Help text update and tweak to defconfig to remove two more things that

the "maximum sane configuration" shouldn't have.  (Explicit MTAB support in
mount, which you should only need if you have no /proc, and FEATURE_CLEAN_UP,
which exists to humor valgrind and otherwise just bloats the code).

2 files changed, 13 insertions, 10 deletions

diff --git a/Config.in b/Config.in
index 0afc34a94..070085b94 100644
--- a/Config.in
+++ b/Config.in
@@ -80,10 +80,12 @@ config CONFIG_FEATURE_CLEAN_UP
         bool "Clean up all memory before exiting (usually not needed)"
         default n
         help
-          As a size optimization, busybox by default does not cleanup memory
-          that is dynamically allocated or close files before exiting. This
-          saves space and is usually not needed since the OS will clean up for
-          us.  Don't enable this unless you have a really good reason to clean
+          As a size optimization, busybox normally exits without explicitly
+          freeing dynamically allocated memory or closing files.  This saves
+          space since the OS will clean up for us, but it can confuse debuggers
+          like valgrind, which report tons of memory and resource leaks.
+
+          Don't enable this unless you have a really good reason to clean
           things up manually.
 
 config CONFIG_FEATURE_SUID
diff --git a/Makefile b/Makefile
index 1177f147a..b69e5040f 100644
--- a/Makefile
+++ b/Makefile
@@ -121,10 +121,10 @@ help:
         @echo
         @echo 'Configuration:'
         @echo '  allnoconfig            - disable all symbols in .config'
-        @echo '  allyesconfig           - enable (almost) all symbols in .config'
-        @echo '  allbareconfig          - enable all basics without any features'
+        @echo '  allyesconfig           - enable all symbols in .config (see defconfig)'
+        @echo '  allbareconfig          - enable all applets without any sub-features'
         @echo '  config         - text based configurator (of last resort)'
-        @echo '  defconfig              - set .config to defaults'
+        @echo '  defconfig              - set .config to largest generic configuration'
         @echo '  menuconfig             - interactive curses-based configurator'
         @echo '  oldconfig              - resolve any unresolved symbols in .config'
         @echo
@@ -191,12 +191,13 @@ allyesconfig: scripts/config/conf
 allnoconfig: scripts/config/conf
         @./scripts/config/conf -n $(CONFIG_CONFIG_IN)
 
-#defconfig: scripts/config/conf
-#       @./scripts/config/conf -d $(CONFIG_CONFIG_IN)
+# defconfig is allyesconfig minus any features that are specialized enough
+# or cause enough behavior change that the user really should switch them on
+# manually if that's what they want.  Sort of "maximum sane config".
 
 defconfig: scripts/config/conf
         @./scripts/config/conf -y $(CONFIG_CONFIG_IN)
-        sed -i -r -e "s/^(USING_CROSS_COMPILER|CONFIG_(DEBUG.*|STATIC|SELINUX|FEATURE_DEVFS|BUILD_AT_ONCE|BUILD_LIBBUSYBOX|FEATURE_FULL_LIBBUSYBOX|FEATURE_SHARED_BUSYBOX))=.*/# \1 is not set/" .config
+        sed -i -r -e "s/^(USING_CROSS_COMPILER|CONFIG_(DEBUG.*|STATIC|SELINUX|BUILD_(AT_ONCE|LIBBUSYBOX)|FEATURE_(DEVFS|FULL_LIBBUSYBOX|SHARED_BUSYBOX|MTAB_SUPPORT|CLEAN_UP)))=.*/# \1 is not set/" .config
         @./scripts/config/conf -o $(CONFIG_CONFIG_IN)