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9dc052234d
Enabling KCSAN is causing a large number of duplicate types in BTF for
core kernel structs like task_struct [1]. This is due to the definition
in include/linux/compiler_types.h
`#ifdef __SANITIZE_THREAD__
...
`#define __data_racy volatile
..
`#else
...
`#define __data_racy
...
`#endif
Because some objects in the kernel are compiled without KCSAN flags
(KCSAN_SANITIZE) we sometimes get the empty __data_racy annotation for
objects; as a result we get multiple conflicting representations of the
associated structs in DWARF, and these lead to multiple instances of core
kernel types in BTF since they cannot be deduplicated due to the
additional modifier in some instances.
Moving the __data_racy definition under CONFIG_KCSAN avoids this problem,
since the volatile modifier will be present for both KCSAN and
KCSAN_SANITIZE objects in a CONFIG_KCSAN=y kernel.
Link: https://lkml.kernel.org/r/20260116091730.324322-1-alan.maguire@oracle.com
Fixes:
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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