Hi! > > Would it make sense to only do hweight if *bitmap != ~0ULL ? Would it > > make sense to only check for bitflips > bitflips_threshold each 128 > > bytes or something like that? > > I didn't go as far as you did and simply assumed hweight32/64() were > already optimized. Feel free to propose extra improvements.
I'd propose this one (only compile tested, sorry, not sure how to test
this one). If we see ~0UL, there's no need for hweight, and no need to
check number of bitflips. So this should be net win.
Signed-off-by: Pavel Machek <pa...@denx.de>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index b0524f8..96c27ec 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1357,7 +1357,10 @@ static int nand_check_erased_buf(void *buf, int len, int
bitflips_threshold)
for (; len >= sizeof(long);
len -= sizeof(long), bitmap += sizeof(long)) {
- weight = hweight_long(*((unsigned long *)bitmap));
+ unsigned long d = *((unsigned long *)bitmap);
+ if (d == ~0UL)
+ continue;
+ weight = hweight_long(d);
bitflips += BITS_PER_LONG - weight;
if (unlikely(bitflips > bitflips_threshold))
return -EBADMSG;
--
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(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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