[PATCH] docs: update sparse.txt with CHECK_ENDIAN
Update the sparse documentation to omit the -Wbitwise flag example (as it
is now passed by default), and document the kernel defines to enable
endianness checking.
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Documentation/sparse.txt b/Documentation/sparse.txt
index 3f1c546..5a311c3 100644
--- a/Documentation/sparse.txt
+++ b/Documentation/sparse.txt
@@ -1,5 +1,6 @@
Copyright 2004 Linus Torvalds
Copyright 2004 Pavel Machek <pavel@suse.cz>
+Copyright 2006 Bob Copeland <me@bobcopeland.com>
Using sparse for typechecking
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -41,15 +42,8 @@
vs cpu-endian vs whatever), and there the constant "0" really _is_
special.
-Use
-
- make C=[12] CF=-Wbitwise
-
-or you don't get any checking at all.
-
-
-Where to get sparse
-~~~~~~~~~~~~~~~~~~~
+Getting sparse
+~~~~~~~~~~~~~~
With git, you can just get it from
@@ -57,7 +51,7 @@
and DaveJ has tar-balls at
- http://www.codemonkey.org.uk/projects/git-snapshots/sparse/
+ http://www.codemonkey.org.uk/projects/git-snapshots/sparse/
Once you have it, just do
@@ -65,8 +59,20 @@
make
make install
-as your regular user, and it will install sparse in your ~/bin directory.
-After that, doing a kernel make with "make C=1" will run sparse on all the
-C files that get recompiled, or with "make C=2" will run sparse on the
-files whether they need to be recompiled or not (ie the latter is fast way
-to check the whole tree if you have already built it).
+as a regular user, and it will install sparse in your ~/bin directory.
+
+Using sparse
+~~~~~~~~~~~~
+
+Do a kernel make with "make C=1" to run sparse on all the C files that get
+recompiled, or use "make C=2" to run sparse on the files whether they need to
+be recompiled or not. The latter is a fast way to check the whole tree if you
+have already built it.
+
+The optional make variable CF can be used to pass arguments to sparse. The
+build system passes -Wbitwise to sparse automatically. To perform endianness
+checks, you may define __CHECK_ENDIAN__:
+
+ make C=2 CF="-D__CHECK_ENDIAN__"
+
+These checks are disabled by default as they generate a host of warnings.
