linux-kernel - Re: [RFC PATCH v2 1/3] getcpu_cache system call: cache CPU number of running thread

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Message-ID: <alpine.DEB.2.11.1601271836510.3886@nanos>
Date:	Wed, 27 Jan 2016 18:37:42 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
cc:	Paul Turner <pjt@...gle.com>, Andrew Hunter <ahh@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	linux-api <linux-api@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Watson <davejwatson@...com>, Chris Lameter <cl@...ux.com>,
	Ingo Molnar <mingo@...hat.com>, Ben Maurer <bmaurer@...com>,
	rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [RFC PATCH v2 1/3] getcpu_cache system call: cache CPU number
 of running thread

On Wed, 27 Jan 2016, Thomas Gleixner wrote:

> On Wed, 27 Jan 2016, Mathieu Desnoyers wrote:
> > ----- On Jan 27, 2016, at 12:22 PM, Thomas Gleixner tglx@...utronix.de wrote:
> > Sounds fair. What is the recommended typing for "ptr" then ?
> > uint32_t ** or uint32_t * ?
> > 
> > It would be expected to pass a "uint32_t *" for the set
> > operation, but the "get" operation requires a "uint32_t **".
> 
> Well, you can't change the types depending on the opcode, so you need to stick
> with **.

Alternatively you make it:

 (opcode, *newptr, **oldptr, flags);