locking/atomic: add arch_atomic_long*()

Now that all architectures provide arch_{atomic,atomic64}_*(), we can
build arch_atomic_long_*() atop these, which can be safely used in
noinstr code. The regular atomic_long_*() wrappers are built atop these,
as we do for {atomic,atomic64}_*() atop arch_{atomic,atomic64}_*().

We don't provide arch_* versions of the cond_read*() variants, as we
don't have arch_* versions of the underlying atomic/atomic64 functions
(nor the smp_cond_load*() helpers these are typically based on).

Note that the headers in this patch under include/linux/atomic/ are
generated by the scripts in scripts/atomic/.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210713105253.7615-5-mark.rutland@arm.com

include/linux/atomic.h

@@ -78,7 +78,7 @@
 })
 
 #include <linux/atomic/atomic-arch-fallback.h>
-#include <linux/atomic/atomic-instrumented.h>
 #include <linux/atomic/atomic-long.h>
+#include <linux/atomic/atomic-instrumented.h>
 
 #endif /* _LINUX_ATOMIC_H */