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[PATCH] docs: update sparse.txt with CHECK_ENDIAN

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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>
This commit is contained in:
Bob Copeland 2006-06-23 02:06:09 -07:00 committed by Linus Torvalds
parent eefe85ee35
commit e83319510b
1 changed files with 21 additions and 15 deletions
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36
Documentation/sparse.txt
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@ -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 @@ sure that bitwise types don't get mixed up (little-endian vs big-endian
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 @@ With git, you can just get it from
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 @@ Once you have it, just do
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.