MIPS: Watch: Avoid duplication of bits in mips_install_watch_registers.

void mips_install_watch_registers(struct task_struct *t)

{

	struct mips3264_watch_reg_state *watches = &t->thread.watch.mips3264;

	unsigned int watchhi = MIPS_WATCHHI_G |		/* Trap all ASIDs */

			       MIPS_WATCHHI_IRW;	/* Clear result bits */

	switch (current_cpu_data.watch_reg_use_cnt) {

	default:

		BUG();

	case 4:

		write_c0_watchlo3(watches->watchlo[3]);

		/* Write 1 to the I, R, and W bits to clear them, and

		   1 to G so all ASIDs are trapped. */

		write_c0_watchhi3(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |

				  watches->watchhi[3]);

		write_c0_watchhi3(watchhi | watches->watchhi[3]);

	case 3:

		write_c0_watchlo2(watches->watchlo[2]);

		write_c0_watchhi2(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |

				  watches->watchhi[2]);

		write_c0_watchhi2(watchhi | watches->watchhi[2]);

	case 2:

		write_c0_watchlo1(watches->watchlo[1]);

		write_c0_watchhi1(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |

				  watches->watchhi[1]);

		write_c0_watchhi1(watchhi | watches->watchhi[1]);

	case 1:

		write_c0_watchlo0(watches->watchlo[0]);

		write_c0_watchhi0(MIPS_WATCHHI_G | MIPS_WATCHHI_IRW |

				  watches->watchhi[0]);

		write_c0_watchhi0(watchhi | watches->watchhi[0]);

	}

}