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-rw-r--r--diff.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/diff.c b/diff.c
index 37f99209a0..4f980aded6 100644
--- a/diff.c
+++ b/diff.c
@@ -1759,7 +1759,8 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int
struct stat st;
int pos, len;
- /* We do not read the cache ourselves here, because the
+ /*
+ * We do not read the cache ourselves here, because the
* benchmark with my previous version that always reads cache
* shows that it makes things worse for diff-tree comparing
* two linux-2.6 kernel trees in an already checked out work
@@ -1800,6 +1801,13 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int
return 0;
/*
+ * If ce is marked as "assume unchanged", there is no
+ * guarantee that work tree matches what we are looking for.
+ */
+ if (ce->ce_flags & CE_VALID)
+ return 0;
+
+ /*
* If ce matches the file in the work tree, we can reuse it.
*/
if (ce_uptodate(ce) ||