From: Xiang Chen <chenxiang66@xxxxxxxxxxxxx> For a system with PAGE_SIZE of 16K or 64K, the size every time we want to alloc may be small like 4K, but for function dmam_alloc_coherent(), the least size it allocates is PAGE_SIZE, so it will waste much memory for the situation. To solve the issue, limit the minimum allocation size of slot buf to PAGE_SIZE. Signed-off-by: Xiang Chen <chenxiang66@xxxxxxxxxxxxx> Signed-off-by: John Garry <john.garry@xxxxxxxxxx> --- drivers/scsi/hisi_sas/hisi_sas_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 7efa8dfa0cc1..39ae69e42d26 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -2389,7 +2389,7 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba) else sz_slot_buf_ru = sizeof(struct hisi_sas_slot_buf_table); sz_slot_buf_ru = roundup(sz_slot_buf_ru, 64); - s = lcm(max_command_entries_ru, sz_slot_buf_ru); + s = max(lcm(max_command_entries_ru, sz_slot_buf_ru), PAGE_SIZE); blk_cnt = (max_command_entries_ru * sz_slot_buf_ru) / s; slots_per_blk = s / sz_slot_buf_ru; -- 2.17.1
