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Problem: Linux kernel hangs in early boot on 32-bit ARM platform, when ftrace 4-byte "mcount" function call location for "_raw_spin_unlock_irqrestore" function straddles icache lines. Discussion on the forum: https://forum.armbian.com/topic/41339-linux-image-legacy-sunxi2451-kernel-6192-is-broken-stuck-at-starting-kernel/?do=findComment&comment=196528