RE: [RFC PATCH 11/11] x86/MSI: Refactor x86 MSI code
From: Bharat.Bhushan@xxxxxxxxxxxxx
Date: Wed Aug 20 2014 - 02:20:42 EST
> -----Original Message-----
> From: linux-pci-owner@xxxxxxxxxxxxxxx [mailto:linux-pci-owner@xxxxxxxxxxxxxxx]
> On Behalf Of Yijing Wang
> Sent: Saturday, July 26, 2014 8:39 AM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Cc: Xinwei Hu; Wuyun; Bjorn Helgaas; linux-pci@xxxxxxxxxxxxxxx;
> Paul.Mundt@xxxxxxxxxx; James E.J. Bottomley; Marc Zyngier; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; Russell King; linux-arch@xxxxxxxxxxxxxxx; Basu
> Arnab-B45036; virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx; Hanjun Guo; Yijing Wang
> Subject: [RFC PATCH 11/11] x86/MSI: Refactor x86 MSI code
Please provide description about what this refactoring is? Also does other architecture also need similar refactoring ?
Thanks
-Bharat
>
> Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
> ---
> arch/x86/include/asm/io_apic.h | 2 +-
> arch/x86/include/asm/irq_remapping.h | 4 +-
> arch/x86/include/asm/pci.h | 6 ++--
> arch/x86/include/asm/x86_init.h | 10 +++---
> arch/x86/kernel/apic/io_apic.c | 23 +++++++--------
> arch/x86/kernel/x86_init.c | 12 ++++----
> drivers/iommu/amd_iommu.c | 16 ++++++----
> drivers/iommu/intel_irq_remapping.c | 9 ++++--
> drivers/iommu/irq_remapping.c | 51 ++++++++++++++++-----------------
> drivers/iommu/irq_remapping.h | 6 ++--
> drivers/msi/msi.c | 3 +-
> 11 files changed, 72 insertions(+), 70 deletions(-)
>
> diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
> index 90f97b4..692a90f 100644
> --- a/arch/x86/include/asm/io_apic.h
> +++ b/arch/x86/include/asm/io_apic.h
> @@ -158,7 +158,7 @@ extern int native_setup_ioapic_entry(int, struct
> IO_APIC_route_entry *,
> struct io_apic_irq_attr *);
> extern void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg);
>
> -extern void native_compose_msi_msg(struct pci_dev *pdev,
> +extern void native_compose_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id);
> extern void native_eoi_ioapic_pin(int apic, int pin, int vector);
> diff --git a/arch/x86/include/asm/irq_remapping.h
> b/arch/x86/include/asm/irq_remapping.h
> index b7747c4..a10003d 100644
> --- a/arch/x86/include/asm/irq_remapping.h
> +++ b/arch/x86/include/asm/irq_remapping.h
> @@ -47,7 +47,7 @@ extern int setup_ioapic_remapped_entry(int irq,
> int vector,
> struct io_apic_irq_attr *attr);
> extern void free_remapped_irq(int irq);
> -extern void compose_remapped_msi_msg(struct pci_dev *pdev,
> +extern void compose_remapped_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id);
> extern int setup_hpet_msi_remapped(unsigned int irq, unsigned int id);
> @@ -77,7 +77,7 @@ static inline int setup_ioapic_remapped_entry(int irq,
> return -ENODEV;
> }
> static inline void free_remapped_irq(int irq) { }
> -static inline void compose_remapped_msi_msg(struct pci_dev *pdev,
> +static inline void compose_remapped_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id)
> {
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 0892ea0..04c9ef6 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -96,10 +96,10 @@ extern void pci_iommu_alloc(void);
> #ifdef CONFIG_PCI_MSI
> /* implemented in arch/x86/kernel/apic/io_apic. */
> struct msi_desc;
> -int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
> +int native_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type);
> void native_teardown_msi_irq(unsigned int irq);
> -void native_restore_msi_irqs(struct pci_dev *dev);
> -int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
> +void native_restore_msi_irqs(struct msi_irqs *msi);
> +int setup_msi_irq(struct msi_irqs *msi, struct msi_desc *msidesc,
> unsigned int irq_base, unsigned int irq_offset);
> #else
> #define native_setup_msi_irqs NULL
> diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
> index e45e4da..8e42f17 100644
> --- a/arch/x86/include/asm/x86_init.h
> +++ b/arch/x86/include/asm/x86_init.h
> @@ -170,18 +170,18 @@ struct x86_platform_ops {
> void (*apic_post_init)(void);
> };
>
> -struct pci_dev;
> +struct msi_irqs;
> struct msi_msg;
> struct msi_desc;
>
> struct x86_msi_ops {
> - int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
> - void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
> + int (*setup_msi_irqs)(struct msi_irqs *msi, int nvec, int type);
> + void (*compose_msi_msg)(struct msi_irqs *msi, unsigned int irq,
> unsigned int dest, struct msi_msg *msg,
> u8 hpet_id);
> void (*teardown_msi_irq)(unsigned int irq);
> - void (*teardown_msi_irqs)(struct pci_dev *dev);
> - void (*restore_msi_irqs)(struct pci_dev *dev);
> + void (*teardown_msi_irqs)(struct msi_irqs *msi);
> + void (*restore_msi_irqs)(struct msi_irqs *msi);
> int (*setup_hpet_msi)(unsigned int irq, unsigned int id);
> u32 (*msi_mask_irq)(struct msi_desc *desc, u32 mask, u32 flag);
> u32 (*msix_mask_irq)(struct msi_desc *desc, u32 flag);
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index b833042..3cb4a6a 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -2939,7 +2939,7 @@ void arch_teardown_hwirq(unsigned int irq)
> /*
> * MSI message composition
> */
> -void native_compose_msi_msg(struct pci_dev *pdev,
> +void native_compose_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id)
> {
> @@ -2970,7 +2970,7 @@ void native_compose_msi_msg(struct pci_dev *pdev,
> }
>
> #ifdef CONFIG_PCI_MSI
> -static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
> +static int msi_compose_msg(struct msi_irqs *msi, unsigned int irq,
> struct msi_msg *msg, u8 hpet_id)
> {
> struct irq_cfg *cfg;
> @@ -2990,7 +2990,7 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned
> int irq,
> if (err)
> return err;
>
> - x86_msi.compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> + x86_msi.compose_msi_msg(msi, irq, dest, msg, hpet_id);
>
> return 0;
> }
> @@ -3032,15 +3032,16 @@ static struct irq_chip msi_chip = {
> .irq_retrigger = ioapic_retrigger_irq,
> };
>
> -int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
> +int setup_msi_irq(struct msi_irqs *msi, struct msi_desc *msidesc,
> unsigned int irq_base, unsigned int irq_offset)
> {
> struct irq_chip *chip = &msi_chip;
> struct msi_msg msg;
> unsigned int irq = irq_base + irq_offset;
> int ret;
> + struct pci_dev *dev = msi->data;
>
> - ret = msi_compose_msg(dev, irq, &msg, -1);
> + ret = msi_compose_msg(msi, irq, &msg, -1);
> if (ret < 0)
> return ret;
>
> @@ -3062,24 +3063,22 @@ int setup_msi_irq(struct pci_dev *dev, struct msi_desc
> *msidesc,
> return 0;
> }
>
> -int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +int native_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type)
> {
> struct msi_desc *msidesc;
> unsigned int irq;
> - int node, ret;
> + int ret;
>
> /* Multiple MSI vectors only supported with interrupt remapping */
> if (type == MSI_TYPE && nvec > 1)
> return 1;
>
> - node = dev_to_node(&dev->dev);
> -
> - list_for_each_entry(msidesc, &dev->msi_list, list) {
> - irq = irq_alloc_hwirq(node);
> + list_for_each_entry(msidesc, &msi->msi_list, list) {
> + irq = irq_alloc_hwirq(msi->node);
> if (!irq)
> return -ENOSPC;
>
> - ret = setup_msi_irq(dev, msidesc, irq, 0);
> + ret = setup_msi_irq(msi, msidesc, irq, 0);
> if (ret < 0) {
> irq_free_hwirq(irq);
> return ret;
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index e48b674..a277faf 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -121,14 +121,14 @@ struct x86_msi_ops x86_msi = {
> };
>
> /* MSI arch specific hooks */
> -int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +int arch_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type)
> {
> - return x86_msi.setup_msi_irqs(dev, nvec, type);
> + return x86_msi.setup_msi_irqs(msi, nvec, type);
> }
>
> -void arch_teardown_msi_irqs(struct pci_dev *dev)
> +void arch_teardown_msi_irqs(struct msi_irqs *msi)
> {
> - x86_msi.teardown_msi_irqs(dev);
> + x86_msi.teardown_msi_irqs(msi);
> }
>
> void arch_teardown_msi_irq(unsigned int irq)
> @@ -136,9 +136,9 @@ void arch_teardown_msi_irq(unsigned int irq)
> x86_msi.teardown_msi_irq(irq);
> }
>
> -void arch_restore_msi_irqs(struct pci_dev *dev)
> +void arch_restore_msi_irqs(struct msi_irqs *msi)
> {
> - x86_msi.restore_msi_irqs(dev);
> + x86_msi.restore_msi_irqs(msi);
> }
> u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> {
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 4aec6a2..0e45cb7 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -4237,7 +4237,7 @@ static int free_irq(int irq)
> return 0;
> }
>
> -static void compose_msi_msg(struct pci_dev *pdev,
> +static void compose_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id)
> {
> @@ -4265,33 +4265,35 @@ static void compose_msi_msg(struct pci_dev *pdev,
> msg->data = irte_info->index;
> }
>
> -static int msi_alloc_irq(struct pci_dev *pdev, int irq, int nvec)
> +static int msi_alloc_irq(struct msi_irqs *msi, int irq, int nvec)
> {
> struct irq_cfg *cfg;
> int index;
> u16 devid;
> + struct pci_dev *dev = msi->data;
>
> - if (!pdev)
> + if (!dev)
> return -EINVAL;
>
> cfg = irq_get_chip_data(irq);
> if (!cfg)
> return -EINVAL;
>
> - devid = get_device_id(&pdev->dev);
> + devid = get_device_id(&dev->dev);
> index = alloc_irq_index(cfg, devid, nvec);
>
> return index < 0 ? MAX_IRQS_PER_TABLE : index;
> }
>
> -static int msi_setup_irq(struct pci_dev *pdev, unsigned int irq,
> +static int msi_setup_irq(struct msi_irqs *msi, unsigned int irq,
> int index, int offset)
> {
> struct irq_2_irte *irte_info;
> struct irq_cfg *cfg;
> u16 devid;
> + struct pci_dev *dev = msi->data;
>
> - if (!pdev)
> + if (!dev)
> return -EINVAL;
>
> cfg = irq_get_chip_data(irq);
> @@ -4301,7 +4303,7 @@ static int msi_setup_irq(struct pci_dev *pdev, unsigned
> int irq,
> if (index >= MAX_IRQS_PER_TABLE)
> return 0;
>
> - devid = get_device_id(&pdev->dev);
> + devid = get_device_id(&dev->dev);
> irte_info = &cfg->irq_2_irte;
>
> cfg->remapped = 1;
> diff --git a/drivers/iommu/intel_irq_remapping.c
> b/drivers/iommu/intel_irq_remapping.c
> index 9b17489..d6bde63 100644
> --- a/drivers/iommu/intel_irq_remapping.c
> +++ b/drivers/iommu/intel_irq_remapping.c
> @@ -1027,7 +1027,7 @@ intel_ioapic_set_affinity(struct irq_data *data, const
> struct cpumask *mask,
> return 0;
> }
>
> -static void intel_compose_msi_msg(struct pci_dev *pdev,
> +static void intel_compose_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id)
> {
> @@ -1035,6 +1035,7 @@ static void intel_compose_msi_msg(struct pci_dev *pdev,
> struct irte irte;
> u16 sub_handle = 0;
> int ir_index;
> + struct pci_dev *pdev = msi->data;
>
> cfg = irq_get_chip_data(irq);
>
> @@ -1064,10 +1065,11 @@ static void intel_compose_msi_msg(struct pci_dev *pdev,
> * and allocate 'nvec' consecutive interrupt-remapping table entries
> * in it.
> */
> -static int intel_msi_alloc_irq(struct pci_dev *dev, int irq, int nvec)
> +static int intel_msi_alloc_irq(struct msi_irqs *msi, int irq, int nvec)
> {
> struct intel_iommu *iommu;
> int index;
> + struct pci_dev *dev = msi->data;
>
> down_read(&dmar_global_lock);
> iommu = map_dev_to_ir(dev);
> @@ -1089,11 +1091,12 @@ static int intel_msi_alloc_irq(struct pci_dev *dev, int
> irq, int nvec)
> return index;
> }
>
> -static int intel_msi_setup_irq(struct pci_dev *pdev, unsigned int irq,
> +static int intel_msi_setup_irq(struct msi_irqs *msi, unsigned int irq,
> int index, int sub_handle)
> {
> struct intel_iommu *iommu;
> int ret = -ENOENT;
> + struct pci_dev *pdev = msi->data;
>
> down_read(&dmar_global_lock);
> iommu = map_dev_to_ir(pdev);
> diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
> index a3b1805..1fe14e5 100644
> --- a/drivers/iommu/irq_remapping.c
> +++ b/drivers/iommu/irq_remapping.c
> @@ -24,8 +24,8 @@ int no_x2apic_optout;
>
> static struct irq_remap_ops *remap_ops;
>
> -static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
> -static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
> +static int msi_alloc_remapped_irq(struct msi_irqs *msi, int irq, int nvec);
> +static int msi_setup_remapped_irq(struct msi_irqs *msi, unsigned int irq,
> int index, int sub_handle);
> static int set_remapped_irq_affinity(struct irq_data *data,
> const struct cpumask *mask,
> @@ -49,19 +49,19 @@ static void irq_remapping_disable_io_apic(void)
> disconnect_bsp_APIC(0);
> }
>
> -static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
> +static int do_setup_msi_irqs(struct msi_irqs *msi, int nvec)
> {
> int ret, sub_handle, nvec_pow2, index = 0;
> unsigned int irq;
> struct msi_desc *msidesc;
>
> - WARN_ON(!list_is_singular(&dev->msi_list));
> - msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
> + WARN_ON(!list_is_singular(&msi->msi_list));
> + msidesc = list_entry(msi->msi_list.next, struct msi_desc, list);
> WARN_ON(msidesc->irq);
> WARN_ON(msidesc->msi_attrib.multiple);
> WARN_ON(msidesc->nvec_used);
>
> - irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev));
> + irq = irq_alloc_hwirqs(nvec, msi->node);
> if (irq == 0)
> return -ENOSPC;
>
> @@ -70,18 +70,18 @@ static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
> msidesc->msi_attrib.multiple = ilog2(nvec_pow2);
> for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
> if (!sub_handle) {
> - index = msi_alloc_remapped_irq(dev, irq, nvec_pow2);
> + index = msi_alloc_remapped_irq(msi, irq, nvec_pow2);
> if (index < 0) {
> ret = index;
> goto error;
> }
> } else {
> - ret = msi_setup_remapped_irq(dev, irq + sub_handle,
> + ret = msi_setup_remapped_irq(msi, irq + sub_handle,
> index, sub_handle);
> if (ret < 0)
> goto error;
> }
> - ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
> + ret = setup_msi_irq(msi, msidesc, irq, sub_handle);
> if (ret < 0)
> goto error;
> }
> @@ -101,30 +101,29 @@ error:
> return ret;
> }
>
> -static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
> +static int do_setup_msix_irqs(struct msi_irqs *msi, int nvec)
> {
> int node, ret, sub_handle, index = 0;
> struct msi_desc *msidesc;
> unsigned int irq;
>
> - node = dev_to_node(&dev->dev);
> sub_handle = 0;
>
> - list_for_each_entry(msidesc, &dev->msi_list, list) {
> + list_for_each_entry(msidesc, &msi->msi_list, list) {
>
> - irq = irq_alloc_hwirq(node);
> + irq = irq_alloc_hwirq(msi->node);
> if (irq == 0)
> return -1;
>
> if (sub_handle == 0)
> - ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
> + ret = index = msi_alloc_remapped_irq(msi, irq, nvec);
> else
> - ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
> + ret = msi_setup_remapped_irq(msi, irq, index, sub_handle);
>
> if (ret < 0)
> goto error;
>
> - ret = setup_msi_irq(dev, msidesc, irq, 0);
> + ret = setup_msi_irq(msi, msidesc, irq, 0);
> if (ret < 0)
> goto error;
>
> @@ -139,13 +138,13 @@ error:
> return ret;
> }
>
> -static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
> +static int irq_remapping_setup_msi_irqs(struct msi_irqs *msi,
> int nvec, int type)
> {
> if (type == MSI_TYPE)
> - return do_setup_msi_irqs(dev, nvec);
> + return do_setup_msi_irqs(msi, nvec);
> else
> - return do_setup_msix_irqs(dev, nvec);
> + return do_setup_msix_irqs(msi, nvec);
> }
>
> static void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
> @@ -314,33 +313,33 @@ void free_remapped_irq(int irq)
> remap_ops->free_irq(irq);
> }
>
> -void compose_remapped_msi_msg(struct pci_dev *pdev,
> +void compose_remapped_msi_msg(struct msi_irqs *msi,
> unsigned int irq, unsigned int dest,
> struct msi_msg *msg, u8 hpet_id)
> {
> struct irq_cfg *cfg = irq_get_chip_data(irq);
>
> if (!irq_remapped(cfg))
> - native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> + native_compose_msi_msg(msi, irq, dest, msg, hpet_id);
> else if (remap_ops && remap_ops->compose_msi_msg)
> - remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> + remap_ops->compose_msi_msg(msi, irq, dest, msg, hpet_id);
> }
>
> -static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
> +static int msi_alloc_remapped_irq(struct msi_irqs *msi, int irq, int nvec)
> {
> if (!remap_ops || !remap_ops->msi_alloc_irq)
> return -ENODEV;
>
> - return remap_ops->msi_alloc_irq(pdev, irq, nvec);
> + return remap_ops->msi_alloc_irq(msi, irq, nvec);
> }
>
> -static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
> +static int msi_setup_remapped_irq(struct msi_irqs *msi, unsigned int irq,
> int index, int sub_handle)
> {
> if (!remap_ops || !remap_ops->msi_setup_irq)
> return -ENODEV;
>
> - return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
> + return remap_ops->msi_setup_irq(msi, irq, index, sub_handle);
> }
>
> int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
> diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
> index 90c4dae..59c4cfb 100644
> --- a/drivers/iommu/irq_remapping.h
> +++ b/drivers/iommu/irq_remapping.h
> @@ -69,15 +69,15 @@ struct irq_remap_ops {
> int (*free_irq)(int);
>
> /* Create MSI msg to use for interrupt remapping */
> - void (*compose_msi_msg)(struct pci_dev *,
> + void (*compose_msi_msg)(struct msi_irqs *,
> unsigned int, unsigned int,
> struct msi_msg *, u8);
>
> /* Allocate remapping resources for MSI */
> - int (*msi_alloc_irq)(struct pci_dev *, int, int);
> + int (*msi_alloc_irq)(struct msi_irqs *, int, int);
>
> /* Setup the remapped MSI irq */
> - int (*msi_setup_irq)(struct pci_dev *, unsigned int, int, int);
> + int (*msi_setup_irq)(struct msi_irqs *, unsigned int, int, int);
>
> /* Setup interrupt remapping for an HPET MSI */
> int (*setup_hpet_msi)(unsigned int, unsigned int);
> diff --git a/drivers/msi/msi.c b/drivers/msi/msi.c
> index 3fbd539..8462c6c 100644
> --- a/drivers/msi/msi.c
> +++ b/drivers/msi/msi.c
> @@ -510,9 +510,8 @@ int msix_capability_init(struct msi_irqs *msi, void __iomem
> *base,
>
> /* Set MSI-X enabled bits and unmask the function */
> msi_set_intx(msi, 0);
> - msi->msix_enabled = 1;
> -
> msi_set_enable(msi, 1, MSIX_TYPE);
> + msi->msix_enabled = 1;
>
> return 0;
>
> --
> 1.7.1
>
> --
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