linux-kernel - Re: [PATCH 2/9] add support for the TI VLYNQ bus

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 4 Jun 2009 04:20:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Florian Fainelli <florian@...nwrt.org>
Cc:	linux-kernel@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 2/9] add support for the TI VLYNQ bus

On Thu, 4 Jun 2009 12:52:18 +0200 Florian Fainelli <florian@...nwrt.org> wrote:

> Le Tuesday 02 June 2009 07:08:54 Andrew Morton, vous avez __crit__:
> > On Mon, 1 Jun 2009 13:58:27 +0200 Florian Fainelli <florian@...nwrt.org> 
> wrote:
> > > This patch adds support for the TI VLYNQ high-speed,
> > > serial and packetized bus. This bus allows external
> > > devices to be connected to the System-on-Chip and
> > > appear in the main system memory just like any memory
> > > mapped peripheral. It is widely used in TI's networking
> > > and mutlimedia SoC, including the AR7 SoC.
> > >
> > >
> > > ...
> > >
> > > +struct vlynq_regs {
> > > +	u32 revision;
> > > +	u32 control;
> > > +	u32 status;
> > > +	u32 int_prio;
> > > +	u32 int_status;
> > > +	u32 int_pending;
> > > +	u32 int_ptr;
> > > +	u32 tx_offset;
> > > +	struct vlynq_mapping rx_mapping[4];
> > > +	u32 chip;
> > > +	u32 autonego;
> > > +	u32 unused[6];
> > > +	u32 int_device[8];
> > > +};
> > > +
> > > +#define vlynq_reg_read(reg) readl(&(reg))
> > > +#define vlynq_reg_write(reg, val)  writel(val, &(reg))
> >
> > grumble.  These just make the code harder to follow.  it'd be better to
> > open-code readl() and writel() at the callsites.
> 
> I do not understand how to fix this. Would an inlined accessors be a better 
> solution for you?

Just remove the accessors altogether.  Each place where there is a call
to vlynq_reg_read(), replace that with a call to readl().

Unless there's a reason not to do this.  For example, some hardware
might require a udelay(1) before each writel(), or some platforms might
want to use outl()/inl().  In cases like these, sure, standalone
functions are needed to handle them.

But if vlynq_reg_read() and vlynq_reg_write() will never do anything
apart from a bare readl()/writel() then let's just remove them
altogether, as they add nothing.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/