^INSERT$' "${src}"; then
+- sed -n '1,/^INSERT$/p' "${src}"
+- printf "%s\n" "${insert}"
+- sed -n '/^INSERT$/,$p' "${src}"
+- else
+- if [ -n "${insert}" ]; then
+- printf "%s\n" "ERROR: INSERT line missing in: ${src}" 1>&2
+- fi
+- cat "${src}"
+- fi
+- ) | sed '/^INSERT$/d' > "${dst}.tmp"
++ # print everything up to INSERT line
++ sed -n '/^INSERT$/q;1,/^INSERT$/p' "${src}"
++ # copy stdin to stdout
++ cat
++ # print everything after INSERT line
++ sed -n '/^INSERT$/{:l;n;p;bl}' "${src}"
++ } >"${dst}.tmp"
+ if ! cmp -s "${dst}" "${dst}.tmp"; then
+ gen "${dst}"
+ mv "${dst}.tmp" "${dst}"
+@@ -47,24 +42,21 @@ generate()
+ }
+
+ # (Re)generate include/applets.h
+-s=`sed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c`
+-generate \
++sed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c \
++| generate \
+ "$srctree/include/applets.src.h" \
+ "include/applets.h" \
+- "/* DO NOT EDIT. This file is generated from applets.src.h */" \
+- "${s}"
++ "/* DO NOT EDIT. This file is generated from applets.src.h */"
+
+ # (Re)generate include/usage.h
+ # We add line continuation backslash after each line,
+ # and insert empty line before each line which doesn't start
+ # with space or tab
+-# (note: we need to use \\\\ because of ``)
+-s=`sed -n -e 's@^//usage:\([ \t].*\)$@\1 \\\\@p' -e 's@^//usage:\([^ \t].*\)$@\n\1 \\\\@p' "$srctree"/*/*.c "$srctree"/*/*/*.c`
+-generate \
++sed -n -e 's@^//usage:\([ \t].*\)$@\1 \\@p' -e 's@^//usage:\([^ \t].*\)$@\n\1 \\@p' "$srctree"/*/*.c "$srctree"/*/*/*.c \
++| generate \
+ "$srctree/include/usage.src.h" \
+ "include/usage.h" \
+- "/* DO NOT EDIT. This file is generated from usage.src.h */" \
+- "${s}"
++ "/* DO NOT EDIT. This file is generated from usage.src.h */"
+
+ # (Re)generate */Kbuild and */Config.in
+ { cd -- "$srctree" && find . -type d; } | while read -r d; do
+@@ -75,11 +67,10 @@ generate \
+ if test -f "$src"; then
+ mkdir -p -- "$d" 2>/dev/null
+
+- s=`sed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c`
+- generate \
++ sed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c \
++ | generate \
+ "${src}" "${dst}" \
+- "# DO NOT EDIT. This file is generated from Kbuild.src" \
+- "${s}"
++ "# DO NOT EDIT. This file is generated from Kbuild.src"
+ fi
+
+ src="$srctree/$d/Config.src"
+@@ -87,11 +78,10 @@ generate \
+ if test -f "$src"; then
+ mkdir -p -- "$d" 2>/dev/null
+
+- s=`sed -n 's@^//config:@@p' "$srctree/$d"/*.c`
+- generate \
++ sed -n 's@^//config:@@p' "$srctree/$d"/*.c \
++ | generate \
+ "${src}" "${dst}" \
+- "# DO NOT EDIT. This file is generated from Config.src" \
+- "${s}"
++ "# DO NOT EDIT. This file is generated from Config.src"
+ fi
+ done
+