From: Bob Copeland Date: Fri, 23 Jun 2006 09:06:09 +0000 (-0700) Subject: [PATCH] docs: update sparse.txt with CHECK_ENDIAN X-Git-Tag: v2.6.18-rc1~1081^2~20 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e83319510b04dd51a60da8a0b4ccf8b92b3ab1ad;p=linux-2.6 [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/Documentation/sparse.txt b/Documentation/sparse.txt index 3f1c5464b1..5a311c38dd 100644 --- a/Documentation/sparse.txt +++ b/Documentation/sparse.txt @@ -1,5 +1,6 @@ Copyright 2004 Linus Torvalds Copyright 2004 Pavel Machek +Copyright 2006 Bob Copeland 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.