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authorStefan Hajnoczi <stefanha@redhat.com>2015-03-23 15:29:26 +0000
committerKevin Wolf <kwolf@redhat.com>2015-04-28 15:36:08 +0200
commit786a4ea82ec9c87e3a895cf41081029b285a5fe5 (patch)
treefe42f1059c13ea9a27bc9515e5d440d3bb354773 /block/qcow2-refcount.c
parent5863d374a32c98a7adb4c5e49d62de3cdc16d2ea (diff)
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Convert (ffs(val) - 1) to ctz32(val)
This commit was generated mechanically by coccinelle from the following semantic patch: @@ expression val; @@ - (ffs(val) - 1) + ctz32(val) The call sites have been audited to ensure the ffs(0) - 1 == -1 case never occurs (due to input validation, asserts, etc). Therefore we don't need to worry about the fact that ctz32(0) == 32. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1427124571-28598-5-git-send-email-stefanha@redhat.com Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2-refcount.c')
-rw-r--r--block/qcow2-refcount.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 6cbae1d..f47260b 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -2450,7 +2450,7 @@ int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
if (ret < 0) {
return ret;
} else if (ret > 0) {
- int metadata_ol_bitnr = ffs(ret) - 1;
+ int metadata_ol_bitnr = ctz32(ret);
assert(metadata_ol_bitnr < QCOW2_OL_MAX_BITNR);
qcow2_signal_corruption(bs, true, offset, size, "Preventing invalid "