Re: [PATCH v4] igb_uio: fix possible mmap failure for Linux >= v4.5

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2016-07-05 16:00, Ferruh Yigit:
> mmap the iomem range of the PCI device fails for kernels that
> enabled CONFIG_IO_STRICT_DEVMEM option:
> 
> EAL: pci_map_resource():
>          cannot mmap(39, 0x7f1c51800000, 0x100000, 0x0):
>          Invalid argument (0xffffffffffffffff)
> 
> CONFIG_IO_STRICT_DEVMEM is introduced in Linux v4.5 and not enabled
> by default:
> Linux commit: 90a545e restrict /dev/mem to idle io memory ranges
> 
> As a workaround igb_uio can stop reserving PCI memory resources, from
> kernel point of view iomem region looks like idle and mmap works
> again. This matches uio_pci_generic usage.
> 
> With this update device iomem range is not protected against any
> other kernel drivers or userspace access. But this  shouldn't
> be a problem for dpdk usage module since purpose of the igb_uio
> module is to provide userspace access.
> 
> Fixes: af75078fece3 ("first public release")
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

Applied, thanks

I suggested to apply it in RC3 but we have no comments.
That's why it is part of RC2.