rk3399: test_dec-gst.sh fails: mpp_drm: mmap failed: Invalid argument about kernel HOT 6 CLOSED

You should ask it in mpp repo.
Some changes in mpp make it broken when using 32bit userpsace in arm64 platform.

I have packed a new mpp to fix it, you could have a try.
https://github.com/rockchip-linux/rk-rootfs-build/commit/e206387bcd413e1c0c249bac95c624c0462b5554

from kernel.

Don't make the future pull request for this unless you guys know what it is used for.
You are trying to kill those full 32bits platform.

from kernel.

Could you explain to us that why it will kill 32bits arm platform(correct me if your platform include i386)?

From my understanding, mmap64 in glibc is just a wrap of mmap2, and mmap2 is just a wrap of mmap in arm platform, i can't find any reason that it will break things.

links:
https://github.com/lattera/glibc/blob/a2f34833b1042d5d8eeb263b4cf4caaea138c4ad/sysdeps/unix/sysv/linux/mmap64.c
https://github.com/wzyy2/linux/blob/master/arch/arm/kernel/entry-common.S#L373
https://github.com/wzyy2/linux/blob/master/mm/mmap.c#L1461

from kernel.

from kernel.

It seems kernel commit "drm/rockchip: limit gem buffer to 32bit mapping" would also slove this problem, it will be included in next release, but for mainline kernel, "mmap" will still cause problem.

from kernel.

Thanks @wzyy2 , that's good enough for me.

from kernel.