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* [PATCH] Fix one error in mthca_alloc
@ 2021-08-26 10:52 kangning
  2021-08-26 12:49 ` Haakon Bugge
  0 siblings, 1 reply; 2+ messages in thread
From: kangning @ 2021-08-26 10:52 UTC (permalink / raw)
  To: linux-rdma; +Cc: kangning

drivers/infiniband/hw/mthca/mthca_allocator.c: alloc->last left unchanged in mthca_alloc, which
has impact on performance of function find_next_zero_bit in mthca_alloc.

Signed-off-by: kangning <kangning18z@ict.ac.cn>
---
 drivers/infiniband/hw/mthca/mthca_allocator.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/mthca/mthca_allocator.c b/drivers/infiniband/hw/mthca/mthca_allocator.c
index aef1d274a14e..e81bb0fcd08e 100644
--- a/drivers/infiniband/hw/mthca/mthca_allocator.c
+++ b/drivers/infiniband/hw/mthca/mthca_allocator.c
@@ -51,6 +51,10 @@ u32 mthca_alloc(struct mthca_alloc *alloc)
 	}
 
 	if (obj < alloc->max) {
+		alloc->last = (obj + 1);
+		if (alloc->last == alloc->max) {
+			alloc->last = 0;
+		}
 		set_bit(obj, alloc->table);
 		obj |= alloc->top;
 	} else
-- 
2.17.1


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2021-08-26 10:52 [PATCH] Fix one error in mthca_alloc kangning
2021-08-26 12:49 ` Haakon Bugge

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