[PATCH 6.18 146/277] MIPS: SiByte: Bring back cache initialisation

Greg Kroah-Hartman
2026-04-08T18:34:21Z

From: Maciej W. Rozycki <macro@orcam.me.uk>

commit d62cf1511743526f530a4c169424e50c757f5a5e upstream.

Bring back cache initialisation for Broadcom SiByte SB1 cores, which has
been removed causing the kernel to hang at bootstrap right after:

Dentry cache hash table entries: 524288 (order: 8, 4194304 bytes, linear)
Inode-cache hash table entries: 262144 (order: 7, 2097152 bytes, linear)

The cause of the problem is R4k cache handlers are also used by Broadcom
SiByte SB1 cores, however with a different cache error exception handler
and therefore not using CPU_R4K_CACHE_TLB:

obj-$(CONFIG_CPU_R4K_CACHE_TLB) += c-r4k.o cex-gen.o tlb-r4k.o
obj-$(CONFIG_CPU_SB1) += c-r4k.o cerr-sb1.o cex-sb1.o tlb-r4k.o

(from arch/mips/mm/Makefile).

Fixes: bbe4f634f48c ("mips: fix r3k_cache_init build regression")
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Cc: stable@vger.kernel.org # v6.8+
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/mips/mm/cache.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -207,7 +207,8 @@ void cpu_cache_init(void)
{
if (IS_ENABLED(CONFIG_CPU_R3000) && cpu_has_3k_cache)
r3k_cache_init();
- if (IS_ENABLED(CONFIG_CPU_R4K_CACHE_TLB) && cpu_has_4k_cache)
+ if ((IS_ENABLED(CONFIG_CPU_R4K_CACHE_TLB) ||
+ IS_ENABLED(CONFIG_CPU_SB1)) && cpu_has_4k_cache)
r4k_cache_init();

if (IS_ENABLED(CONFIG_CPU_CAVIUM_OCTEON) && cpu_has_octeon_cache)