alpha: cleanup in bitops.h

Remove 2 functions private to the alpha implemetation,
in favor of similar functions in <linux/log2.h>.

Provide a more efficient version of the fls64 function
for pre-ev67 alphas.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/kernel/pci_iommu.c

@@ -7,6 +7,7 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/bootmem.h>
+#include <linux/log2.h>
 
 #include <asm/io.h>
 #include <asm/hwrpb.h>
@@ -53,7 +54,7 @@ size_for_memory(unsigned long max)
 {
 	unsigned long mem = max_low_pfn << PAGE_SHIFT;
 	if (mem < max)
-		max = 1UL << ceil_log2(mem);
+		max = roundup_pow_of_two(mem);
 	return max;
 }
 

arch/alpha/kernel/setup.c

@@ -43,6 +43,7 @@
 #include <linux/notifier.h>
 #include <asm/setup.h>
 #include <asm/io.h>
+#include <linux/log2.h>
 
 extern struct atomic_notifier_head panic_notifier_list;
 static int alpha_panic_event(struct notifier_block *, unsigned long, void *);
@@ -1303,7 +1304,7 @@ external_cache_probe(int minsize, int width)
 	long size = minsize, maxsize = MAX_BCACHE_SIZE * 2;
 
 	if (maxsize > (max_low_pfn + 1) << PAGE_SHIFT)
-		maxsize = 1 << (floor_log2(max_low_pfn + 1) + PAGE_SHIFT);
+		maxsize = 1 << (ilog2(max_low_pfn + 1) + PAGE_SHIFT);
 
 	/* Get the first block cached. */
 	read_mem_block(__va(0), stride, size);