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Subject[PATCH v3] TMPFS: Expand help to explain value of TMPFS_POSIX_ACL

Expand the fs/Kconfig "help" info to clarify why you might need to
select the TMPFS_POSIX_ACL config variable.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>

---
diff --git a/fs/Kconfig b/fs/Kconfig
index 19891aa..bd56bf6 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -127,14 +127,21 @@ 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, it's possible that you'll also need
+ this option as there are a number of Linux distros that require
+ POSIX ACL support under /dev for certain features to work properly.
+ For example, some distros need this feature for ALSA-related /dev
+ files for sound to work properly. In short, if you're not sure,
+ 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
--

========================================================================
Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
LinkedIn: http://ca.linkedin.com/in/rpjday
========================================================================

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