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RE: [GIT] Networking

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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

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Re: [GIT] Networking Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-03 18:50 +0200
  Re: [GIT] Networking David Miller <davem@davemloft.net> - 2015-09-03 19:50 +0200
    Re: [GIT] Networking Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-03 20:30 +0200
      Re: [GIT] Networking Joe Perches <joe@perches.com> - 2015-09-03 20:40 +0200
        Re: [GIT] Networking Julia Lawall <julia.lawall@lip6.fr> - 2015-09-03 21:40 +0200
          Re: [GIT] Networking Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-03 21:50 +0200
            Re: [GIT] Networking Julia Lawall <julia.lawall@lip6.fr> - 2015-09-03 23:00 +0200
              Re: [GIT] Networking Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-03 23:10 +0200
                Re: [GIT] Networking Julia Lawall <julia.lawall@lip6.fr> - 2015-09-03 23:30 +0200
      Re: [GIT] Networking Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-03 20:40 +0200
        Re: [GIT] Networking Marcel Holtmann <marcel@holtmann.org> - 2015-09-03 23:10 +0200
          RE: [GIT] Networking David Laight <David.Laight@ACULAB.COM> - 2015-09-04 11:10 +0200
            Re: [GIT] Networking "Rustad, Mark D" <mark.d.rustad@intel.com> - 2015-09-04 19:40 +0200
              RE: [GIT] Networking David Laight <David.Laight@ACULAB.COM> - 2015-09-07 13:10 +0200
                Re: [GIT] Networking "Rustad, Mark D" <mark.d.rustad@intel.com> - 2015-09-08 19:00 +0200
      Re: [GIT] Networking David Miller <davem@davemloft.net> - 2015-09-03 20:50 +0200
  Re: [GIT] Networking Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> - 2015-09-05 18:20 +0200

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