Problem with compiling ayufans linux kernel

[voegelit]

Hi all

I tried to compile the ayufans kernel for the rockpro64 directly on the rockpro64 itself and on my x86 workstation. But in both cases I get a similar error:

Code:

In function 'hid_report_readreg.constprop',
   inlined from 'rkvr_dev_attr_debug_show' at drivers/hid/hid-rkvr.c:826:7:
drivers/hid/hid-rkvr.c:780:3: warning: 'memcpy' forming offset 2 is out of the bounds [0, 1] of object 'mpu6500_id' with type 'u8' {aka 'unsigned char'} [-Warray-bounds]
error, forbidden warning:hid-rkvr.c:780
  memcpy(data, &buf[1], readlen);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hid/hid-rkvr.c: In function 'rkvr_dev_attr_debug_show':
drivers/hid/hid-rkvr.c:822:5: note: 'mpu6500_id' declared here
 u8 mpu6500_id = 0;
    ^~~~~~~~~~
make[2]: *** [scripts/Makefile.build:277: drivers/hid/hid-rkvr.o] Error 1
make[1]: *** [scripts/Makefile.build:484: drivers/hid] Error 2
make[1]: *** Waiting for unfinished jobs...

I got the source code from here https://github.com/ayufan-rock64/linux-kernel and I used the branch release-4.4.190 which corresponds with the kernel running on my rockpro64. I used the config from arch/arm64/configs/rockchip_linux_defconfig.


I installed some packages on my workstation for cross compiling and tried to build the kernel with the following command, but I get the error from above.

Code:

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j24 Image

I'm able to successfully build the current mainline kernel with this command, but I haven't tried to boot from it. Because I could't cross compile the kernel from ayufan, I tried to compile it on my rockpro64, which is running the buster-minimal Image from ayufan. I installed the following packages on it.

Code:

build-essential libncurses-dev bison flex libssl-dev fakeroot pkg-config python

And used this command to compile it, but I get a similar error message as above.

Code:

make -j6 Image

If anybody has an idea what is wrong with my setup or knows a guide on how to compile this kernel, I would be glad about an answer.

Thanks in advance

[dukla2000]

?
make menuconfig
?
My notes how I got a compile to work are here, but it was a long time ago.

[patstew]

Try:

Code:

KCFLAGS="-Wno-array-bounds -Wno-stringop-overflow" make Image dtbs

[voegelit]

?
make menuconfig
?
My notes how I got a compile to work are here, but it was a long time ago.

Thanks for your reply! I used make menuconfig, forgot to write this in my post.
Btw. thanks for your notes, I used them in the first place, trying to compile the kernel on the rockpro. I rechecked them and the only difference is the repository from ayufan.

In your notes is this repo: https://github.com/ayufan-rock64/linux-mainline-kernel
And I used this (which corresponds to the kernel used in the buster image) https://github.com/ayufan-rock64/linux-kernel

I don' t really know what's the difference between those, but I can successfully build the repo in your notes.

---

Try:

Code:

KCFLAGS="-Wno-array-bounds -Wno-stringop-overflow" make Image dtbs

Thanks for your reply! I can build the kernel with these options. I guess it just disables the compiler errors for overflows? Is it normal that the kernel for aarch64 needs to be compiled with these options or am I doing something wrong?

[patstew]

Thanks for your reply! I can build the kernel with these options. I guess it just disables the compiler errors for overflows? Is it normal that the kernel for aarch64 needs to be compiled with these options or am I doing something wrong?

They're new warnings that weren't checked in older versions of the compiler. They may indicate bugs in the kernel, but if so they're not new bugs.