linux-kernel - Re: [PATCH V8 08/13] posix clocks: cleanup the CLOCK

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, 13 Jan 2011 05:30:45 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Lameter <cl@...ux.com>,
	David Miller <davem@...emloft.net>,
	John Stultz <johnstul@...ibm.com>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>
Subject: Re: [PATCH V8 08/13] posix clocks: cleanup the CLOCK_DISPTACH macro

On Tue, Jan 11, 2011 at 01:57:23PM +0100, Thomas Gleixner wrote:
> 
> static clockid_t clock_get_array_id(const clockid_t id)
> {
> 	if (id >= 0)
> 	       return id < MAX_CLOCKS ? id : POSIX_INV_CLOCK_ID;
> 
>       	if (clock_is_posix_cpu(id))
> 		return POSIX_CPU_CLOCK_ID;
> 
> 	return POSIX_INV_CLOCK_ID;
> }
> 
> static inline int dispatch_clock_getres(const clockid_t id, struct timespec *ts)
> {
> 	struct k_clock *clk = &posix_clocks[clock_get_array_id(id)];
> 
> 	return clk->clock_getres ? clk->clock_getres(id, ts) : -EINVAL;
> }

I would like to take this idea one step further, like so:

static struct k_clock *clockid_to_kclock(const clockid_t id)
{
	if (id >= 0)
		return id < MAX_CLOCKS ?
			&posix_clocks[id] : &posix_clocks[POSIX_INV_CLOCK_ID];
	...
}

SYSCALL( ... , const clockid_t id, struct timespec *ts)
{
	struct k_clock *clk = clockid_to_kclock(id);

	return clk->clock_getres ? clk->clock_getres(id, ts) : -EINVAL;
}

What do you think?

Thanks,

Richard
--
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/