[PATCH 0/8] Fix minor address type errors

[PATCH 0/8] Fix minor address type errors

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 1275 bytes --]

Various bits of code are mixing making assumptions about the size of
dma_addr_t or resource_size_t, or mixing up pointer and integer types.

All these fixes are based on compiler warnings and so far as I can see
the bugs are practically harmless.

Ben.

Ben Hutchings (8):
  IB/cxgb4: Fix formatting of physical address
  farsync: Fix confusion about DMA address and buffer offset types
  drm: Do not include page offset in argument to virt_to_page()
  drm: Pass pointers to virt_to_page()
  [SCSI] tgt: Pass pointers to virt_to_page(), not integers
  uio: Pass pointers to virt_to_page(), not integers
  rds: Pass pointers to virt_to_page(), not integers
  [SCSI] pmcraid: Pass pointers to access_ok(), not integers

 drivers/gpu/drm/drm_pci.c            |  4 ++--
 drivers/gpu/drm/drm_vm.c             |  2 +-
 drivers/infiniband/hw/cxgb4/device.c |  4 ++--
 drivers/net/wan/farsync.c            | 19 +++++++------------
 drivers/scsi/pmcraid.c               |  3 ++-
 drivers/scsi/scsi_tgt_if.c           |  2 +-
 drivers/uio/uio.c                    |  6 ++++--
 net/rds/message.c                    |  2 +-
 8 files changed, 20 insertions(+), 22 deletions(-)


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 0/8] Fix minor address type errors

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 1275 bytes --]

Various bits of code are mixing making assumptions about the size of
dma_addr_t or resource_size_t, or mixing up pointer and integer types.

All these fixes are based on compiler warnings and so far as I can see
the bugs are practically harmless.

Ben.

Ben Hutchings (8):
  IB/cxgb4: Fix formatting of physical address
  farsync: Fix confusion about DMA address and buffer offset types
  drm: Do not include page offset in argument to virt_to_page()
  drm: Pass pointers to virt_to_page()
  [SCSI] tgt: Pass pointers to virt_to_page(), not integers
  uio: Pass pointers to virt_to_page(), not integers
  rds: Pass pointers to virt_to_page(), not integers
  [SCSI] pmcraid: Pass pointers to access_ok(), not integers

 drivers/gpu/drm/drm_pci.c            |  4 ++--
 drivers/gpu/drm/drm_vm.c             |  2 +-
 drivers/infiniband/hw/cxgb4/device.c |  4 ++--
 drivers/net/wan/farsync.c            | 19 +++++++------------
 drivers/scsi/pmcraid.c               |  3 ++-
 drivers/scsi/scsi_tgt_if.c           |  2 +-
 drivers/uio/uio.c                    |  6 ++++--
 net/rds/message.c                    |  2 +-
 8 files changed, 20 insertions(+), 22 deletions(-)


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Ben Hutchings]

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Physical addresses may be wider than virtual addresses (e.g. on i386
with PAE) and must not be formatted with %p.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben-/+tVBieCtBitmTQ+vhA3Yw@public.gmane.org>
---
The resource could also be printed using '%pR' or '%pr', but that makes
a bigger change to the output.

Ben.

 drivers/infiniband/hw/cxgb4/device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index 33d2cc6..4a03385 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 	     rdev->lldi.vr->qp.size,
 	     rdev->lldi.vr->cq.start,
 	     rdev->lldi.vr->cq.size);
-	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
+	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
 	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
-	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
+	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
 	     rdev->lldi.db_reg,
 	     rdev->lldi.gts_reg,
 	     rdev->qpshift, rdev->qpmask,


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 1339 bytes --]

Physical addresses may be wider than virtual addresses (e.g. on i386
with PAE) and must not be formatted with %p.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
The resource could also be printed using '%pR' or '%pr', but that makes
a bigger change to the output.

Ben.

 drivers/infiniband/hw/cxgb4/device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index 33d2cc6..4a03385 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 	     rdev->lldi.vr->qp.size,
 	     rdev->lldi.vr->cq.start,
 	     rdev->lldi.vr->cq.size);
-	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
+	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
 	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
-	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
+	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
 	     rdev->lldi.db_reg,
 	     rdev->lldi.gts_reg,
 	     rdev->qpshift, rdev->qpmask,


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 2809 bytes --]

Use dma_addr_t for DMA address parameters and u32 for shared memory
offset parameters.

Do not assume that dma_addr_t is the same as unsigned long; it will
not be in PAE configurations.  Truncate DMA addresses to 32 bits when
printing them.  This is OK because the DMA mask for this device is
32-bit (per default).

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/net/wan/farsync.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
index 3f0c4f2..4b36676 100644
--- a/drivers/net/wan/farsync.c
+++ b/drivers/net/wan/farsync.c
@@ -886,15 +886,13 @@ fst_rx_dma_complete(struct fst_card_info *card, struct fst_port_info *port,
  *      Receive a frame through the DMA
  */
 static inline void
-fst_rx_dma(struct fst_card_info *card, dma_addr_t skb,
-	   dma_addr_t mem, int len)
+fst_rx_dma(struct fst_card_info *card, dma_addr_t skb, u32 mem, int len)
 {
 	/*
 	 * This routine will setup the DMA and start it
 	 */
 
-	dbg(DBG_RX, "In fst_rx_dma %lx %lx %d\n",
-	    (unsigned long) skb, (unsigned long) mem, len);
+	dbg(DBG_RX, "In fst_rx_dma %x %x %d\n", (u32)skb, mem, len);
 	if (card->dmarx_in_progress) {
 		dbg(DBG_ASS, "In fst_rx_dma while dma in progress\n");
 	}
@@ -915,20 +913,19 @@ fst_rx_dma(struct fst_card_info *card, dma_addr_t skb,
  *      Send a frame through the DMA
  */
 static inline void
-fst_tx_dma(struct fst_card_info *card, unsigned char *skb,
-	   unsigned char *mem, int len)
+fst_tx_dma(struct fst_card_info *card, dma_addr_t skb, u32 mem, int len)
 {
 	/*
 	 * This routine will setup the DMA and start it.
 	 */
 
-	dbg(DBG_TX, "In fst_tx_dma %p %p %d\n", skb, mem, len);
+	dbg(DBG_TX, "In fst_tx_dma %x %x %d\n", (u32)skb, mem, len);
 	if (card->dmatx_in_progress) {
 		dbg(DBG_ASS, "In fst_tx_dma while dma in progress\n");
 	}
 
-	outl((unsigned long) skb, card->pci_conf + DMAPADR1);	/* Copy from here */
-	outl((unsigned long) mem, card->pci_conf + DMALADR1);	/* to here */
+	outl(skb, card->pci_conf + DMAPADR1);	/* Copy from here */
+	outl(mem, card->pci_conf + DMALADR1);	/* to here */
 	outl(len, card->pci_conf + DMASIZ1);	/* for this length */
 	outl(0x000000004, card->pci_conf + DMADPR1);	/* In this direction */
 
@@ -1405,9 +1402,7 @@ do_bottom_half_tx(struct fst_card_info *card)
 					card->dma_len_tx = skb->len;
 					card->dma_txpos = port->txpos;
 					fst_tx_dma(card,
-						   (char *) card->
-						   tx_dma_handle_card,
-						   (char *)
+						   card->tx_dma_handle_card,
 						   BUF_OFFSET(txBuffer[pi]
 							      [port->txpos][0]),
 						   skb->len);

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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[PATCH 3/8] drm: Do not include page offset in argument to virt_to_page()

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 917 bytes --]

By definition, the page offset will not affect the result.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/gpu/drm/drm_vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index b5c5af7..8ef6503 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -301,7 +301,7 @@ static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 	offset = (unsigned long)vmf->virtual_address - vma->vm_start;	/* vm_[pg]off[set] should be 0 */
 	page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
-	page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
+	page = virt_to_page(dma->pagelist[page_nr]);
 
 	get_page(page);
 	vmf->page = page;


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 4/8] drm: Pass pointers to virt_to_page()

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 2052 bytes --]

Most architectures define virt_to_page() as a macro that casts its
argument such that an argument of type unsigned long will be accepted
without complaint.  However, the proper type is void *, and passing
unsigned long results in a warning on MIPS.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/gpu/drm/drm_pci.c | 4 ++--
 drivers/gpu/drm/drm_vm.c  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index 1f96cee..4c47954 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -80,7 +80,7 @@ drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t ali
 	/* Reserve */
 	for (addr = (unsigned long)dmah->vaddr, sz = size;
 	     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
-		SetPageReserved(virt_to_page(addr));
+		SetPageReserved(virt_to_page((void *)addr));
 	}
 
 	return dmah;
@@ -103,7 +103,7 @@ void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
 		/* Unreserve */
 		for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
 		     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
-			ClearPageReserved(virt_to_page(addr));
+			ClearPageReserved(virt_to_page((void *)addr));
 		}
 		dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
 				  dmah->busaddr);
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index 8ef6503..93e95d7 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -301,7 +301,7 @@ static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 	offset = (unsigned long)vmf->virtual_address - vma->vm_start;	/* vm_[pg]off[set] should be 0 */
 	page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
-	page = virt_to_page(dma->pagelist[page_nr]);
+	page = virt_to_page((void *)dma->pagelist[page_nr]);
 
 	get_page(page);
 	vmf->page = page;


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 5/8] [SCSI] tgt: Pass pointers to virt_to_page(), not integers

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 1026 bytes --]

Most architectures define virt_to_page() as a macro that casts its
argument such that an argument of type unsigned long will be accepted
without complaint.  However, the proper type is void *, and passing
unsigned long results in a warning on MIPS.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/scsi/scsi_tgt_if.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c
index 6209110..7199753 100644
--- a/drivers/scsi/scsi_tgt_if.c
+++ b/drivers/scsi/scsi_tgt_if.c
@@ -286,7 +286,7 @@ static int uspace_ring_map(struct vm_area_struct *vma, unsigned long addr,
 	int i, err;
 
 	for (i = 0; i < TGT_RING_PAGES; i++) {
-		struct page *page = virt_to_page(ring->tr_pages[i]);
+		struct page *page = virt_to_page((void *)ring->tr_pages[i]);
 		err = vm_insert_page(vma, addr, page);
 		if (err)
 			return err;


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 6/8] uio: Pass pointers to virt_to_page(), not integers

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 1448 bytes --]

Most architectures define virt_to_page() as a macro that casts its
argument such that an argument of type unsigned long will be accepted
without complaint.  However, the proper type is void *, and passing
unsigned long results in a warning on MIPS.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/uio/uio.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 11d4e0a..ef30ec9 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -601,6 +601,7 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	struct uio_device *idev = vma->vm_private_data;
 	struct page *page;
 	unsigned long offset;
+	void *addr;
 
 	int mi = uio_find_mem_index(vma);
 	if (mi < 0)
@@ -612,10 +613,11 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	 */
 	offset = (vmf->pgoff - mi) << PAGE_SHIFT;
 
+	addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset;
 	if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
-		page = virt_to_page(idev->info->mem[mi].addr + offset);
+		page = virt_to_page(addr);
 	else
-		page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset);
+		page = vmalloc_to_page(addr);
 	get_page(page);
 	vmf->page = page;
 	return 0;


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 7/8] rds: Pass pointers to virt_to_page(), not integers

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 923 bytes --]

Most architectures define virt_to_page() as a macro that casts its
argument such that an argument of type unsigned long will be accepted
without complaint.  However, the proper type is void *, and passing
unsigned long results in a warning on MIPS.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 net/rds/message.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rds/message.c b/net/rds/message.c
index aba232f..1913fc9 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -257,7 +257,7 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
 
 	for (i = 0; i < rm->data.op_nents; ++i) {
 		sg_set_page(&rm->data.op_sg[i],
-				virt_to_page(page_addrs[i]),
+				virt_to_page((void *)page_addrs[i]),
 				PAGE_SIZE, 0);
 	}
 


-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

[PATCH 8/8] [SCSI] pmcraid: Pass pointers to access_ok(), not integers

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 938 bytes --]

Most architectures define access_ok() as a macro that casts its
argument such that an argument of type unsigned long will be accepted
without complaint.  However, the proper type is void *, and passing
unsigned long results in a warning on sparc64.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/scsi/pmcraid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index 1eb7b028..4e0a2f3 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -3794,7 +3794,8 @@ static long pmcraid_ioctl_passthrough(
 	}
 
 	if (request_size > 0) {
-		rc = access_ok(access, arg, request_offset + request_size);
+		rc = access_ok(access, (void *)arg,
+			       request_offset + request_size);
 
 		if (!rc) {
 			rc = -EFAULT;

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 828 bytes --]

Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Joe Perches]

On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> Physical addresses may be wider than virtual addresses (e.g. on i386
> with PAE) and must not be formatted with %p.

%pa works.  %pa also prefixes with 0x.

> diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
[]
> @@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
>  	     rdev->lldi.vr->qp.size,
>  	     rdev->lldi.vr->cq.start,
>  	     rdev->lldi.vr->cq.size);
> -	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
> +	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
>  	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
>  	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
> -	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
> +	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
>  	     rdev->lldi.db_reg,
>  	     rdev->lldi.gts_reg,
>  	     rdev->qpshift, rdev->qpmask,
> 
> 



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Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Joe Perches]

On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> Physical addresses may be wider than virtual addresses (e.g. on i386
> with PAE) and must not be formatted with %p.

%pa works.  %pa also prefixes with 0x.

> diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
[]
> @@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
>  	     rdev->lldi.vr->qp.size,
>  	     rdev->lldi.vr->cq.start,
>  	     rdev->lldi.vr->cq.size);
> -	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
> +	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
>  	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
>  	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
> -	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
> +	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
>  	     rdev->lldi.db_reg,
>  	     rdev->lldi.gts_reg,
>  	     rdev->qpshift, rdev->qpmask,
> 
> 

Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Ben Hutchings]

[-- Attachment #1: Type: text/plain, Size: 1293 bytes --]

On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > Physical addresses may be wider than virtual addresses (e.g. on i386
> > with PAE) and must not be formatted with %p.
> 
> %pa works.  %pa also prefixes with 0x.

Only as long as pci_resource_start() happens to be an lvalue.  I'd
rather not introduce that assumption.

Ben.

> > diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
> []
> > @@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
> >  	     rdev->lldi.vr->qp.size,
> >  	     rdev->lldi.vr->cq.start,
> >  	     rdev->lldi.vr->cq.size);
> > -	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
> > +	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
> >  	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
> >  	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
> > -	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
> > +	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
> >  	     rdev->lldi.db_reg,
> >  	     rdev->lldi.gts_reg,
> >  	     rdev->qpshift, rdev->qpmask,
> > 
> > 
> 
> 
> 

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Ben Hutchings]

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On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > Physical addresses may be wider than virtual addresses (e.g. on i386
> > with PAE) and must not be formatted with %p.
> 
> %pa works.  %pa also prefixes with 0x.

Only as long as pci_resource_start() happens to be an lvalue.  I'd
rather not introduce that assumption.

Ben.

> > diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
> []
> > @@ -602,10 +602,10 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
> >  	     rdev->lldi.vr->qp.size,
> >  	     rdev->lldi.vr->cq.start,
> >  	     rdev->lldi.vr->cq.size);
> > -	PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
> > +	PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
> >  	     "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
> >  	     (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
> > -	     (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
> > +	     (u64)pci_resource_start(rdev->lldi.pdev, 2),
> >  	     rdev->lldi.db_reg,
> >  	     rdev->lldi.gts_reg,
> >  	     rdev->qpshift, rdev->qpmask,
> > 
> > 
> 
> 
> 

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Joe Perches]

On Sun, 2013-10-27 at 22:02 +0000, Ben Hutchings wrote:
> On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> > On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > > Physical addresses may be wider than virtual addresses (e.g. on i386
> > > with PAE) and must not be formatted with %p.
> > 
> > %pa works.  %pa also prefixes with 0x.
> 
> Only as long as pci_resource_start() happens to be an lvalue.  I'd
> rather not introduce that assumption.

pci_resource_start returns a resource_size_t which is a phys_addr_t.

Changing that from an lvalue would cause a _lot_ of breakage.


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Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Joe Perches]

On Sun, 2013-10-27 at 22:02 +0000, Ben Hutchings wrote:
> On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> > On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > > Physical addresses may be wider than virtual addresses (e.g. on i386
> > > with PAE) and must not be formatted with %p.
> > 
> > %pa works.  %pa also prefixes with 0x.
> 
> Only as long as pci_resource_start() happens to be an lvalue.  I'd
> rather not introduce that assumption.

pci_resource_start returns a resource_size_t which is a phys_addr_t.

Changing that from an lvalue would cause a _lot_ of breakage.

Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Ben Hutchings]

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On Sun, 2013-10-27 at 15:14 -0700, Joe Perches wrote:
> On Sun, 2013-10-27 at 22:02 +0000, Ben Hutchings wrote:
> > On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> > > On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > > > Physical addresses may be wider than virtual addresses (e.g. on i386
> > > > with PAE) and must not be formatted with %p.
> > > 
> > > %pa works.  %pa also prefixes with 0x.
> > 
> > Only as long as pci_resource_start() happens to be an lvalue.  I'd
> > rather not introduce that assumption.
> 
> pci_resource_start returns a resource_size_t which is a phys_addr_t.
> 
> Changing that from an lvalue would cause a _lot_ of breakage.

I don't think so.  This doesn't find anything:
    git grep '&[ (]*pci_resource_start'

and I was able to build drivers/{net,pci,scsi}/ successfully with
pci_resource_start() changed to an inline function.

Ben.

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Ben Hutchings]

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On Sun, 2013-10-27 at 15:14 -0700, Joe Perches wrote:
> On Sun, 2013-10-27 at 22:02 +0000, Ben Hutchings wrote:
> > On Sun, 2013-10-27 at 14:58 -0700, Joe Perches wrote:
> > > On Sun, 2013-10-27 at 21:50 +0000, Ben Hutchings wrote:
> > > > Physical addresses may be wider than virtual addresses (e.g. on i386
> > > > with PAE) and must not be formatted with %p.
> > > 
> > > %pa works.  %pa also prefixes with 0x.
> > 
> > Only as long as pci_resource_start() happens to be an lvalue.  I'd
> > rather not introduce that assumption.
> 
> pci_resource_start returns a resource_size_t which is a phys_addr_t.
> 
> Changing that from an lvalue would cause a _lot_ of breakage.

I don't think so.  This doesn't find anything:
    git grep '&[ (]*pci_resource_start'

and I was able to build drivers/{net,pci,scsi}/ successfully with
pci_resource_start() changed to an inline function.

Ben.

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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Re: [PATCH 1/8] IB/cxgb4: Fix formatting of physical address

[Joe Perches]

On Sun, 2013-10-27 at 22:26 +0000, Ben Hutchings wrote:
> I don't think so.  This doesn't find anything:
>     git grep '&[ (]*pci_resource_start'
> and I was able to build drivers/{net,pci,scsi}/ successfully with
> pci_resource_start() changed to an inline function.

Hi again Ben.  You're right.

It could be nice though to have some mechanism to get from
a pci_resource_start/end that could be emitted via %pa
without an intermediate or casting like
(unsigned long long)pci_resource_<foo>(struct resource *)

There are at least a few dozen uses of dmesg/seq_printf with
%llx or %lx and (some_cast)pci_resource_<foo> that could be
converted.

Re: [PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

[David Miller]

From: Ben Hutchings <ben@decadent.org.uk>
Date: Sun, 27 Oct 2013 21:51:44 +0000

> -	dbg(DBG_TX, "In fst_tx_dma %p %p %d\n", skb, mem, len);
> +	dbg(DBG_TX, "In fst_tx_dma %x %x %d\n", (u32)skb, mem, len);

Please use %p for the skb pointer instead of casting it (which btw
will introduce a warning on 64-bit).

Re: [PATCH 7/8] rds: Pass pointers to virt_to_page(), not integers

[David Miller]

From: Ben Hutchings <ben@decadent.org.uk>
Date: Sun, 27 Oct 2013 21:54:16 +0000

> Most architectures define virt_to_page() as a macro that casts its
> argument such that an argument of type unsigned long will be accepted
> without complaint.  However, the proper type is void *, and passing
> unsigned long results in a warning on MIPS.
> 
> Compile-tested only.
> 
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

This looks fine:

Acked-by: David S. Miller <davem@davemloft.net>

Re: [PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

[Ben Hutchings]

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On Mon, 2013-10-28 at 00:26 -0400, David Miller wrote:
> From: Ben Hutchings <ben@decadent.org.uk>
> Date: Sun, 27 Oct 2013 21:51:44 +0000
> 
> > -     dbg(DBG_TX, "In fst_tx_dma %p %p %d\n", skb, mem, len);
> > +     dbg(DBG_TX, "In fst_tx_dma %x %x %d\n", (u32)skb, mem, len);
> 
> Please use %p for the skb pointer instead of casting it (which btw
> will introduce a warning on 64-bit).

skb is the DMA address of the data in the sk_buff.  Yes, this is really
unusual naming.

Ben.

-- 
Ben Hutchings
[W]e found...that it wasn't as easy to get programs right as we had thought.
... I realized that a large part of my life from then on was going to be spent
in finding mistakes in my own programs. - Maurice Wilkes, 1949

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Re: [PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

[David Miller]

From: Ben Hutchings <ben@decadent.org.uk>
Date: Mon, 28 Oct 2013 04:51:25 +0000

> On Mon, 2013-10-28 at 00:26 -0400, David Miller wrote:
>> From: Ben Hutchings <ben@decadent.org.uk>
>> Date: Sun, 27 Oct 2013 21:51:44 +0000
>> 
>> > -     dbg(DBG_TX, "In fst_tx_dma %p %p %d\n", skb, mem, len);
>> > +     dbg(DBG_TX, "In fst_tx_dma %x %x %d\n", (u32)skb, mem, len);
>> 
>> Please use %p for the skb pointer instead of casting it (which btw
>> will introduce a warning on 64-bit).
> 
> skb is the DMA address of the data in the sk_buff.  Yes, this is really
> unusual naming.

Hmmm, Ok then I guess. :-/

RE: [PATCH 7/8] rds: Pass pointers to virt_to_page(), not integers

[Venkat Venkatsubra]

-----Original Message-----
From: David Miller [mailto:davem@davemloft.net] 
Sent: Sunday, October 27, 2013 11:27 PM
To: ben@decadent.org.uk
Cc: Venkat Venkatsubra; linux-kernel@vger.kernel.org; rds-devel@oss.oracle.com; netdev@vger.kernel.org
Subject: Re: [PATCH 7/8] rds: Pass pointers to virt_to_page(), not integers

From: Ben Hutchings <ben@decadent.org.uk>
Date: Sun, 27 Oct 2013 21:54:16 +0000

> Most architectures define virt_to_page() as a macro that casts its 
> argument such that an argument of type unsigned long will be accepted 
> without complaint.  However, the proper type is void *, and passing 
> unsigned long results in a warning on MIPS.
> 
> Compile-tested only.
> 
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

This looks fine:

Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>