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Re:Moving the Linux Kernel to Modern C by brenns10 on Thursday February 24, 2022 @06:58PM (#30462059)
They do! Consider this patch which adds the GCC implementation necessary to make "static keys" work:

https://gcc.gnu.org/legacy-ml/gcc-patches/2009-07/msg01556.h...

Static keys are a kernel API that allows code modification at runtime to achieve zero cost feature flags, like tracing:

https://www.kernel.org/doc/html/latest/staging/static-keys.h...

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