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vme: fake: fix build for 64-bit dma_addr_t

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casting between dma_addr_t and a pointer is generally tricky,
as they might not be the same size and almost never point into
the same address space. With 32-bit ARM systems and LPAE, we
get this warning for the vme_fake driver that stores a pointer
in a dma_addr_t variable:

drivers/vme/bridges/vme_fake.c: In function 'fake_slave_set':
drivers/vme/bridges/vme_fake.c:204:29: error: assignment makes pointer from integer without a cast [-Werror=int-conversion]

To make this clearer while fixing the warning, I'm adding
a set of helper functions for the type conversion.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Martyn Welch <martyn@welchs.me.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2016-09-06 14:59:41 +02:00 committed by Greg Kroah-Hartman
parent 0b3191d4ea
commit 4b7b948b1f
1 changed files with 18 additions and 8 deletions
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26
drivers/vme/bridges/vme_fake.c
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@ -48,7 +48,7 @@ struct fake_slave_window {
int enabled;
unsigned long long vme_base;
unsigned long long size;
dma_addr_t buf_base;
void *buf_base;
u32 aspace;
u32 cycle;
};
@ -114,6 +114,16 @@ static void fake_irq_set(struct vme_bridge *fake_bridge, int level,
/* Nothing to do */
}
static void *fake_pci_to_ptr(dma_addr_t addr)
{
return (void *)(uintptr_t)addr;
}
static dma_addr_t fake_ptr_to_pci(void *addr)
{
return (dma_addr_t)(uintptr_t)addr;
}
/*
* Generate a VME bus interrupt at the requested level & vector. Wait for
* interrupt to be acked.
@ -202,7 +212,7 @@ static int fake_slave_set(struct vme_slave_resource *image, int enabled,
bridge->slaves[i].enabled = enabled;
bridge->slaves[i].vme_base = vme_base;
bridge->slaves[i].size = size;
bridge->slaves[i].buf_base = buf_base;
bridge->slaves[i].buf_base = fake_pci_to_ptr(buf_base);
bridge->slaves[i].aspace = aspace;
bridge->slaves[i].cycle = cycle;
@ -230,7 +240,7 @@ static int fake_slave_get(struct vme_slave_resource *image, int *enabled,
*enabled = bridge->slaves[i].enabled;
*vme_base = bridge->slaves[i].vme_base;
*size = bridge->slaves[i].size;
*buf_base = bridge->slaves[i].buf_base;
*buf_base = fake_ptr_to_pci(bridge->slaves[i].buf_base);
*aspace = bridge->slaves[i].aspace;
*cycle = bridge->slaves[i].cycle;
@ -431,7 +441,7 @@ static u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr,
if ((addr >= start) && (addr < end)) {
offset = addr - bridge->slaves[i].vme_base;
loc = (u8 *)((void *)bridge->slaves[i].buf_base + offset);
loc = (u8 *)(bridge->slaves[i].buf_base + offset);
retval = *loc;
break;
@ -463,7 +473,7 @@ static u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr,
if ((addr >= start) && ((addr + 1) < end)) {
offset = addr - bridge->slaves[i].vme_base;
loc = (u16 *)((void *)bridge->slaves[i].buf_base + offset);
loc = (u16 *)(bridge->slaves[i].buf_base + offset);
retval = *loc;
break;
@ -495,7 +505,7 @@ static u32 fake_vmeread32(struct fake_driver *bridge, unsigned long long addr,
if ((addr >= start) && ((addr + 3) < end)) {
offset = addr - bridge->slaves[i].vme_base;
loc = (u32 *)((void *)bridge->slaves[i].buf_base + offset);
loc = (u32 *)(bridge->slaves[i].buf_base + offset);
retval = *loc;
break;
@ -997,7 +1007,7 @@ static void *fake_alloc_consistent(struct device *parent, size_t size,
void *alloc = kmalloc(size, GFP_KERNEL);
if (alloc != NULL)
*dma = (dma_addr_t)(unsigned long)alloc;
*dma = fake_ptr_to_pci(alloc);
return alloc;
}
@ -1031,7 +1041,7 @@ static int fake_crcsr_init(struct vme_bridge *fake_bridge)
/* Allocate mem for CR/CSR image */
bridge->crcsr_kernel = kzalloc(VME_CRCSR_BUF_SIZE, GFP_KERNEL);
bridge->crcsr_bus = (dma_addr_t)bridge->crcsr_kernel;
bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);
if (bridge->crcsr_kernel == NULL)
return -ENOMEM;