linux-kernel - Re: [PATCH v3 01/17] hashtable: introduce a small and naive hashtable

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Message-ID: <50468778.5000207@redhat.com>
Date:	Tue, 04 Sep 2012 23:58:00 +0100
From:	Pedro Alves <palves@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Tejun Heo <tj@...nel.org>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, paul.gortmaker@...driver.com,
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Subject: Re: [PATCH v3 01/17] hashtable: introduce a small and naive hashtable

On 09/04/2012 11:41 PM, Steven Rostedt wrote:
> Ah, I missed the condition with the rec == &pg->records[pg->index]. But
> if ftrace_pages_start is NULL, the rec = &pg->records[pg->index] will
> fault.

Right.

> 
> You could do something like rec = pg ? &pg->records[pg->index] : NULL,

Right.

> but IIRC, the comma operator does not guarantee order evaluation. That
> is, the compiler is allowed to process "a , b" as "b; a;" and not "a;
> b;".

Not true.  The comma operator introduces a sequence point.  It's the comma
that separates function parameters that doesn't guarantee ordering.

-- 
Pedro Alves

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