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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 10:11:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 10:11:31 -0700
commit6f51f51582e793ea13e7de7ed6b138f71c51784b (patch)
tree211ecbf88cdf2f183e23da3f8f23153ac6133410 /mm/vmalloc.c
parent76159c20c0bcf5b38178fbfb61049eeb6380bb54 (diff)
parent97ef952a20853fad72087a53fa556fbec45edd8f (diff)
Merge branch 'for-linus-for-3.6-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
Pull DMA-mapping updates from Marek Szyprowski: "Those patches are continuation of my earlier work. They contains extensions to DMA-mapping framework to remove limitation of the current ARM implementation (like limited total size of DMA coherent/write combine buffers), improve performance of buffer sharing between devices (attributes to skip cpu cache operations or creation of additional kernel mapping for some specific use cases) as well as some unification of the common code for dma_mmap_attrs() and dma_mmap_coherent() functions. All extensions have been implemented and tested for ARM architecture." * 'for-linus-for-3.6-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping: ARM: dma-mapping: add support for DMA_ATTR_SKIP_CPU_SYNC attribute common: DMA-mapping: add DMA_ATTR_SKIP_CPU_SYNC attribute ARM: dma-mapping: add support for dma_get_sgtable() common: dma-mapping: introduce dma_get_sgtable() function ARM: dma-mapping: add support for DMA_ATTR_NO_KERNEL_MAPPING attribute common: DMA-mapping: add DMA_ATTR_NO_KERNEL_MAPPING attribute common: dma-mapping: add support for generic dma_mmap_* calls ARM: dma-mapping: fix error path for memory allocation failure ARM: dma-mapping: add more sanity checks in arm_dma_mmap() ARM: dma-mapping: remove custom consistent dma region mm: vmalloc: use const void * for caller argument scatterlist: add sg_alloc_table_from_pages function
Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c7ac8e1b3ac..e03f4c7307a 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1280,7 +1280,7 @@ DEFINE_RWLOCK(vmlist_lock);
struct vm_struct *vmlist;
static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
- unsigned long flags, void *caller)
+ unsigned long flags, const void *caller)
{
vm->flags = flags;
vm->addr = (void *)va->va_start;
@@ -1306,7 +1306,7 @@ static void insert_vmalloc_vmlist(struct vm_struct *vm)
}
static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
- unsigned long flags, void *caller)
+ unsigned long flags, const void *caller)
{
setup_vmalloc_vm(vm, va, flags, caller);
insert_vmalloc_vmlist(vm);
@@ -1314,7 +1314,7 @@ static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
static struct vm_struct *__get_vm_area_node(unsigned long size,
unsigned long align, unsigned long flags, unsigned long start,
- unsigned long end, int node, gfp_t gfp_mask, void *caller)
+ unsigned long end, int node, gfp_t gfp_mask, const void *caller)
{
struct vmap_area *va;
struct vm_struct *area;
@@ -1375,7 +1375,7 @@ EXPORT_SYMBOL_GPL(__get_vm_area);
struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
unsigned long start, unsigned long end,
- void *caller)
+ const void *caller)
{
return __get_vm_area_node(size, 1, flags, start, end, -1, GFP_KERNEL,
caller);
@@ -1397,13 +1397,21 @@ struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
}
struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
- void *caller)
+ const void *caller)
{
return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
-1, GFP_KERNEL, caller);
}
-static struct vm_struct *find_vm_area(const void *addr)
+/**
+ * find_vm_area - find a continuous kernel virtual area
+ * @addr: base address
+ *
+ * Search for the kernel VM area starting at @addr, and return it.
+ * It is up to the caller to do all required locking to keep the returned
+ * pointer valid.
+ */
+struct vm_struct *find_vm_area(const void *addr)
{
struct vmap_area *va;
@@ -1568,9 +1576,9 @@ EXPORT_SYMBOL(vmap);
static void *__vmalloc_node(unsigned long size, unsigned long align,
gfp_t gfp_mask, pgprot_t prot,
- int node, void *caller);
+ int node, const void *caller);
static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
- pgprot_t prot, int node, void *caller)
+ pgprot_t prot, int node, const void *caller)
{
const int order = 0;
struct page **pages;
@@ -1643,7 +1651,7 @@ fail:
*/
void *__vmalloc_node_range(unsigned long size, unsigned long align,
unsigned long start, unsigned long end, gfp_t gfp_mask,
- pgprot_t prot, int node, void *caller)
+ pgprot_t prot, int node, const void *caller)
{
struct vm_struct *area;
void *addr;
@@ -1699,7 +1707,7 @@ fail:
*/
static void *__vmalloc_node(unsigned long size, unsigned long align,
gfp_t gfp_mask, pgprot_t prot,
- int node, void *caller)
+ int node, const void *caller)
{
return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
gfp_mask, prot, node, caller);