linux-kernel - RE: [PATCH v3] net: bluetooth: hci_sock: Use 'const u32 *' instead of 'void *' for 2nd parameter of hci_test

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Date:	Mon, 9 Feb 2015 10:44:44 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Chen Gang S' <gang.chen@...rus.com.cn>,
	Marcel Holtmann <marcel@...tmann.org>
CC:	Joe Perches <joe@...ches.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v3] net: bluetooth: hci_sock: Use 'const u32 *' instead
 of 'void *' for 2nd parameter of hci_test_bit()

From: Chen Gang
...
> So at present, in kernel part, we can only say the original authors
> intended to do like this. And only within kernel part, it can not cause
> issue. I guess, original authors originally knew what we talk about.

I've just searched for hci_u*filter it is all horrid.
Look at the code for get/set_sockopt of HCI_FILTER.
Someone seems to have done a complete 'bodge job' of fixing the user interface
for apps (32bit and 64bit) on 64bit kernels.

> This patch is for fixing building warnings without any negative effect.
> And most of us are not the suitable members to continue analyzing. So
> at present, for me, we can accept this patch.

And, not uncommonly, it has shown up a 'bag of worms'.

If you change 'hci_filter' to contain u32[2] then you can drop
all of the casts and the temporary structures in the sockopt code.
Just be aware of the tail-padding.

	David

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