The largest value we use here is 0x02000000. Perhaps v4l2_std_id
shouldn't
be 64-bit?
Too late to change it to 32 bits. It is at V4L2 userspace API since
kernel 2.6.0. We can, however use this approach as a workaround, with
the proper documentation.
Maybe with a BUG_ON(id > UINT_MAX) ?
If the code code is like
u64 user_id;
u32 kernel_id = user_id;
(or different types, just showing the difference in word
lengths here) it's easiest and safest to do
BUG_ON(kernel_id != user_id);
i.e. cast back up to 64-bit, see if it's identical to the
original. You won't have to worry about sign extensions or
similar that way, the BUG_ON() condition expresses the actual
requirement directly.
Segher
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