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SubjectRe: [Xen-devel] [PATCH 2 of 5] early PV on HVM
On 03/12/2010 11:09 AM, Stefano Stabellini wrote:
> My version is not 64-bit specific, should I move it to a new file
> anyway?
>
> I was trying to keep the differences with Sheng's version low, but in
> this case I am not quite sure how to manage it.
> Suggestions are welcome.
>

My rough rules for code layout (in no particular order):

* keep similar functions together (even if they're not necessarily
sharing common code)
* dislike externs and cross-file references (ie, prefer static
functions/data) -> keep code sharing functions/data together
* dislike #ifdef CONFIG_x within files; prefer Makefile rules to
either completely compile or not compile files
* dislike dumping-ground files
* dislike too-small files
* dislike moving code between files, so its better to get it right
from the start (it makes merging harder)

So in this case, enlighten.c is the general setup/init/misc file in
xen/. I've been trying to move things out of it to reduce its dumping
ground-ness. In your case, the changes are clearly init, so they
probably belong there. They're compiled unconditionally, so there's no
#ifdef. They're fairly small so they would probably be too small in a
separate file (unless its likely to get bigger?). So keep in enlighten.c.

(In Sheng's version of this patch, it has more code and is conditionally
compiled, so I think the balance tips the other way.)

J



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