From 4b7b948b1fcde59d9a0085237be0060e825216fc Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 6 Sep 2016 14:59:41 +0200 Subject: [PATCH] vme: fake: fix build for 64-bit dma_addr_t 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 Acked-by: Martyn Welch Signed-off-by: Greg Kroah-Hartman --- drivers/vme/bridges/vme_fake.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/drivers/vme/bridges/vme_fake.c b/drivers/vme/bridges/vme_fake.c index 7ef298b289f4..ebf35d305321 100644 --- a/drivers/vme/bridges/vme_fake.c +++ b/drivers/vme/bridges/vme_fake.c @@ -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;