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The dma_contiguous_early_fixup() function is a global __weak stub with an arm specific override, but the declaration is in an #ifdef. If CONFIG_DMA_CMA is disabled, there is no caller and no prototype, which adds a warning for the definition: arm/mm/dma-mapping.c:261:13: error: no previous prototype for 'dma_contiguous_early_fixup' [-Werror=missing-prototypes] Enclose the definition in the same #ifdef as the prototype to avoid that and save a few bytes of .init.text. Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>