Why does request_mem_region() work fine on 32 bit Linux but return NULL on 64 bit?

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Kamikaze10242015-08-12 16:32:51

linux

Kamikaze1024, 2015-08-12 16:32:51

Why does request_mem_region() work fine on 32 bit Linux but return NULL on 64 bit?

There is a device pci driver, it has a request_mem_region() call. On 32-bit Linux everything works correctly, but on 64-bit Linux it returns NULL. What could be the reason?

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Rsa97, 2015-08-12
@Kamikaze1024

The requested memory may have already been allocated to another device. See /proc/iomem

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