[opensuse] sysctl -w kernel.shmmax=100000000

I was trying Avast on SuSE 12.1.
But I always got an error message
"avast: can not initialize avast! engine: Invalid argument"
when scanning files.

In the web I found the following site with a solution:
http://manoftherambla.wordpress.com/2011/05/02/avast-can-not-initialize-avast-engine-invalid-argument/

which states that I have to do
sysctl -w kernel.shmmax=100000000
as root, which did the trick.

Now the question: is this something that I can tune in SuSE 12.1?
Some setting to make it permanent (beside compiling a new kernel)?

Any disadvantages?

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