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[PATCH 1/3] infiniband: rxe: avoid 64-bit division

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  [PATCH 1/3] infiniband: rxe: avoid 64-bit division Arnd Bergmann <arnd@arndb.de> - 2016-06-13 15:00 +0200
    [PATCH 3/3] infiniband: rxe: fix 32-bit build warnings Arnd Bergmann <arnd@arndb.de> - 2016-06-13 15:00 +0200
      Re: [PATCH 3/3] infiniband: rxe: fix 32-bit build warnings Moni Shoua <monis@mellanox.com> - 2016-06-13 17:30 +0200
    Re: [PATCH 1/3] infiniband: rxe: avoid 64-bit division Leon Romanovsky <leon@kernel.org> - 2016-06-13 15:20 +0200
      Re: [PATCH 1/3] infiniband: rxe: avoid 64-bit division Moni Shoua <monis@mellanox.com> - 2016-06-13 17:30 +0200

#1420803 — [PATCH 1/3] infiniband: rxe: avoid 64-bit division

The rxe driver fails to build on 32-bit because of a 64-bit division:

In function `rxe_qp_from_attr':
:(.text+0x53158): undefined reference to `__aeabi_uldivmod'

We can easily avoid this division by converting the nanosecond value
into jiffies directly rather than converting to microseconds first.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/infiniband/hw/rxe/rxe_qp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/rxe/rxe_qp.c b/drivers/infiniband/hw/rxe/rxe_qp.c
index aa11ac3032b2..4e7b0985aab8 100644
--- a/drivers/infiniband/hw/rxe/rxe_qp.c
+++ b/drivers/infiniband/hw/rxe/rxe_qp.c
@@ -664,7 +664,7 @@ int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
 			qp->qp_timeout_jiffies = 0;
 		} else {
 			/* According to the spec, timeout = 4.096 * 2 ^ attr->timeout [us] */
-			int j = usecs_to_jiffies((4096ULL << attr->timeout) / 1000);
+			int j = nsecs_to_jiffies(4096ULL << attr->timeout);
 
 			qp->qp_timeout_jiffies = j ? j : 1;
 		}
-- 
2.7.0

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#1420807 — [PATCH 3/3] infiniband: rxe: fix 32-bit build warnings

The new rxe infinband driver passes around pointers that have been
converted to 64-bit integers. This is valid, but causes compile-time
warnings on all 32-bit architectures:

infiniband/hw/rxe/rxe_dma.c: In function 'rxe_dma_map_single':
infiniband/hw/rxe/rxe_dma.c:49:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
  return (u64)cpu_addr;
         ^
infiniband/hw/rxe/rxe_dma.c: In function 'rxe_dma_map_page':
infiniband/hw/rxe/rxe_dma.c:73:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
infiniband/hw/rxe/rxe_dma.c: In function 'rxe_map_sg':
infiniband/hw/rxe/rxe_dma.c:99:10: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
infiniband/hw/rxe/rxe_dma.c: In function 'rxe_dma_alloc_coherent':
infiniband/hw/rxe/rxe_dma.c:143:17: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]

This changes the cast to use 'uintptr_t', which can always be
cast to and from pointer, and can be assigned to and from 64-bit
integers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/infiniband/hw/rxe/rxe_dma.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/rxe/rxe_dma.c b/drivers/infiniband/hw/rxe/rxe_dma.c
index f080bc5bda43..7634c1a81b2b 100644
--- a/drivers/infiniband/hw/rxe/rxe_dma.c
+++ b/drivers/infiniband/hw/rxe/rxe_dma.c
@@ -46,7 +46,7 @@ static u64 rxe_dma_map_single(struct ib_device *dev,
 			      enum dma_data_direction direction)
 {
 	WARN_ON(!valid_dma_direction(direction));
-	return (u64)cpu_addr;
+	return (uintptr_t)cpu_addr;
 }
 
 static void rxe_dma_unmap_single(struct ib_device *dev,
@@ -70,7 +70,7 @@ static u64 rxe_dma_map_page(struct ib_device *dev,
 		goto done;
 	}
 
-	addr = (u64)page_address(page);
+	addr = (uintptr_t)page_address(page);
 	if (addr)
 		addr += offset;
 
@@ -96,7 +96,7 @@ static int rxe_map_sg(struct ib_device *dev, struct scatterlist *sgl,
 	WARN_ON(!valid_dma_direction(direction));
 
 	for_each_sg(sgl, sg, nents, i) {
-		addr = (u64)page_address(sg_page(sg));
+		addr = (uintptr_t)page_address(sg_page(sg));
 		if (!addr) {
 			ret = 0;
 			break;
@@ -140,7 +140,7 @@ static void *rxe_dma_alloc_coherent(struct ib_device *dev, size_t size,
 		addr = page_address(p);
 
 	if (dma_handle)
-		*dma_handle = (u64)addr;
+		*dma_handle = (uintptr_t)addr;
 
 	return addr;
 }
-- 
2.7.0

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#1420987 — Re: [PATCH 3/3] infiniband: rxe: fix 32-bit build warnings

thanks. will be applied to next series.

On Mon, Jun 13, 2016 at 3:54 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> The new rxe infinband driver passes around pointers that have been
> converted to 64-bit integers. This is valid, but causes compile-time
> warnings on all 32-bit architectures:
>
> infiniband/hw/rxe/rxe_dma.c: In function 'rxe_dma_map_single':
> infiniband/hw/rxe/rxe_dma.c:49:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>   return (u64)cpu_addr;
>          ^
> infiniband/hw/rxe/rxe_dma.c: In function 'rxe_dma_map_page':
> infiniband/hw/rxe/rxe_dma.c:73:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> infiniband/hw/rxe/rxe_dma.c: In function 'rxe_map_sg':
> infiniband/hw/rxe/rxe_dma.c:99:10: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> infiniband/hw/rxe/rxe_dma.c: In function 'rxe_dma_alloc_coherent':
> infiniband/hw/rxe/rxe_dma.c:143:17: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>
> This changes the cast to use 'uintptr_t', which can always be
> cast to and from pointer, and can be assigned to and from 64-bit
> integers.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/infiniband/hw/rxe/rxe_dma.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/infiniband/hw/rxe/rxe_dma.c b/drivers/infiniband/hw/rxe/rxe_dma.c
> index f080bc5bda43..7634c1a81b2b 100644
> --- a/drivers/infiniband/hw/rxe/rxe_dma.c
> +++ b/drivers/infiniband/hw/rxe/rxe_dma.c
> @@ -46,7 +46,7 @@ static u64 rxe_dma_map_single(struct ib_device *dev,
>                               enum dma_data_direction direction)
>  {
>         WARN_ON(!valid_dma_direction(direction));
> -       return (u64)cpu_addr;
> +       return (uintptr_t)cpu_addr;
>  }
>
>  static void rxe_dma_unmap_single(struct ib_device *dev,
> @@ -70,7 +70,7 @@ static u64 rxe_dma_map_page(struct ib_device *dev,
>                 goto done;
>         }
>
> -       addr = (u64)page_address(page);
> +       addr = (uintptr_t)page_address(page);
>         if (addr)
>                 addr += offset;
>
> @@ -96,7 +96,7 @@ static int rxe_map_sg(struct ib_device *dev, struct scatterlist *sgl,
>         WARN_ON(!valid_dma_direction(direction));
>
>         for_each_sg(sgl, sg, nents, i) {
> -               addr = (u64)page_address(sg_page(sg));
> +               addr = (uintptr_t)page_address(sg_page(sg));
>                 if (!addr) {
>                         ret = 0;
>                         break;
> @@ -140,7 +140,7 @@ static void *rxe_dma_alloc_coherent(struct ib_device *dev, size_t size,
>                 addr = page_address(p);
>
>         if (dma_handle)
> -               *dma_handle = (u64)addr;
> +               *dma_handle = (uintptr_t)addr;
>
>         return addr;
>  }
> --
> 2.7.0
>
> --
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#1420818

[Multipart message — attachments visible in raw view] — view raw

On Mon, Jun 13, 2016 at 02:54:53PM +0200, Arnd Bergmann wrote:
> The rxe driver fails to build on 32-bit because of a 64-bit division:
> 
> In function `rxe_qp_from_attr':
> :(.text+0x53158): undefined reference to `__aeabi_uldivmod'
> 
> We can easily avoid this division by converting the nanosecond value
> into jiffies directly rather than converting to microseconds first.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks Arnd,
All three patches are applied on topic/rxe now.

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#1420994

thanks. will be applied to next series

On Mon, Jun 13, 2016 at 4:18 PM, Leon Romanovsky <leon@kernel.org> wrote:
> On Mon, Jun 13, 2016 at 02:54:53PM +0200, Arnd Bergmann wrote:
>> The rxe driver fails to build on 32-bit because of a 64-bit division:
>>
>> In function `rxe_qp_from_attr':
>> :(.text+0x53158): undefined reference to `__aeabi_uldivmod'
>>
>> We can easily avoid this division by converting the nanosecond value
>> into jiffies directly rather than converting to microseconds first.
>>
>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>
> Thanks Arnd,
> All three patches are applied on topic/rxe now.

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