Re: difference between DECLARE_* and DEFINE_* macro namespaces ?

On Wed, 2022-09-21 at 13:33 -0600, jim.cromie@gmail.com wrote:

difference between DECLARE_* and DEFINE_* macro namespaces ?

I am not sure there is a clear difference any more nowadays. Both DECLARE_* and DEFINE_* seem to be used for both defining a type and declaring an (often initialized) instance of that type. For example, DEFINE_SPINLOCK creates an unlocked spinlock: #define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) Meanwhile, DECLARE_RWSEM does the exact same thing, but for the rw_semaphore: #define DECLARE_RWSEM(name) \ struct rw_semaphore name = __RWSEM_INITIALIZER(name) -- All Rights Reversed.