[RESEND 2/2] coccinelle.txt: update documentation to include M= option

[Gregory . Dietsche]

From: Greg Dietsche <Gregory.Dietsche@xxxxxxx>

Adding documentation for the new M= option which limits Coccinelle
to a specific set of directories.

Signed-off-by: Greg Dietsche <Gregory.Dietsche@xxxxxxx>
---
 Documentation/coccinelle.txt |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/coccinelle.txt b/Documentation/coccinelle.txt
index 96b6903..cf44eb6 100644
--- a/Documentation/coccinelle.txt
+++ b/Documentation/coccinelle.txt
@@ -102,9 +102,15 @@ or
 	make coccicheck COCCI=<my_SP.cocci> MODE=report
 
 
- Using Coccinelle on (modified) files
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ Controlling Which Files are Processed by Coccinelle
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+By default the entire kernel source tree is checked.
+
+To apply Coccinelle to a specific directory, M= can be used.
+For example, to check drivers/net/wireless/ one may write:
 
+    make coccicheck M=drivers/net/wireless/
+    
 To apply Coccinelle on a file basis, instead of a directory basis, the
 following command may be used:
 
-- 
1.7.6.4

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