[PATCHv2 2/2] zram: clear IDLE flag in mark_idle()

From: Sergey Senozhatsky
Date: Mon Oct 28 2024 - 11:37:08 EST


If entry does not fulfill current mark_idle() parameters, e.g.
cutoff time, then we should clear its ZRAM_IDLE from previous
mark_idle() invocations.

Consider the following case:
- mark_idle() cutoff time 8h
- mark_idle() cutoff time 4h
- writeback() idle - will writeback entries with cutoff time 8h,
while it should only pick entries with cutoff time 4h

The bug was reported by Shin Kawamura.

Fixes: 755804d16965 ("zram: introduce an aged idle interface")
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index a16dbffcdca3..cee49bb0126d 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -410,6 +410,8 @@ static void mark_idle(struct zram *zram, ktime_t cutoff)
#endif
if (is_idle)
zram_set_flag(zram, index, ZRAM_IDLE);
+ else
+ zram_clear_flag(zram, index, ZRAM_IDLE);
zram_slot_unlock(zram, index);
}
}
--
2.47.0.163.g1226f6d8fa-goog