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Compiling a C file which includes genalloc.h but without spinlock_types.h being included before, we will see the compile error below. include/linux/genalloc.h:54:2: error: unknown type name `spinlock_t' Include spinlock_types.h from genalloc.h to fix the problem. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>