75d75b7a4d
In the kernel, the "volatile" keyword is used in various concurrent
contexts, whether in low-level synchronization primitives or for
legacy reasons. If supported by the compiler, it will be assumed
that aligned volatile accesses up to sizeof(long long) (matching
compiletime_assert_rwonce_type()) are atomic.
Recent versions of Clang [1] (GCC tentative [2]) can instrument
volatile accesses differently. Add the option (required) to enable the
instrumentation, and provide the necessary runtime functions. None of
the updated compilers are widely available yet (Clang 11 will be the
first release to support the feature).
[1]
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| .. | ||
| Makefile | ||
| atomic.h | ||
| core.c | ||
| debugfs.c | ||
| encoding.h | ||
| kcsan.h | ||
| report.c | ||
| test.c | ||