The shortname for a subsystem, that is primarly used when sending patches over 
E-mail, is not stored anywhere in the source code. Actually one need to dig git 
log or mailing list archives. There is no standard, and the Maintainer choose 
how to short name his/her subsystem. MAINTAINERS file is the right place for 
storing this information.

U is the second letter of Subsystem.

This will also enable automatic tools like scripts/get_maintainer.pl to provide 
the correct short name for each filename in the Kernel source tree.

Signed-off-by: Peter Senna Tschudin <peter.se...@gmail.com>
---
 MAINTAINERS | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 3386238..a1be2a1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -104,6 +104,11 @@ Descriptions of section entries:
              matches patches or files that contain one or more of the words
              printk, pr_info or pr_err
           One regex pattern per line.  Multiple K: lines acceptable.
+       U: Subsystem short name. Used in the subject of patch sent by email to
+          identify that subsystem. Short means up to 20 chars. Examples:
+          U:   media
+          U:   media/em28xx
+          U:   SCSI
 
 Note: For the hard of thinking, this list is meant to remain in alphabetical
 order. If you could add yourselves to it in alphabetical order that would be
-- 
1.7.11.4

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