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

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