zram: do not mark idle slots that cannot be idle

zram: do not mark idle slots that cannot be idle

[ Upstream commit b967fa1ba72b5da2b6d9bf95f0b13420a59e0701 ]

ZRAM_SAME slots cannot be post-processed (writeback or recompress) so do
not mark them ZRAM_IDLE.  Same with ZRAM_WB slots, they cannot be
ZRAM_IDLE because they are not in zsmalloc pool anymore.

Link: https://lkml.kernel.org/r/20240917021020.883356-6-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: d37da422edb0 ("zram: clear IDLE flag in mark_idle()")
Signed-off-by: Sasha Levin <sashal@kernel.org>