How to compile kernel with GCC LTO in ARM?
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I am a beginner. I am very interested in the LTO kernel at present and want to use LTO to compile the kernel on ARM.
In kernel-lto.pdf, I see "tested on X86, arm, MIPs" and "branch lto-3. X", but I see "only tested on X86 for now." in branch lto-3. X. It seems that ARM is not supported. I also tried branch lto-4. X and branch lto-5. X, but failed.
In Microsoft-Exploring-PGO-Linux, I see that Microsoft seems to have succeeded, but I haven't found the relevant kernel code or relevant documents.
How can I compile the kernel successfully with LTO in ARM? thank you!
@andikleen @arndb Could you give me some advice for LTO on ARM？Thank you.
See Sami's recent work at https://lore.kernel.org/lkml/20201118220731.925424-1-samitolvanen@google.com/