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-rw-r--r--Documentation/dev-tools/ubsan.rst28
1 files changed, 8 insertions, 20 deletions
diff --git a/Documentation/dev-tools/ubsan.rst b/Documentation/dev-tools/ubsan.rst
index 2de7c63415..e3591f8e9d 100644
--- a/Documentation/dev-tools/ubsan.rst
+++ b/Documentation/dev-tools/ubsan.rst
@@ -49,34 +49,22 @@ Report example
Usage
-----
-To enable UBSAN configure kernel with::
+To enable UBSAN, configure the kernel with::
- CONFIG_UBSAN=y
+ CONFIG_UBSAN=y
-and to check the entire kernel::
-
- CONFIG_UBSAN_SANITIZE_ALL=y
-
-To enable instrumentation for specific files or directories, add a line
-similar to the following to the respective kernel Makefile:
-
-- For a single file (e.g. main.o)::
-
- UBSAN_SANITIZE_main.o := y
-
-- For all files in one directory::
-
- UBSAN_SANITIZE := y
-
-To exclude files from being instrumented even if
-``CONFIG_UBSAN_SANITIZE_ALL=y``, use::
+To exclude files from being instrumented use::
UBSAN_SANITIZE_main.o := n
-and::
+and to exclude all targets in one directory use::
UBSAN_SANITIZE := n
+When disabled for all targets, specific files can be enabled using::
+
+ UBSAN_SANITIZE_main.o := y
+
Detection of unaligned accesses controlled through the separate option -
CONFIG_UBSAN_ALIGNMENT. It's off by default on architectures that support
unaligned accesses (CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y). One could