Revert "parisc: Increase parisc_cache_flush_threshold setting"

This reverts commit a58e9d09.

Triggers segfaults with 32-bit kernels on PA8500 machines.
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/cache.c

@@ -403,7 +403,7 @@ void __init parisc_setup_cache_timing(void)
 {
 	unsigned long rangetime, alltime;
 	unsigned long size;
-	unsigned long threshold, threshold2;
+	unsigned long threshold;
 
 	alltime = mfctl(16);
 	flush_data_cache();
@@ -418,20 +418,8 @@ void __init parisc_setup_cache_timing(void)
 		alltime, size, rangetime);
 
 	threshold = L1_CACHE_ALIGN(size * alltime / rangetime);
-
-	/*
-	 * The threshold computed above isn't very reliable since the
-	 * flush times depend greatly on the percentage of dirty lines
-	 * in the flush range. Further, the whole cache time doesn't
-	 * include the time to refill lines that aren't in the mm/vma
-	 * being flushed. By timing glibc build and checks on mako cpus,
-	 * the following formula seems to work reasonably well. The
-	 * value from the timing calculation is too small, and increases
-	 * build and check times by almost a factor two.
-	 */
-	threshold2 = cache_info.dc_size * num_online_cpus();
-	if (threshold2 > threshold)
-		threshold = threshold2;
+	if (threshold > cache_info.dc_size)
+		threshold = cache_info.dc_size;
 	if (threshold)
 		parisc_cache_flush_threshold = threshold;
 	printk(KERN_INFO "Cache flush threshold set to %lu KiB\n",