Hello, I developed a SHA224/256 kernel crypto module with SPE instructions. The result looks quite promising (~ +50% speedup). Nevertheless the flooding of kernel messages "SPE used in kernel" makes me feel uncomfortable.
My findings so far: - I can configure the kernel with "SPE support". - arch/powerpc/kernel/head_fsl_booke.S suggests that the message is triggerd unconditionally whenwever we make use of SPE in kernel. - There exists a function enable_kernel_spe() but I don't know how this could help me in my work. I guess I need some kind of "brackets" around my coding to make sure the upper 32 bit of the registers are stored correctly during task switch. Or is the use of SPE instructions inside the kernel totally forbidden? Any expert with some helpful advise? Thanks in advance. Markus
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