Expand the fs/Kconfig "help" info to clarify why it's a bad idea to

deselect the TMPFS_POSIX_ACL config variable.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/Kconfig b/fs/Kconfig
index 19891aab9c6ed7255388f175eabfcd7e4f5bb253..98a5419f92e33142377f3ac607341320601d0a46 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -127,14 +127,20 @@ config TMPFS_POSIX_ACL
        select TMPFS_XATTR
        select GENERIC_ACL
        help
-         POSIX Access Control Lists (ACLs) support permissions for users and
-         groups beyond the owner/group/world scheme.
+         POSIX Access Control Lists (ACLs) support additional access rights
+         for users and groups beyond the standard owner/group/world scheme,
+         and this option selects support for ACLs specifically for tmpfs
+         filesystems.
+
+         If you've selected TMPFS, you almost certainly want this option
+         as well since a number of user space features (e.g., ALSA sound)
+         require POSIX ACL support under /dev to work properly.  In other
+         words, if you're not sure and you have no *compelling* reason to
+         deselect this feature, say Y.
 
          To learn more about Access Control Lists, visit the POSIX ACLs for
          Linux website <http://acl.bestbits.at/>.
 
-         If you don't know what Access Control Lists are, say N.
-
 config TMPFS_XATTR
        bool "Tmpfs extended attributes"
        depends on TMPFS