zram: remove double compression logic
The 2nd trial allocation under per-cpu presumption has been used to prevent regression of allocation failure. However, it makes trouble for maintenance without significant benefit. The slowpath branch is executed extremely rarely: getting there is problematic. Therefore, we delete this branch. Since b09ab054 ("zram: support BDI_CAP_STABLE_WRITES"), zram has used QUEUE_FLAG_STABLE_WRITES to prevent buffer change between 1st and 2nd memory allocations. Since we remove second trial memory allocation logic, we could remove the STABLE_WRITES flag because there is no change buffer to be modified under us. Link: https://lkml.kernel.org/r/20220505094443.11728-1-avromanov@sberdevices.ru Signed-off-by:Alexey Romanov <avromanov@sberdevices.ru> Signed-off-by:
Dmitry Rokosov <ddrokosov@sberdevices.ru> Acked-by:
Minchan Kim <minchan@kernel.org> Reviewed-by:
Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Nitin Gupta <ngupta@vflare.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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