[PATCH 13/15] ARM: make mach/io.h include optional
Rob Herring
robherring2 at gmail.com
Wed Feb 15 09:14:00 EST 2012
On 02/14/2012 06:25 PM, Nicolas Pitre wrote:
> On Tue, 14 Feb 2012, Russell King - ARM Linux wrote:
>
>> On Tue, Feb 14, 2012 at 05:09:01PM -0600, Rob Herring wrote:
>>> BTW, I noticed some static mappings at 0xffxxxxxx. Are those even a
>>> valid address?
>>
>> Nothing invalid about them as such, but I have tried to discourage their
>> use in case we decide that we want to go for a default 14MB DMA region.
>
> They should be invalid, and would be flagged by this code in
> create_mapping():
>
> if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
> md->virtual >= PAGE_OFFSET &&
> (md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END))
> {
> printk(KERN_WARNING "BUG: mapping for 0x%08llx"
> " at 0x%08lx out of vmalloc space\n",
> (long long)__pfn_to_phys((u64)md->pfn), md->virtual);
> }
>
> given that VMALLOC_END is now defined as 0xff000000.
>
> What are those static mappings at 0xffxxxxxx? I was looking for them
> while reworking this code but I might have missed some.
>
TS78XX_FPGA_REGS_VIRT_BASE
IXP4XX_PERIPHERAL_BASE_VIRT
IXP4XX_EXP_CFG_BASE_VIRT
IXP4XX_PCI_CFG_BASE_VIRT
IXP4XX_DEBUG_UART_BASE_VIRT
CLPS7111_VIRT_BASE
u300-regs.h
cns3xxx.h
Rob
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