Re: [PATCH 23/33] generic dynamic per cpu refcounting

[Theodore Ts'o]

Reviewed-by: "Theodore Ts'o" <tytso@xxxxxxx>

> +		v = atomic64_add_return(1 + (1ULL << PCPU_COUNT_BITS),
> +					&ref->count);
> +
> +		if (!(v >> PCPU_COUNT_BITS) &&
> +		    REF_STATUS(pcpu_count) == PCPU_REF_NONE && alloc)
> +			percpu_ref_alloc(ref, pcpu_count);

This assumes that the kernel is compiled with -fno-strict-overflow.
Which we do, and this is not the only place int the kernel where we
depend on this, so while I was nervous before, I'm okay with it now.
Could we at least have a comment saying that we're depending on
-fno-strict-overflow, though?


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