From: Helge Deller <deller@xxxxxx>
Report if the calculated cache stride size is zero, otherwise the cache
flushing routine will never finish and hang the machine.
This can be reproduced with a testcase in qemu, where the firmware reports
wrong cache values.
Signed-off-by: Helge Deller <deller@xxxxxx>
---
arch/parisc/kernel/cache.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 268d90a9325b..0c015487e5db 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -264,6 +264,10 @@ parisc_cache_init(void)
icache_stride = CAFL_STRIDE(cache_info.ic_conf);
#undef CAFL_STRIDE
+ /* stride needs to be non-zero, otherwise cache flushes will not work */
+ WARN_ON(cache_info.dc_size && dcache_stride == 0);
+ WARN_ON(cache_info.ic_size && icache_stride == 0);
+
if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
PDC_MODEL_NVA_UNSUPPORTED) {
printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
--
2.43.0
