[PATCH 1/2] RDMA/ocrdma: Use bitmap_zalloc() when applicable

[PATCH 1/2] RDMA/ocrdma: Use bitmap_zalloc() when applicable

[Christophe JAILLET]

Use 'bitmap_zalloc()' to simplify code, improve the semantic and avoid some
open-coded arithmetic in allocator arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/infiniband/hw/ocrdma/ocrdma_hw.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index c51c3f40700e..265a581133dc 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -1506,7 +1506,6 @@ int ocrdma_mbx_dealloc_pd(struct ocrdma_dev *dev, struct ocrdma_pd *pd)
 static int ocrdma_mbx_alloc_pd_range(struct ocrdma_dev *dev)
 {
 	int status = -ENOMEM;
-	size_t pd_bitmap_size;
 	struct ocrdma_alloc_pd_range *cmd;
 	struct ocrdma_alloc_pd_range_rsp *rsp;
 
@@ -1528,10 +1527,8 @@ static int ocrdma_mbx_alloc_pd_range(struct ocrdma_dev *dev)
 			dev->pd_mgr->pd_dpp_start = rsp->dpp_page_pdid &
 					OCRDMA_ALLOC_PD_RNG_RSP_START_PDID_MASK;
 			dev->pd_mgr->max_dpp_pd = rsp->pd_count;
-			pd_bitmap_size =
-				BITS_TO_LONGS(rsp->pd_count) * sizeof(long);
-			dev->pd_mgr->pd_dpp_bitmap = kzalloc(pd_bitmap_size,
-							     GFP_KERNEL);
+			dev->pd_mgr->pd_dpp_bitmap = bitmap_zalloc(rsp->pd_count,
+								   GFP_KERNEL);
 		}
 		kfree(cmd);
 	}
@@ -1547,9 +1544,8 @@ static int ocrdma_mbx_alloc_pd_range(struct ocrdma_dev *dev)
 		dev->pd_mgr->pd_norm_start = rsp->dpp_page_pdid &
 					OCRDMA_ALLOC_PD_RNG_RSP_START_PDID_MASK;
 		dev->pd_mgr->max_normal_pd = rsp->pd_count;
-		pd_bitmap_size = BITS_TO_LONGS(rsp->pd_count) * sizeof(long);
-		dev->pd_mgr->pd_norm_bitmap = kzalloc(pd_bitmap_size,
-						      GFP_KERNEL);
+		dev->pd_mgr->pd_norm_bitmap = bitmap_zalloc(rsp->pd_count,
+							    GFP_KERNEL);
 	}
 	kfree(cmd);
 
@@ -1611,8 +1607,8 @@ void ocrdma_alloc_pd_pool(struct ocrdma_dev *dev)
 static void ocrdma_free_pd_pool(struct ocrdma_dev *dev)
 {
 	ocrdma_mbx_dealloc_pd_range(dev);
-	kfree(dev->pd_mgr->pd_norm_bitmap);
-	kfree(dev->pd_mgr->pd_dpp_bitmap);
+	bitmap_free(dev->pd_mgr->pd_norm_bitmap);
+	bitmap_free(dev->pd_mgr->pd_dpp_bitmap);
 	kfree(dev->pd_mgr);
 }
 
-- 
2.30.2

[PATCH 2/2] RDMA/ocrdma: Simplify code in 'ocrdma_search_mmap()'

[Christophe JAILLET]

'pd_bitmap' does not need to be const. Without it, it is possible to use
this variable when calling '__set_bit()'. This is less verbose and more
logical.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
index 72629e706191..bfa7aad92ead 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
@@ -247,13 +247,13 @@ static bool ocrdma_search_mmap(struct ocrdma_ucontext *uctx, u64 phy_addr,
 static u16 _ocrdma_pd_mgr_get_bitmap(struct ocrdma_dev *dev, bool dpp_pool)
 {
 	u16 pd_bitmap_idx = 0;
-	const unsigned long *pd_bitmap;
+	unsigned long *pd_bitmap;
 
 	if (dpp_pool) {
 		pd_bitmap = dev->pd_mgr->pd_dpp_bitmap;
 		pd_bitmap_idx = find_first_zero_bit(pd_bitmap,
 						    dev->pd_mgr->max_dpp_pd);
-		__set_bit(pd_bitmap_idx, dev->pd_mgr->pd_dpp_bitmap);
+		__set_bit(pd_bitmap_idx, pd_bitmap);
 		dev->pd_mgr->pd_dpp_count++;
 		if (dev->pd_mgr->pd_dpp_count > dev->pd_mgr->pd_dpp_thrsh)
 			dev->pd_mgr->pd_dpp_thrsh = dev->pd_mgr->pd_dpp_count;
@@ -261,7 +261,7 @@ static u16 _ocrdma_pd_mgr_get_bitmap(struct ocrdma_dev *dev, bool dpp_pool)
 		pd_bitmap = dev->pd_mgr->pd_norm_bitmap;
 		pd_bitmap_idx = find_first_zero_bit(pd_bitmap,
 						    dev->pd_mgr->max_normal_pd);
-		__set_bit(pd_bitmap_idx, dev->pd_mgr->pd_norm_bitmap);
+		__set_bit(pd_bitmap_idx, pd_bitmap);
 		dev->pd_mgr->pd_norm_count++;
 		if (dev->pd_mgr->pd_norm_count > dev->pd_mgr->pd_norm_thrsh)
 			dev->pd_mgr->pd_norm_thrsh = dev->pd_mgr->pd_norm_count;
-- 
2.30.2

Re: [PATCH 1/2] RDMA/ocrdma: Use bitmap_zalloc() when applicable

[Jason Gunthorpe]

On Thu, Nov 25, 2021 at 08:34:10PM +0100, Christophe JAILLET wrote:
> Use 'bitmap_zalloc()' to simplify code, improve the semantic and avoid some
> open-coded arithmetic in allocator arguments.
> 
> Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
> consistency.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
>  drivers/infiniband/hw/ocrdma/ocrdma_hw.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)

This and the next applied to for-next, thanks

Jason