RE: [GIT] Networking

David Laight
2015-09-07T11:04:11Z

From: Rustad, Mark D
...
> >> static int smp_ah(struct crypto_blkcipher *tfm, const u8 irk[16],
> >> const u8 r[3], u8 res[3])
> >
> > Expect that it looks like you are passing arrays by value,
> > but instead you are passing by reference.
> >
> > Explicitly pass by reference and sizeof works.
>
> It depends on what you mean by works. It at least doesn't look so misleading when passing by reference
> and so works more as expected. The sizeof in either case will never return the size of the array. To
> have sizeof return the size of the array would require a typedef of the array to pass by reference. In
> some cases that could be the right thing to do.

Feed:
int bar(int (*f)[10]) { return sizeof *f; }
into cc -O2 -S and look at the generated code - returns 40 not 4.

David