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authorRussell King <rmk+kernel@arm.linux.org.uk>2009-12-18 14:10:03 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-16 00:39:11 +0300
commit31aa8fd6fd30b0f36416df7d09619768d26b4332 (patch)
treed44a7edc5287cf73df43206712e3736ae9b1de5a /arch/arm/mm/ioremap.c
parent7284ce6c9f6153d1777df5f310c959724d1bd446 (diff)
downloadlinux-31aa8fd6fd30b0f36416df7d09619768d26b4332.tar.xz
ARM: Add caller information to ioremap
This allows the procfs vmallocinfo file to show who created the ioremap regions. Note: __builtin_return_address(0) doesn't do what's expected if its used in an inline function, so we leave __arm_ioremap callers in such places alone. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/ioremap.c')
-rw-r--r--arch/arm/mm/ioremap.c57
1 files changed, 34 insertions, 23 deletions
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 0ab75c60f7cf..28c8b950ef04 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -139,8 +139,8 @@ void __check_kvm_seq(struct mm_struct *mm)
* which requires the new ioremap'd region to be referenced, the CPU will
* reference the _old_ region.
*
- * Note that get_vm_area() allocates a guard 4K page, so we need to mask
- * the size back to 1MB aligned or we will overflow in the loop below.
+ * Note that get_vm_area_caller() allocates a guard 4K page, so we need to
+ * mask the size back to 1MB aligned or we will overflow in the loop below.
*/
static void unmap_area_sections(unsigned long virt, unsigned long size)
{
@@ -254,22 +254,8 @@ remap_area_supersections(unsigned long virt, unsigned long pfn,
}
#endif
-
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- *
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
- * have to convert them into an offset in a page-aligned mapping, but the
- * caller shouldn't need to know that small detail.
- *
- * 'flags' are the extra L_PTE_ flags that you want to specify for this
- * mapping. See <asm/pgtable.h> for more information.
- */
-void __iomem *
-__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
- unsigned int mtype)
+void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
+ unsigned long offset, size_t size, unsigned int mtype, void *caller)
{
const struct mem_type *type;
int err;
@@ -291,7 +277,7 @@ __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
*/
size = PAGE_ALIGN(offset + size);
- area = get_vm_area(size, VM_IOREMAP);
+ area = get_vm_area_caller(size, VM_IOREMAP, caller);
if (!area)
return NULL;
addr = (unsigned long)area->addr;
@@ -318,10 +304,9 @@ __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
flush_cache_vmap(addr, addr + size);
return (void __iomem *) (offset + addr);
}
-EXPORT_SYMBOL(__arm_ioremap_pfn);
-void __iomem *
-__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
+void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
+ unsigned int mtype, void *caller)
{
unsigned long last_addr;
unsigned long offset = phys_addr & ~PAGE_MASK;
@@ -334,7 +319,33 @@ __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
if (!size || last_addr < phys_addr)
return NULL;
- return __arm_ioremap_pfn(pfn, offset, size, mtype);
+ return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
+ caller);
+}
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void __iomem *
+__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
+ unsigned int mtype)
+{
+ return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
+ __builtin_return_address(0));
+}
+EXPORT_SYMBOL(__arm_ioremap_pfn);
+
+void __iomem *
+__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
+{
+ return __arm_ioremap_caller(phys_addr, size, mtype,
+ __builtin_return_address(0));
}
EXPORT_SYMBOL(__arm_ioremap);