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authorMarco Elver <elver@google.com>2020-05-21 17:20:43 +0300
committerThomas Gleixner <tglx@linutronix.de>2020-06-11 21:04:02 +0300
commit0bb9ab3a6fa7ca9f627d85f6f683fae51598e8c8 (patch)
tree6ae2f6ea2f85aec437627ab65ab13a3822bebe81 /Documentation
parente3b779d9ebe82b4be0121f25f27632844bb86d96 (diff)
downloadlinux-0bb9ab3a6fa7ca9f627d85f6f683fae51598e8c8.tar.xz
kcsan: Update Documentation to change supported compilers
Document change in required compiler version for KCSAN, and remove the now redundant note about __no_kcsan and inlining problems with older compilers. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will@kernel.org> Link: https://lkml.kernel.org/r/20200521142047.169334-8-elver@google.com
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/dev-tools/kcsan.rst9
1 files changed, 1 insertions, 8 deletions
diff --git a/Documentation/dev-tools/kcsan.rst b/Documentation/dev-tools/kcsan.rst
index f4b5766f12cc..ce4bbd918648 100644
--- a/Documentation/dev-tools/kcsan.rst
+++ b/Documentation/dev-tools/kcsan.rst
@@ -8,8 +8,7 @@ approach to detect races. KCSAN's primary purpose is to detect `data races`_.
Usage
-----
-KCSAN is supported in both GCC and Clang. With GCC it requires version 7.3.0 or
-later. With Clang it requires version 7.0.0 or later.
+KCSAN requires Clang version 11 or later.
To enable KCSAN configure the kernel with::
@@ -121,12 +120,6 @@ the below options are available:
static __no_kcsan_or_inline void foo(void) {
...
- Note: Older compiler versions (GCC < 9) also do not always honor the
- ``__no_kcsan`` attribute on regular ``inline`` functions. If false positives
- with these compilers cannot be tolerated, for small functions where
- ``__always_inline`` would be appropriate, ``__no_kcsan_or_inline`` should be
- preferred instead.
-
* To disable data race detection for a particular compilation unit, add to the
``Makefile``::