[PATCH] Various cleanups in the code base found with sparse (v1) for v3.7.

[PATCH] Various cleanups in the code base found with sparse (v1) for v3.7.

[Konrad Rzeszutek Wilk]

I've been starting to run sparse to make sure we are not introducing
any potential issues. It does not report any in the Xen code-base but it
does reports a bit of the warnings so these take care of removing them.

Most of the warnings were of the type : <function or value> not declared.

And in some cases they just needed to be converted to 'static' or
the header file included in the C code.

[PATCH 1/6] xen/swiotlb: Remove functions not needed anymore.

[Konrad Rzeszutek Wilk]

Sparse warns us off:
drivers/xen/swiotlb-xen.c:506:1: warning: symbol 'xen_swiotlb_map_sg' was not declared. Should it be static?
drivers/xen/swiotlb-xen.c:534:1: warning: symbol 'xen_swiotlb_unmap_sg' was not declared. Should it be static?

and it looks like we do not need this function at all.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 drivers/xen/swiotlb-xen.c |   16 ----------------
 include/xen/swiotlb-xen.h |    9 ---------
 2 files changed, 0 insertions(+), 25 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 1942a3e..09e25a6 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -502,14 +502,6 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 }
 EXPORT_SYMBOL_GPL(xen_swiotlb_map_sg_attrs);
 
-int
-xen_swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
-		   enum dma_data_direction dir)
-{
-	return xen_swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL_GPL(xen_swiotlb_map_sg);
-
 /*
  * Unmap a set of streaming mode DMA translations.  Again, cpu read rules
  * concerning calls here are the same as for swiotlb_unmap_page() above.
@@ -530,14 +522,6 @@ xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 }
 EXPORT_SYMBOL_GPL(xen_swiotlb_unmap_sg_attrs);
 
-void
-xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
-		     enum dma_data_direction dir)
-{
-	return xen_swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL_GPL(xen_swiotlb_unmap_sg);
-
 /*
  * Make physical memory consistent for a set of streaming mode DMA translations
  * after a transfer.
diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h
index d38d984..d8cba6f 100644
--- a/include/xen/swiotlb-xen.h
+++ b/include/xen/swiotlb-xen.h
@@ -24,15 +24,6 @@ extern dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
 extern void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
 				   size_t size, enum dma_data_direction dir,
 				   struct dma_attrs *attrs);
-/*
-extern int
-xen_swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
-		   enum dma_data_direction dir);
-
-extern void
-xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
-		     enum dma_data_direction dir);
-*/
 extern int
 xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 			 int nelems, enum dma_data_direction dir,
-- 
1.7.7.6

[PATCH 2/6] xen/swiotlb: Fix compile warnings when using plain integer instead of NULL pointer.

[Konrad Rzeszutek Wilk]

arch/x86/xen/pci-swiotlb-xen.c:96:1: warning: Using plain integer as NULL pointer
arch/x86/xen/pci-swiotlb-xen.c:96:1: warning: Using plain integer as NULL pointer

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/pci-swiotlb-xen.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
index 031d8bc..1667602 100644
--- a/arch/x86/xen/pci-swiotlb-xen.c
+++ b/arch/x86/xen/pci-swiotlb-xen.c
@@ -92,6 +92,6 @@ int pci_xen_swiotlb_init_late(void)
 EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
 
 IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
-		  0,
+		  NULL,
 		  pci_xen_swiotlb_init,
-		  0);
+		  NULL);
-- 
1.7.7.6

[PATCH 3/6] xen/apic/xenbus/swiotlb/pcifront/grant/tmem: Make functions or variables static.

[Konrad Rzeszutek Wilk]

There is no need for those functions/variables to be visible. Make them
static and also fix the compile warnings of this sort:

drivers/xen/<some file>.c: warning: symbol '<blah>' was not declared. Should it be static?

Some of them just require including the header file that
declares the functions.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/apic.c                     |    3 ++-
 arch/x86/xen/enlighten.c                |    2 ++
 arch/x86/xen/pci-swiotlb-xen.c          |    2 ++
 arch/x86/xen/platform-pci-unplug.c      |    1 +
 drivers/pci/xen-pcifront.c              |    2 +-
 drivers/xen/gntdev.c                    |    2 +-
 drivers/xen/grant-table.c               |   13 ++++++-------
 drivers/xen/swiotlb-xen.c               |    2 +-
 drivers/xen/tmem.c                      |    1 +
 drivers/xen/xenbus/xenbus_dev_backend.c |    2 +-
 drivers/xen/xenbus/xenbus_probe.c       |    4 ++--
 11 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
index ec57bd3..7005ced 100644
--- a/arch/x86/xen/apic.c
+++ b/arch/x86/xen/apic.c
@@ -6,8 +6,9 @@
 
 #include <xen/xen.h>
 #include <xen/interface/physdev.h>
+#include "xen-ops.h"
 
-unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
+static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
 {
 	struct physdev_apic apic_op;
 	int ret;
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index acf906c..2c36e6e 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -81,6 +81,8 @@
 #include "smp.h"
 #include "multicalls.h"
 
+#include <xen/events.h>
+
 EXPORT_SYMBOL_GPL(hypercall_page);
 
 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
index 1667602..db4db14 100644
--- a/arch/x86/xen/pci-swiotlb-xen.c
+++ b/arch/x86/xen/pci-swiotlb-xen.c
@@ -13,6 +13,8 @@
 #include <asm/dma.h>
 #endif
 #include <linux/export.h>
+
+#include <asm/xen/swiotlb-xen.h>
 int xen_swiotlb __read_mostly;
 
 static struct dma_map_ops xen_swiotlb_dma_ops = {
diff --git a/arch/x86/xen/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c
index ffcf261..0a78524 100644
--- a/arch/x86/xen/platform-pci-unplug.c
+++ b/arch/x86/xen/platform-pci-unplug.c
@@ -24,6 +24,7 @@
 #include <linux/module.h>
 
 #include <xen/platform_pci.h>
+#include "xen-ops.h"
 
 #define XEN_PLATFORM_ERR_MAGIC -1
 #define XEN_PLATFORM_ERR_PROTOCOL -2
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index ca92801..ebd1ddb 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -237,7 +237,7 @@ static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
 	return errno_to_pcibios_err(do_pci_op(pdev, &op));
 }
 
-struct pci_ops pcifront_bus_ops = {
+static struct pci_ops pcifront_bus_ops = {
 	.read = pcifront_bus_read,
 	.write = pcifront_bus_write,
 };
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 1ffd03b..163b7e9 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -445,7 +445,7 @@ static void mn_release(struct mmu_notifier *mn,
 	spin_unlock(&priv->lock);
 }
 
-struct mmu_notifier_ops gntdev_mmu_ops = {
+static struct mmu_notifier_ops gntdev_mmu_ops = {
 	.release                = mn_release,
 	.invalidate_page        = mn_invl_page,
 	.invalidate_range_start = mn_invl_range_start,
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 0bfc1ef..4061943 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -285,10 +285,9 @@ int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
 }
 EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
 
-void gnttab_update_subpage_entry_v2(grant_ref_t ref, domid_t domid,
-				    unsigned long frame, int flags,
-				    unsigned page_off,
-				    unsigned length)
+static void gnttab_update_subpage_entry_v2(grant_ref_t ref, domid_t domid,
+					   unsigned long frame, int flags,
+					   unsigned page_off, unsigned length)
 {
 	gnttab_shared.v2[ref].sub_page.frame = frame;
 	gnttab_shared.v2[ref].sub_page.page_off = page_off;
@@ -345,9 +344,9 @@ bool gnttab_subpage_grants_available(void)
 }
 EXPORT_SYMBOL_GPL(gnttab_subpage_grants_available);
 
-void gnttab_update_trans_entry_v2(grant_ref_t ref, domid_t domid,
-				  int flags, domid_t trans_domid,
-				  grant_ref_t trans_gref)
+static void gnttab_update_trans_entry_v2(grant_ref_t ref, domid_t domid,
+					 int flags, domid_t trans_domid,
+					 grant_ref_t trans_gref)
 {
 	gnttab_shared.v2[ref].transitive.trans_domid = trans_domid;
 	gnttab_shared.v2[ref].transitive.gref = trans_gref;
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 09e25a6..307a908 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -52,7 +52,7 @@ static unsigned long xen_io_tlb_nslabs;
  * Quick lookup value of the bus address of the IOTLB.
  */
 
-u64 start_dma_addr;
+static u64 start_dma_addr;
 
 static dma_addr_t xen_phys_to_bus(phys_addr_t paddr)
 {
diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index 89f264c..144564e 100644
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -21,6 +21,7 @@
 #include <asm/xen/hypercall.h>
 #include <asm/xen/page.h>
 #include <asm/xen/hypervisor.h>
+#include <xen/tmem.h>
 
 #define TMEM_CONTROL               0
 #define TMEM_NEW_POOL              1
diff --git a/drivers/xen/xenbus/xenbus_dev_backend.c b/drivers/xen/xenbus/xenbus_dev_backend.c
index be738c4..d730008 100644
--- a/drivers/xen/xenbus/xenbus_dev_backend.c
+++ b/drivers/xen/xenbus/xenbus_dev_backend.c
@@ -107,7 +107,7 @@ static int xenbus_backend_mmap(struct file *file, struct vm_area_struct *vma)
 	return 0;
 }
 
-const struct file_operations xenbus_backend_fops = {
+static const struct file_operations xenbus_backend_fops = {
 	.open = xenbus_backend_open,
 	.mmap = xenbus_backend_mmap,
 	.unlocked_ioctl = xenbus_backend_ioctl,
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index b793723..91d3d654 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -324,8 +324,8 @@ static int cmp_dev(struct device *dev, void *data)
 	return 0;
 }
 
-struct xenbus_device *xenbus_device_find(const char *nodename,
-					 struct bus_type *bus)
+static struct xenbus_device *xenbus_device_find(const char *nodename,
+						struct bus_type *bus)
 {
 	struct xb_find_info info = { .dev = NULL, .nodename = nodename };
 
-- 
1.7.7.6

[PATCH 4/6] xen/mmu: Fix compile warnings.

[Konrad Rzeszutek Wilk]

linux/arch/x86/xen/mmu.c:1788:14: warning: comparison between pointer and integer [enabled by default]

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/xen/mmu.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 90d31a2..4911354 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1786,11 +1786,11 @@ void __init xen_setup_machphys_mapping(void)
 {
 	struct xen_machphys_mapping mapping;
 
-	if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
+	if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, (void *)&mapping) == 0) {
 		machine_to_phys_mapping = (unsigned long *)mapping.v_start;
 		machine_to_phys_nr = mapping.max_mfn + 1;
 	} else {
-		machine_to_phys_nr = MACH2PHYS_NR_ENTRIES;
+		machine_to_phys_nr = (unsigned long)MACH2PHYS_NR_ENTRIES;
 	}
 #ifdef CONFIG_X86_32
 	WARN_ON((machine_to_phys_mapping + (machine_to_phys_nr - 1))
-- 
1.7.7.6

[PATCH 5/6] xen/blkback: Fix compile warning

[Konrad Rzeszutek Wilk]

drivers/block/xen-blkback/xenbus.c:260:5: warning: symbol 'xenvbd_sysfs_addif' was not declared. Should it be static?
drivers/block/xen-blkback/xenbus.c:284:6: warning: symbol 'xenvbd_sysfs_delif' was not declared. Should it be static?

CC: JEns Axboe <axboe@kernel.dk>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 drivers/block/xen-blkback/xenbus.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 4f66171..d0fed55 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -196,7 +196,7 @@ static void xen_blkif_disconnect(struct xen_blkif *blkif)
 	}
 }
 
-void xen_blkif_free(struct xen_blkif *blkif)
+static void xen_blkif_free(struct xen_blkif *blkif)
 {
 	if (!atomic_dec_and_test(&blkif->refcnt))
 		BUG();
@@ -257,7 +257,7 @@ static struct attribute_group xen_vbdstat_group = {
 VBD_SHOW(physical_device, "%x:%x\n", be->major, be->minor);
 VBD_SHOW(mode, "%s\n", be->mode);
 
-int xenvbd_sysfs_addif(struct xenbus_device *dev)
+static int xenvbd_sysfs_addif(struct xenbus_device *dev)
 {
 	int error;
 
@@ -281,7 +281,7 @@ fail1:	device_remove_file(&dev->dev, &dev_attr_physical_device);
 	return error;
 }
 
-void xenvbd_sysfs_delif(struct xenbus_device *dev)
+static void xenvbd_sysfs_delif(struct xenbus_device *dev)
 {
 	sysfs_remove_group(&dev->dev.kobj, &xen_vbdstat_group);
 	device_remove_file(&dev->dev, &dev_attr_mode);
-- 
1.7.7.6

[PATCH 6/6] iommu: Fixes duplicate const warning.

[Konrad Rzeszutek Wilk]

arch/x86/kernel/pci-dma.c:275:1: warning: duplicate const
arch/x86/kernel/pci-swiotlb.c:68:1: warning: duplicate const
arch/x86/kernel/pci-swiotlb.c:86:1: warning: duplicate const
arch/x86/kernel/amd_gart_64.c:899:1: warning: duplicate const
arch/x86/kernel/pci-calgary_64.c:1600:1: warning: duplicate const
arch/x86/xen/pci-swiotlb-xen.c:96:1: warning: duplicate const
drivers/iommu/amd_iommu_init.c:1831:1: warning: duplicate const
drivers/iommu/dmar.c:1350:1: warning: duplicate const

when using smatch.

CC: x86@kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/include/asm/iommu_table.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/iommu_table.h b/arch/x86/include/asm/iommu_table.h
index f229b13..bbf8fb2 100644
--- a/arch/x86/include/asm/iommu_table.h
+++ b/arch/x86/include/asm/iommu_table.h
@@ -48,7 +48,7 @@ struct iommu_table_entry {
 
 
 #define __IOMMU_INIT(_detect, _depend, _early_init, _late_init, _finish)\
-	static const struct iommu_table_entry const			\
+	static const struct iommu_table_entry				\
 		__iommu_entry_##_detect __used				\
 	__attribute__ ((unused, __section__(".iommu_table"),		\
 			aligned((sizeof(void *)))))	\
-- 
1.7.7.6

Re: [Xen-devel] [PATCH 4/6] xen/mmu: Fix compile warnings.

[Ian Campbell]

On Thu, 2012-08-16 at 17:12 +0100, Konrad Rzeszutek Wilk wrote:
> linux/arch/x86/xen/mmu.c:1788:14: warning: comparison between pointer and integer [enabled by default]
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  arch/x86/xen/mmu.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
> index 90d31a2..4911354 100644
> --- a/arch/x86/xen/mmu.c
> +++ b/arch/x86/xen/mmu.c
> @@ -1786,11 +1786,11 @@ void __init xen_setup_machphys_mapping(void)
>  {
>  	struct xen_machphys_mapping mapping;
>  
> -	if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
> +	if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, (void *)&mapping) == 0) {

This changes seems to be unnecessary and not related to the commit
message.

>  		machine_to_phys_mapping = (unsigned long *)mapping.v_start;
>  		machine_to_phys_nr = mapping.max_mfn + 1;
>  	} else {
> -		machine_to_phys_nr = MACH2PHYS_NR_ENTRIES;
> +		machine_to_phys_nr = (unsigned long)MACH2PHYS_NR_ENTRIES;

I must be missing something. Given:
        #define MACH2PHYS_VIRT_START  mk_unsigned_long(__MACH2PHYS_VIRT_START)
        #define MACH2PHYS_VIRT_END    mk_unsigned_long(__MACH2PHYS_VIRT_END)
        #define MACH2PHYS_NR_ENTRIES  ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>__MACH2PHYS_SHIFT)
How is MACH2PHYS_NR_ENTRIES not already unsigned long? Or at the very
least how is it not an integer type of some sort, it certainly doesn't
look like it can be a pointer (as suggested by the commit message) to
me.


>  	}
>  #ifdef CONFIG_X86_32
>  	WARN_ON((machine_to_phys_mapping + (machine_to_phys_nr - 1))