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The function is unconditionally defined in smp.c but is conditionally declared in a header that is not included here. arch/mips/kernel/smp.c:473:5: error: no previous prototype for 'setup_profiling_timer' [-Werror=missing-prototypes] Add the missing #include and #ifdef to match the declaration. Link: https://lkml.kernel.org/r/20231204115710.2247097-20-arnd@kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Stephen Rothwell <sfr@rothwell.id.au> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>