On Tue, Feb 7, 2023 at 7:22 PM Rohan McLure <rmcl...@linux.ibm.com> wrote:
>
> KCSAN instruments calls to atomic builtins, and will in turn call these
> builtins itself. As such, architectures supporting KCSAN must have
> compiler support for these atomic primitives.
>
> Since 32-bit systems are unlikely to have 64-bit compiler builtins,
> provide a stub for each missing builtin, and use BUG() to assert
> unreachability.
>
> In commit 725aea873261 ("xtensa: enable KCSAN"), xtensa implements these
> locally, but does not advertise the fact with preprocessor macros. To
> avoid production of duplicate symbols, do not build the stubs on xtensa.
> A future patch will remove the xtensa implementation of these stubs.
>
> Signed-off-by: Rohan McLure <rmcl...@linux.ibm.com>
> ---
> v4: New patch
> ---
> kernel/kcsan/Makefile | 3 ++
> kernel/kcsan/stubs.c | 78 +++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 81 insertions(+)
> create mode 100644 kernel/kcsan/stubs.c
Reviewed-by: Max Filippov <jcmvb...@gmail.com>
--
Thanks.
-- Max
