[PATCH for-sashiko] mm/damon/core: (fixup) break calc_eligible_bytes() loop if addr overflows

[SeongJae Park <sj@kernel.org>]

As Sashiko pointed out, it could result in infinite loop.  Check the
overflow and break the loop in the case.

Also, wrap the addr setup line to keep the 80 columns limit.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
NOTE:
Writing entire patches for minor Sashiko finding is tiresome.  This is an
experimental posting of fixup patch, wishing Sashiko to review this kind of
incremental fixup.
---
 mm/damon/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 22d6eb3a974d4..9a4220174a61a 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2349,7 +2349,10 @@ static phys_addr_t damos_calc_eligible_bytes(struct damon_ctx *c,
 
 				folio = damon_get_folio(PHYS_PFN(addr));
 				if (!folio) {
-					addr = PAGE_ALIGN_DOWN(addr + PAGE_SIZE);
+					addr = PAGE_ALIGN_DOWN(addr +
+							PAGE_SIZE);
+					if (!addr)
+						break;
 					continue;
 				}
 
-- 
2.47.3