graphic: 0.585 device: 0.440 performance: 0.437 other: 0.364 network: 0.355 semantic: 0.323 vnc: 0.305 socket: 0.246 PID: 0.140 KVM: 0.139 debug: 0.124 boot: 0.087 files: 0.086 permissions: 0.041 qemu/hw/char/exynos4210_uart.c: possible pointless local variable ? $ fgrep frame_size qemu/hw/char/exynos4210_uart.c int speed, parity, data_bits, stop_bits, frame_size; frame_size = 1; /* start bit */ frame_size++; /* parity bit */ frame_size += data_bits + stop_bits; $ Suggest either use it or delete it. Thanks for the report -- patch sent to mailing list which deletes the variable. Now fixed in git master, commit e62694a078f182.