netdev - RE: [GIT] Networking

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Date:	Mon, 7 Sep 2015 11:02:59 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	"'Rustad, Mark D'" <mark.d.rustad@...el.com>
CC:	Marcel Holtmann <marcel@...tmann.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
	"Berg, Johannes" <johannes.berg@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Network Development" <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [GIT] Networking

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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