Commit d260d97e authored Sep 01, 2016 by James Hogan Committed by Ralf Baechle Oct 04, 2016

MIPS: c-r4k: Drop bc_wback_inv() from icache flush



The EVA conditional bc_wback_inv() at the end of flush_icache_range() to
flush the modified code all the way back to RAM was apparently there for
debug purposes and to accommodate the Malta EVA configuration which
makes use of a physical alias, and didn't use the CP0_EBase.WG (Write
Gate) bit to put the exception vector in the same physical alias where
the exception vector code is written and is being flushed.

Now that CP0_EBase.WG is used, lets drop this flush.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14151/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 4b22c693

arch/mips/mm/c-r4k.c

+0 −11

Original line number	Diff line number	Diff line
		@@ -752,17 +752,6 @@ static inline void __local_r4k_flush_icache_range(unsigned long start,
		break;
		}
		}
		#ifdef CONFIG_EVA
		/*
		* Due to all possible segment mappings, there might cache aliases
		* caused by the bootloader being in non-EVA mode, and the CPU switching
		* to EVA during early kernel init. It's best to flush the scache
		* to avoid having secondary cores fetching stale data and lead to
		* kernel crashes.
		*/
		bc_wback_inv(start, (end - start));
		__sync();
		#endif
		}

		static inline void local_r4k_flush_icache_range(unsigned long start,