linux-kernel - Re: [PATCH 2/7] Initial implementation of the trec driver and include files

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Date:	Wed, 21 Mar 2007 19:17:40 +0100
From:	Johannes Weiner <hannes-kernel@...urebad.de>
To:	Wink Saville <wink@...ille.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] Initial implementation of the trec driver and include files

Hi,

On Wed, Mar 21, 2007 at 09:49:12AM -0700, Wink Saville wrote:
> >>Please don't use camel-case - in general.
> >>    
> Would p_next, p_cur and p_end be OK?

I think it's generally disliked. Quoting Documentation/CodingStyle:

``Encoding the type of a function into the name (so-called Hungarian
notation) is brain damaged - the compiler knows the types anyway and can
check those, and it only confuses the programmer.  No wonder MicroSoft
makes buggy programs.''

> >>--- /dev/null
> >>+++ b/include/linux/trec.h
> >>@@ -0,0 +1,34 @@
> >>+/*
> >>+#define TREC0()			trec_write(TREC_PC_ADDR, TREC_PID, 
> >>0, 0)
> >>    
> [...]
> >>+
> >>+#define ZREC0()			do { } while (0)
> >>    
> >Why not seperate them by an #ifndef? So you don't have to replace TREC?
> >with ZREC? but rather change one #define knob.
> 
> The reason is to allow the user easily change individual TREC's from 
> active to inactive by just
> changing a single character. Eventually I envision adding runtime 
> support for changing if a
> particular set of TREC's are active or not, but this was simple.

You can implement a sysctl-setting to enable/disable the whole system
(which then would be runtime changeable).

=Hannes
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