[PATCH 00/22] Add and use pci_zalloc_consistent

[PATCH 00/22] Add and use pci_zalloc_consistent

[Joe Perches]

Adding the helper reduces object code size as well as overall
source size line count.

It's also consistent with all the various zalloc mechanisms
in the kernel.

Done with a simple cocci script and some typing.

Joe Perches (22):
  pci-dma-compat: Add pci_zalloc_consistent helper
  atm: Use pci_zalloc_consistent
  block: Use pci_zalloc_consistent
  crypto: Use pci_zalloc_consistent
  infiniband: Use pci_zalloc_consistent
  i810: Use pci_zalloc_consistent
  media: Use pci_zalloc_consistent
  amd: Use pci_zalloc_consistent
  atl1e: Use pci_zalloc_consistent
  enic: Use pci_zalloc_consistent
  sky2: Use pci_zalloc_consistent
  micrel: Use pci_zalloc_consistent
  qlogic: Use pci_zalloc_consistent
  irda: Use pci_zalloc_consistent
  ipw2100: Use pci_zalloc_consistent
  mwl8k: Use pci_zalloc_consistent
  rtl818x: Use pci_zalloc_consistent
  rtlwifi: Use pci_zalloc_consistent
  scsi: Use pci_zalloc_consistent
  staging: Use pci_zalloc_consistent
  synclink_gt: Use pci_zalloc_consistent
  vme: bridges: Use pci_zalloc_consistent

 drivers/atm/he.c                                   | 31 ++++++++---------
 drivers/atm/idt77252.c                             | 15 ++++----
 drivers/block/DAC960.c                             | 18 +++++-----
 drivers/block/cciss.c                              | 11 +++---
 drivers/block/skd_main.c                           | 25 +++++---------
 drivers/crypto/hifn_795x.c                         |  5 ++-
 drivers/gpu/drm/i810/i810_dma.c                    |  5 ++-
 drivers/infiniband/hw/amso1100/c2.c                |  6 ++--
 drivers/infiniband/hw/nes/nes_hw.c                 | 12 +++----
 drivers/infiniband/hw/nes/nes_verbs.c              |  5 ++-
 drivers/media/common/saa7146/saa7146_core.c        | 15 ++++----
 drivers/media/common/saa7146/saa7146_fops.c        |  5 +--
 drivers/media/pci/bt8xx/bt878.c                    | 16 +++------
 drivers/media/pci/ngene/ngene-core.c               |  7 ++--
 drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c  | 11 ++----
 drivers/media/usb/ttusb-dec/ttusb_dec.c            | 11 ++----
 drivers/net/ethernet/amd/pcnet32.c                 | 16 ++++-----
 drivers/net/ethernet/atheros/atl1e/atl1e_main.c    |  7 ++--
 drivers/net/ethernet/cisco/enic/vnic_dev.c         |  8 ++---
 drivers/net/ethernet/marvell/sky2.c                |  5 ++-
 drivers/net/ethernet/micrel/ksz884x.c              |  7 ++--
 .../net/ethernet/qlogic/netxen/netxen_nic_ctx.c    |  4 +--
 drivers/net/ethernet/qlogic/qlge/qlge_main.c       | 11 +++---
 drivers/net/irda/vlsi_ir.c                         |  4 +--
 drivers/net/wireless/ipw2x00/ipw2100.c             | 16 +++------
 drivers/net/wireless/mwl8k.c                       |  6 ++--
 drivers/net/wireless/rtl818x/rtl8180/dev.c         | 11 +++---
 drivers/net/wireless/rtlwifi/pci.c                 | 17 +++------
 drivers/scsi/3w-sas.c                              |  5 ++-
 drivers/scsi/a100u2w.c                             |  8 ++---
 drivers/scsi/be2iscsi/be_main.c                    | 10 +++---
 drivers/scsi/be2iscsi/be_mgmt.c                    |  3 +-
 drivers/scsi/csiostor/csio_wr.c                    |  8 +----
 drivers/scsi/eata.c                                |  5 ++-
 drivers/scsi/hpsa.c                                |  8 ++---
 drivers/scsi/megaraid/megaraid_mbox.c              | 16 ++++-----
 drivers/scsi/megaraid/megaraid_sas_base.c          |  8 ++---
 drivers/scsi/mesh.c                                |  6 ++--
 drivers/scsi/mvumi.c                               |  9 ++---
 drivers/scsi/pm8001/pm8001_sas.c                   |  5 ++-
 drivers/staging/rtl8192e/rtl8192e/rtl_core.c       | 15 +++-----
 drivers/staging/rtl8192ee/pci.c                    | 37 +++++++-------------
 drivers/staging/rtl8821ae/pci.c                    | 36 +++++++------------
 drivers/staging/slicoss/slicoss.c                  |  9 ++---
 drivers/staging/vt6655/device_main.c               | 40 +++++++---------------
 drivers/tty/synclink_gt.c                          |  5 ++-
 drivers/vme/bridges/vme_ca91cx42.c                 |  6 ++--
 drivers/vme/bridges/vme_tsi148.c                   |  6 ++--
 include/asm-generic/pci-dma-compat.h               |  8 +++++
 49 files changed, 209 insertions(+), 354 deletions(-)

-- 
1.8.1.2.459.gbcd45b4.dirty

[PATCH 19/22] scsi: Use pci_zalloc_consistent

[Joe Perches]

Remove the now unnecessary memset too.

Signed-off-by: Joe Perches <joe@perches.com>
---
 drivers/scsi/3w-sas.c                     |  5 ++---
 drivers/scsi/a100u2w.c                    |  8 ++------
 drivers/scsi/be2iscsi/be_main.c           | 10 ++++------
 drivers/scsi/be2iscsi/be_mgmt.c           |  3 +--
 drivers/scsi/csiostor/csio_wr.c           |  8 +-------
 drivers/scsi/eata.c                       |  5 ++---
 drivers/scsi/hpsa.c                       |  8 +++-----
 drivers/scsi/megaraid/megaraid_mbox.c     | 16 +++++++---------
 drivers/scsi/megaraid/megaraid_sas_base.c |  8 +++-----
 drivers/scsi/mesh.c                       |  6 ++----
 drivers/scsi/mvumi.c                      |  9 +++------
 drivers/scsi/pm8001/pm8001_sas.c          |  5 ++---
 12 files changed, 32 insertions(+), 59 deletions(-)

diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
index 4de3460..6da6cec 100644
--- a/drivers/scsi/3w-sas.c
+++ b/drivers/scsi/3w-sas.c
@@ -683,14 +683,13 @@ static int twl_allocate_memory(TW_Device_Extension *tw_dev, int size, int which)
 	unsigned long *cpu_addr;
 	int retval = 1;
 
-	cpu_addr = pci_alloc_consistent(tw_dev->tw_pci_dev, size*TW_Q_LENGTH, &dma_handle);
+	cpu_addr = pci_zalloc_consistent(tw_dev->tw_pci_dev, size * TW_Q_LENGTH,
+					 &dma_handle);
 	if (!cpu_addr) {
 		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x5, "Memory allocation failed");
 		goto out;
 	}
 
-	memset(cpu_addr, 0, size*TW_Q_LENGTH);
-
 	for (i = 0; i < TW_Q_LENGTH; i++) {
 		switch(which) {
 		case 0:
diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c
index 0163457..d1474611 100644
--- a/drivers/scsi/a100u2w.c
+++ b/drivers/scsi/a100u2w.c
@@ -1125,23 +1125,19 @@ static int inia100_probe_one(struct pci_dev *pdev,
 
 	/* Get total memory needed for SCB */
 	sz = ORC_MAXQUEUE * sizeof(struct orc_scb);
-	host->scb_virt = pci_alloc_consistent(pdev, sz,
-			&host->scb_phys);
+	host->scb_virt = pci_zalloc_consistent(pdev, sz, &host->scb_phys);
 	if (!host->scb_virt) {
 		printk("inia100: SCB memory allocation error\n");
 		goto out_host_put;
 	}
-	memset(host->scb_virt, 0, sz);
 
 	/* Get total memory needed for ESCB */
 	sz = ORC_MAXQUEUE * sizeof(struct orc_extended_scb);
-	host->escb_virt = pci_alloc_consistent(pdev, sz,
-			&host->escb_phys);
+	host->escb_virt = pci_zalloc_consistent(pdev, sz, &host->escb_phys);
 	if (!host->escb_virt) {
 		printk("inia100: ESCB memory allocation error\n");
 		goto out_free_scb_array;
 	}
-	memset(host->escb_virt, 0, sz);
 
 	biosaddr = host->BIOScfg;
 	biosaddr = (biosaddr << 4);
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 5543490..e08def2 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -3538,10 +3538,9 @@ static int be_queue_alloc(struct beiscsi_hba *phba, struct be_queue_info *q,
 	q->len = len;
 	q->entry_size = entry_size;
 	mem->size = len * entry_size;
-	mem->va = pci_alloc_consistent(phba->pcidev, mem->size, &mem->dma);
+	mem->va = pci_zalloc_consistent(phba->pcidev, mem->size, &mem->dma);
 	if (!mem->va)
 		return -ENOMEM;
-	memset(mem->va, 0, mem->size);
 	return 0;
 }
 
@@ -4318,9 +4317,9 @@ static int beiscsi_get_boot_info(struct beiscsi_hba *phba)
 			    "BM_%d : No boot session\n");
 		return ret;
 	}
-	nonemb_cmd.va = pci_alloc_consistent(phba->ctrl.pdev,
-				sizeof(*session_resp),
-				&nonemb_cmd.dma);
+	nonemb_cmd.va = pci_zalloc_consistent(phba->ctrl.pdev,
+					      sizeof(*session_resp),
+					      &nonemb_cmd.dma);
 	if (nonemb_cmd.va == NULL) {
 		beiscsi_log(phba, KERN_ERR,
 			    BEISCSI_LOG_INIT | BEISCSI_LOG_CONFIG,
@@ -4330,7 +4329,6 @@ static int beiscsi_get_boot_info(struct beiscsi_hba *phba)
 		return -ENOMEM;
 	}
 
-	memset(nonemb_cmd.va, 0, sizeof(*session_resp));
 	tag = mgmt_get_session_info(phba, s_handle,
 				    &nonemb_cmd);
 	if (!tag) {
diff --git a/drivers/scsi/be2iscsi/be_mgmt.c b/drivers/scsi/be2iscsi/be_mgmt.c
index 6045aa7..49bf8fb 100644
--- a/drivers/scsi/be2iscsi/be_mgmt.c
+++ b/drivers/scsi/be2iscsi/be_mgmt.c
@@ -900,13 +900,12 @@ free_cmd:
 static int mgmt_alloc_cmd_data(struct beiscsi_hba *phba, struct be_dma_mem *cmd,
 			       int iscsi_cmd, int size)
 {
-	cmd->va = pci_alloc_consistent(phba->ctrl.pdev, size, &cmd->dma);
+	cmd->va = pci_zalloc_consistent(phba->ctrl.pdev, size, &cmd->dma);
 	if (!cmd->va) {
 		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_CONFIG,
 			    "BG_%d : Failed to allocate memory for if info\n");
 		return -ENOMEM;
 	}
-	memset(cmd->va, 0, size);
 	cmd->size = size;
 	be_cmd_hdr_prepare(cmd->va, CMD_SUBSYSTEM_ISCSI, iscsi_cmd, size);
 	return 0;
diff --git a/drivers/scsi/csiostor/csio_wr.c b/drivers/scsi/csiostor/csio_wr.c
index 4255ce2..773da14 100644
--- a/drivers/scsi/csiostor/csio_wr.c
+++ b/drivers/scsi/csiostor/csio_wr.c
@@ -232,7 +232,7 @@ csio_wr_alloc_q(struct csio_hw *hw, uint32_t qsize, uint32_t wrsize,
 
 	q = wrm->q_arr[free_idx];
 
-	q->vstart = pci_alloc_consistent(hw->pdev, qsz, &q->pstart);
+	q->vstart = pci_zalloc_consistent(hw->pdev, qsz, &q->pstart);
 	if (!q->vstart) {
 		csio_err(hw,
 			 "Failed to allocate DMA memory for "
@@ -240,12 +240,6 @@ csio_wr_alloc_q(struct csio_hw *hw, uint32_t qsize, uint32_t wrsize,
 		return -1;
 	}
 
-	/*
-	 * We need to zero out the contents, importantly for ingress,
-	 * since we start with a generatiom bit of 1 for ingress.
-	 */
-	memset(q->vstart, 0, qsz);
-
 	q->type		= type;
 	q->owner	= owner;
 	q->pidx		= q->cidx = q->inc_idx = 0;
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index ebf5736..e3f746d 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1238,8 +1238,8 @@ static int port_detect(unsigned long port_base, unsigned int j,
 		struct eata_config *cf;
 		dma_addr_t cf_dma_addr;
 
-		cf = pci_alloc_consistent(pdev, sizeof(struct eata_config),
-					  &cf_dma_addr);
+		cf = pci_zalloc_consistent(pdev, sizeof(struct eata_config),
+					   &cf_dma_addr);
 
 		if (!cf) {
 			printk
@@ -1249,7 +1249,6 @@ static int port_detect(unsigned long port_base, unsigned int j,
 		}
 
 		/* Set board configuration */
-		memset((char *)cf, 0, sizeof(struct eata_config));
 		cf->len = (ushort) H2DEV16((ushort) 510);
 		cf->ocena = 1;
 
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 31184b3..5c465cd 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -4731,23 +4731,21 @@ static struct CommandList *cmd_special_alloc(struct ctlr_info *h)
 	union u64bit temp64;
 	dma_addr_t cmd_dma_handle, err_dma_handle;
 
-	c = pci_alloc_consistent(h->pdev, sizeof(*c), &cmd_dma_handle);
+	c = pci_zalloc_consistent(h->pdev, sizeof(*c), &cmd_dma_handle);
 	if (c == NULL)
 		return NULL;
-	memset(c, 0, sizeof(*c));
 
 	c->cmd_type = CMD_SCSI;
 	c->cmdindex = -1;
 
-	c->err_info = pci_alloc_consistent(h->pdev, sizeof(*c->err_info),
-		    &err_dma_handle);
+	c->err_info = pci_zalloc_consistent(h->pdev, sizeof(*c->err_info),
+					    &err_dma_handle);
 
 	if (c->err_info == NULL) {
 		pci_free_consistent(h->pdev,
 			sizeof(*c), c, cmd_dma_handle);
 		return NULL;
 	}
-	memset(c->err_info, 0, sizeof(*c->err_info));
 
 	INIT_LIST_HEAD(&c->list);
 	c->busaddr = (u32) cmd_dma_handle;
diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index e2237a9..531dce4 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -998,8 +998,9 @@ megaraid_alloc_cmd_packets(adapter_t *adapter)
 	 * Allocate the common 16-byte aligned memory for the handshake
 	 * mailbox.
 	 */
-	raid_dev->una_mbox64 = pci_alloc_consistent(adapter->pdev,
-			sizeof(mbox64_t), &raid_dev->una_mbox64_dma);
+	raid_dev->una_mbox64 = pci_zalloc_consistent(adapter->pdev,
+						     sizeof(mbox64_t),
+						     &raid_dev->una_mbox64_dma);
 
 	if (!raid_dev->una_mbox64) {
 		con_log(CL_ANN, (KERN_WARNING
@@ -1007,7 +1008,6 @@ megaraid_alloc_cmd_packets(adapter_t *adapter)
 			__LINE__));
 		return -1;
 	}
-	memset(raid_dev->una_mbox64, 0, sizeof(mbox64_t));
 
 	/*
 	 * Align the mailbox at 16-byte boundary
@@ -1026,8 +1026,8 @@ megaraid_alloc_cmd_packets(adapter_t *adapter)
 			align;
 
 	// Allocate memory for commands issued internally
-	adapter->ibuf = pci_alloc_consistent(pdev, MBOX_IBUF_SIZE,
-				&adapter->ibuf_dma_h);
+	adapter->ibuf = pci_zalloc_consistent(pdev, MBOX_IBUF_SIZE,
+					      &adapter->ibuf_dma_h);
 	if (!adapter->ibuf) {
 
 		con_log(CL_ANN, (KERN_WARNING
@@ -1036,7 +1036,6 @@ megaraid_alloc_cmd_packets(adapter_t *adapter)
 
 		goto out_free_common_mbox;
 	}
-	memset(adapter->ibuf, 0, MBOX_IBUF_SIZE);
 
 	// Allocate memory for our SCSI Command Blocks and their associated
 	// memory
@@ -2972,8 +2971,8 @@ megaraid_mbox_product_info(adapter_t *adapter)
 	 * Issue an ENQUIRY3 command to find out certain adapter parameters,
 	 * e.g., max channels, max commands etc.
 	 */
-	pinfo = pci_alloc_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
-			&pinfo_dma_h);
+	pinfo = pci_zalloc_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
+				      &pinfo_dma_h);
 
 	if (pinfo == NULL) {
 		con_log(CL_ANN, (KERN_WARNING
@@ -2982,7 +2981,6 @@ megaraid_mbox_product_info(adapter_t *adapter)
 
 		return -1;
 	}
-	memset(pinfo, 0, sizeof(mraid_pinfo_t));
 
 	mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
 	memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 112799b..22a04e3 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -2038,9 +2038,9 @@ int megasas_sriov_start_heartbeat(struct megasas_instance *instance,
 
 	if (initial) {
 		instance->hb_host_mem =
-			pci_alloc_consistent(instance->pdev,
-					     sizeof(struct MR_CTRL_HB_HOST_MEM),
-					     &instance->hb_host_mem_h);
+			pci_zalloc_consistent(instance->pdev,
+					      sizeof(struct MR_CTRL_HB_HOST_MEM),
+					      &instance->hb_host_mem_h);
 		if (!instance->hb_host_mem) {
 			printk(KERN_DEBUG "megasas: SR-IOV: Couldn't allocate"
 			       " memory for heartbeat host memory for "
@@ -2048,8 +2048,6 @@ int megasas_sriov_start_heartbeat(struct megasas_instance *instance,
 			retval = -ENOMEM;
 			goto out;
 		}
-		memset(instance->hb_host_mem, 0,
-		       sizeof(struct MR_CTRL_HB_HOST_MEM));
 	}
 
 	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index e8a04ae..b4f0552 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -1915,14 +1915,12 @@ static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match)
 	/* We use the PCI APIs for now until the generic one gets fixed
 	 * enough or until we get some macio-specific versions
 	 */
-	dma_cmd_space = pci_alloc_consistent(macio_get_pci_dev(mdev),
-					     ms->dma_cmd_size,
-					     &dma_cmd_bus);
+	dma_cmd_space = pci_zalloc_consistent(macio_get_pci_dev(mdev),
+					      ms->dma_cmd_size, &dma_cmd_bus);
 	if (dma_cmd_space == NULL) {
 		printk(KERN_ERR "mesh: can't allocate DMA table\n");
 		goto out_unmap;
 	}
-	memset(dma_cmd_space, 0, ms->dma_cmd_size);
 
 	ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
        	ms->dma_cmd_space = dma_cmd_space;
diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
index edbee8d..3e716b2 100644
--- a/drivers/scsi/mvumi.c
+++ b/drivers/scsi/mvumi.c
@@ -142,8 +142,8 @@ static struct mvumi_res *mvumi_alloc_mem_resource(struct mvumi_hba *mhba,
 
 	case RESOURCE_UNCACHED_MEMORY:
 		size = round_up(size, 8);
-		res->virt_addr = pci_alloc_consistent(mhba->pdev, size,
-							&res->bus_addr);
+		res->virt_addr = pci_zalloc_consistent(mhba->pdev, size,
+						       &res->bus_addr);
 		if (!res->virt_addr) {
 			dev_err(&mhba->pdev->dev,
 					"unable to allocate consistent mem,"
@@ -151,7 +151,6 @@ static struct mvumi_res *mvumi_alloc_mem_resource(struct mvumi_hba *mhba,
 			kfree(res);
 			return NULL;
 		}
-		memset(res->virt_addr, 0, size);
 		break;
 
 	default:
@@ -258,12 +257,10 @@ static int mvumi_internal_cmd_sgl(struct mvumi_hba *mhba, struct mvumi_cmd *cmd,
 	if (size == 0)
 		return 0;
 
-	virt_addr = pci_alloc_consistent(mhba->pdev, size, &phy_addr);
+	virt_addr = pci_zalloc_consistent(mhba->pdev, size, &phy_addr);
 	if (!virt_addr)
 		return -1;
 
-	memset(virt_addr, 0, size);
-
 	m_sg = (struct mvumi_sgl *) &cmd->frame->payload[0];
 	cmd->frame->sg_counts = 1;
 	cmd->data_buf = virt_addr;
diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 8a44bc9..6107e06 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -123,13 +123,12 @@ int pm8001_mem_alloc(struct pci_dev *pdev, void **virt_addr,
 	u64 align_offset = 0;
 	if (align)
 		align_offset = (dma_addr_t)align - 1;
-	mem_virt_alloc =
-		pci_alloc_consistent(pdev, mem_size + align, &mem_dma_handle);
+	mem_virt_alloc = pci_zalloc_consistent(pdev, mem_size + align,
+					       &mem_dma_handle);
 	if (!mem_virt_alloc) {
 		pm8001_printk("memory allocation error\n");
 		return -1;
 	}
-	memset((void *)mem_virt_alloc, 0, mem_size+align);
 	*pphys_addr = mem_dma_handle;
 	phys_align = (*pphys_addr + align_offset) & ~align_offset;
 	*virt_addr = (void *)mem_virt_alloc + phys_align - *pphys_addr;
-- 
1.8.1.2.459.gbcd45b4.dirty

Re: [PATCH 00/22] Add and use pci_zalloc_consistent

[Luis R. Rodriguez]

On Mon, Jun 23, 2014 at 06:41:28AM -0700, Joe Perches wrote:
> Adding the helper reduces object code size as well as overall
> source size line count.
> 
> It's also consistent with all the various zalloc mechanisms
> in the kernel.
> 
> Done with a simple cocci script and some typing.

Awesome, any chance you can paste in the SmPL? Also any chance
we can get this added to a make coccicheck so that maintainers
moving forward can use that to ensure that no new code is
added that uses the old school API?

  Luis

Re: [PATCH 00/22] Add and use pci_zalloc_consistent

[Joe Perches]

On Mon, 2014-06-23 at 10:25 -0700, Luis R. Rodriguez wrote:
> On Mon, Jun 23, 2014 at 06:41:28AM -0700, Joe Perches wrote:
> > Adding the helper reduces object code size as well as overall
> > source size line count.
> > 
> > It's also consistent with all the various zalloc mechanisms
> > in the kernel.
> > 
> > Done with a simple cocci script and some typing.
> 
> Awesome, any chance you can paste in the SmPL? Also any chance
> we can get this added to a make coccicheck so that maintainers
> moving forward can use that to ensure that no new code is
> added that uses the old school API?

Not many of these are recent.

Arnd Bergmann reasonably suggested that the pci_alloc_consistent
api be converted the the more widely used dma_alloc_coherent.

https://lkml.org/lkml/2014/6/23/513

> Shouldn't these drivers just use the normal dma-mapping API now?

and I replied:

https://lkml.org/lkml/2014/6/23/525

> Maybe.  I wouldn't mind.
> They do seem to have a trivial bit of unnecessary overhead for 
> hwdev == NULL ? NULL : &hwdev->dev

Anyway, here's the little script.
I'm not sure it's worthwhile to add it though.

$ cat ./scripts/coccinelle/api/alloc/pci_zalloc_consistent.cocci
///
/// Use pci_zalloc_consistent rather than
///     pci_alloc_consistent followed by memset with 0
///
/// This considers some simple cases that are common and easy to validate
/// Note in particular that there are no ...s in the rule, so all of the
/// matched code has to be contiguous
///
/// Blatantly cribbed from: scripts/coccinelle/api/alloc/kzalloc-simple.cocci

@@
type T, T2;
expression x;
expression E1,E2,E3;
statement S;
@@

- x = (T)pci_alloc_consistent(E1,E2,E3);
+ x = pci_zalloc_consistent(E1,E2,E3);
  if ((x==NULL) || ...) S
- memset((T2)x,0,E2);

Re: [PATCH 00/22] Add and use pci_zalloc_consistent

[David Miller]

From: Joe Perches <joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org>
Date: Mon, 23 Jun 2014 06:41:28 -0700

> Adding the helper reduces object code size as well as overall
> source size line count.
> 
> It's also consistent with all the various zalloc mechanisms
> in the kernel.
> 
> Done with a simple cocci script and some typing.

For networking bits:

Acked-by: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
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Re: [PATCH 00/22] Add and use pci_zalloc_consistent

[Julian Calaby]

Hi Joe,

On Tue, Jun 24, 2014 at 5:13 AM, Joe Perches <joe@perches.com> wrote:
> On Mon, 2014-06-23 at 10:25 -0700, Luis R. Rodriguez wrote:
>> On Mon, Jun 23, 2014 at 06:41:28AM -0700, Joe Perches wrote:
>> > Adding the helper reduces object code size as well as overall
>> > source size line count.
>> >
>> > It's also consistent with all the various zalloc mechanisms
>> > in the kernel.
>> >
>> > Done with a simple cocci script and some typing.
>>
>> Awesome, any chance you can paste in the SmPL? Also any chance
>> we can get this added to a make coccicheck so that maintainers
>> moving forward can use that to ensure that no new code is
>> added that uses the old school API?
>
> Not many of these are recent.
>
> Arnd Bergmann reasonably suggested that the pci_alloc_consistent
> api be converted the the more widely used dma_alloc_coherent.
>
> https://lkml.org/lkml/2014/6/23/513
>
>> Shouldn't these drivers just use the normal dma-mapping API now?
>
> and I replied:
>
> https://lkml.org/lkml/2014/6/23/525
>
>> Maybe.  I wouldn't mind.
>> They do seem to have a trivial bit of unnecessary overhead for
>> hwdev == NULL ? NULL : &hwdev->dev
>
> Anyway, here's the little script.
> I'm not sure it's worthwhile to add it though.
>
> $ cat ./scripts/coccinelle/api/alloc/pci_zalloc_consistent.cocci
> ///
> /// Use pci_zalloc_consistent rather than
> ///     pci_alloc_consistent followed by memset with 0
> ///
> /// This considers some simple cases that are common and easy to validate
> /// Note in particular that there are no ...s in the rule, so all of the
> /// matched code has to be contiguous
> ///
> /// Blatantly cribbed from: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
>
> @@
> type T, T2;
> expression x;
> expression E1,E2,E3;
> statement S;
> @@
>
> - x = (T)pci_alloc_consistent(E1,E2,E3);
> + x = pci_zalloc_consistent(E1,E2,E3);
>   if ((x==NULL) || ...) S
> - memset((T2)x,0,E2);

I don't know much about SmPL, but wouldn't having that if statement
there reduce your matches?

Thanks,

-- 
Julian Calaby

Email: julian.calaby@gmail.com
Profile: http://www.google.com/profiles/julian.calaby/
.Plan: http://sites.google.com/site/juliancalaby/

Re: [PATCH 00/22] Add and use pci_zalloc_consistent

[Johannes Berg]

On Tue, 2014-06-24 at 09:27 +1000, Julian Calaby wrote:

> > - x = (T)pci_alloc_consistent(E1,E2,E3);
> > + x = pci_zalloc_consistent(E1,E2,E3);
> >   if ((x==NULL) || ...) S
> > - memset((T2)x,0,E2);
> 
> I don't know much about SmPL, but wouldn't having that if statement
> there reduce your matches?

Code that matched without the if statement would be buggy, since it
wouldn't be checking the pci_zalloc_consistent return value properly.l

johannes

Re: [PATCH 00/22] Add and use pci_zalloc_consistent

[John W. Linville]

On Mon, Jun 23, 2014 at 06:41:28AM -0700, Joe Perches wrote:
> Adding the helper reduces object code size as well as overall
> source size line count.
> 
> It's also consistent with all the various zalloc mechanisms
> in the kernel.
> 
> Done with a simple cocci script and some typing.
> 
> Joe Perches (22):

>   ipw2100: Use pci_zalloc_consistent
>   mwl8k: Use pci_zalloc_consistent
>   rtl818x: Use pci_zalloc_consistent
>   rtlwifi: Use pci_zalloc_consistent

Sure, fine by me.

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