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kcsan: Update Documentation to change supported compilers

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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
This commit is contained in:
Marco Elver 2020-05-21 16:20:43 +02:00 committed by Thomas Gleixner
parent e3b779d9eb
commit 0bb9ab3a6f
1 changed files with 1 additions and 8 deletions
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Documentation/dev-tools/kcsan.rst
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@ -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``::