In QEMU we emulate a machine without any data or instruction caches.
Avoid calling the assembly cache flush functions when we have no caches
improves speed with qemu a lot.
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index d5381b3e8f95..b4b6f6631d3b 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -55,11 +55,17 @@ static struct pdc_btlb_info btlb_info __read_mostly;
void
flush_data_cache(void)
{
+ if (unlikely(!cache_info.dc_size))
+ return;
+
on_each_cpu(flush_data_cache_local, NULL, 1);
}
void
flush_instruction_cache(void)
{
+ if (unlikely(!cache_info.ic_size))
+ return;
+
on_each_cpu(flush_instruction_cache_local, NULL, 1);
}
#endif
@@ -67,8 +73,10 @@ flush_instruction_cache(void)
void
flush_cache_all_local(void)
{
- flush_instruction_cache_local(NULL);
- flush_data_cache_local(NULL);
+ if (likely(cache_info.ic_size))
+ flush_instruction_cache_local(NULL);
+ if (likely(cache_info.dc_size))
+ flush_data_cache_local(NULL);
}
EXPORT_SYMBOL(flush_cache_all_local);
@@ -506,7 +515,8 @@ static void cacheflush_h_tmp_function(void *dummy)
void flush_cache_all(void)
{
- on_each_cpu(cacheflush_h_tmp_function, NULL, 1);
+ if (likely(cache_info.dc_size || cache_info.ic_size))
+ on_each_cpu(cacheflush_h_tmp_function, NULL, 1);
}
static inline unsigned long mm_total_size(struct mm_struct *mm)
--
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