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There's a selftest that checks FPRs aren't corrupted by preemption, or just process scheduling. However it only checks the non-volatile FPRs, meaning corruption of the volatile FPRs could go undetected. The check_fpu function it calls is used by several other tests, so for now add a new routine to check all the FPRs. Increase the size of the array of FPRs to 32, and initialise them all with random values. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20231128132748.1990179-2-mpe@ellerman.id.au