MIPS: mm: c-r4k: Flush scache to avoid cache aliases

[mirror_ubuntu-bionic-kernel.git] / arch / mips / mm / c-r4k.c

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 9b223e07f7847b5c9e51444fbac2c60f92450a52..8fc713f1d13989853d41c471fb3127f80473f992 100644 (file)
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -640,6 +640,17 @@ static inline void local_r4k_flush_icache_range(unsigned long start, unsigned lo
                        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_ipi(void *args)