How can I use -O3 compiler optimization flag?

Ketan Singh unix.ketan at
Mon Sep 25 00:40:38 EDT 2017

I am building a kernel for arm64 and I want to add -O3 kernel
optimization flag to check if this can give any performance
improvement. Someone already made a path to do this and reported little
improvement in some applications but that patch is only for x86.

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