IMX7D print alloc_contig_range: [ac0c0, ac0d4) PFNs busy

[864535720]

Hello everyone,

    I am using the official MCIMX7SABRE development board. My Linux version is 4.9.88.

   When I was doing serial port data transmission and testing, I found that the kernel was printing:
Alloc_contig_range: [b0900, b0914) PFNs busy
Alloc_contig_range: [b0920, b0934) PFNs busy
What is the cause of this? Is there any way to fix it?

I look forward to anyone's reply.

[igorpadykov]

Hi 其东 刘

these messages are from CMA (Contiguous Memory Allocator) allocation

as for example reported on below link and one try to increase cma size

https://bugzilla.redhat.com/show_bug.cgi?id=1387793 

Try latest nxp inux L4.14.98
linux-imx - i.MX Linux kernel 

Best regards
igor
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