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The arch_jump_label_transform_static() function in csky was originally meant to override the generic __weak function, but that got changed to an #ifndef check. This showed up as a missing-prototype warning: arch/csky/kernel/jump_label.c:43:6: error: no previous prototype for 'arch_jump_label_transform_static' [-Werror=missing-prototypes] Change the method to use the new method of having a #define and a prototype for the global function. Fixes:7e6b9db27d("jump_label: make initial NOP patching the special case") Fixes:4e8bb4ba5a("csky: Add jump-label implementation") Reviewed-by: Guo Ren <guoren@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>