Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH][next] afs: fix integer overflow when shifting 1 more than 32 places | Date | Wed, 11 Apr 2018 15:10:16 +0100 |
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Colin Ian King <colin.king@canonical.com> wrote:
> >> - mask = (1 << nr_slots) - 1; > >> + mask = (1ULL << nr_slots) - 1; > > > > nr_slots cannot be larger than 9, so what I wrote is actually fine and is > > more efficient on a 32-bit machine. > > ok, sorry about the noise.
It would be possible to cast the value to u64 before assigning it, I suppose. Would that help? E.g.:
mask = (u64)((1 << nr_slots) - 1);
It looks a bit odd, though, since the cast is made implicitly anyway.
David
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