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Hook up the generic vDSO implementation to the generic vDSO getrandom implementation by providing the required __arch_chacha20_blocks_nostack and getrandom_syscall implementations. Also wire up the selftests. The benchmark result: vdso: 25000000 times in 2.466341333 seconds libc: 25000000 times in 41.447720005 seconds syscall: 25000000 times in 41.043926672 seconds vdso: 25000000 x 256 times in 162.286219353 seconds libc: 25000000 x 256 times in 2953.855018685 seconds syscall: 25000000 x 256 times in 2796.268546000 seconds Signed-off-by: Xi Ruoyao <xry111@xry111.site> Link: https://lore.kernel.org/r/20250411024600.16045-1-xry111@xry111.site Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>