Ubuntu 18.04 ARM64 aarch64 : make kmod failure

[nyue]

Hi,

I have a cluster of Jetson Nanos from Picocluster which I am running some MPI-IO code.

I am hoping to setup OrangeFS for the cluster.

./configure --with-db-backend=lmdb --with-kernel=/lib/modules/4.9.140-tegra/build --prefix=/piconfs/systems/orangefs/2.9.8

However, I am getting compilation error when building the kernel module.

Anyone build the orangefs kernel module for aarch64 ?

picocluster@pc0:~/projects/orangefs/orangefs-v.2.9.8$ make kmod
  CC [M]  /home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-utils.o
In file included from ./include/linux/module.h:26:0,
                 from /home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h:58,
                 from /home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-utils.c:7:
./arch/arm64/include/asm/module.h:22:0: warning: "MODULE_ARCH_VERMAGIC" redefined
 #define MODULE_ARCH_VERMAGIC "aarch64"

In file included from /home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h:46:0,
                 from /home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-utils.c:7:
./include/linux/vermagic.h:25:0: note: this is the location of the previous definition
 #define MODULE_ARCH_VERMAGIC ""

In file included from /home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-utils.c:7:0:
/home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h: In function ‘pvfs2_i_set_nlink’:
/home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h:1432:20: error: assignment of read-only member ‘i_nlink’
     inode->i_nlink = nlink;
                    ^
/home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h: In function ‘pvfs2_i_inc_nlink’:
/home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h:1441:19: error: increment of read-only member ‘i_nlink’
     inode->i_nlink++;
                   ^~
/home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h: In function ‘pvfs2_i_drop_nlink’:
/home/picocluster/projects/orangefs/orangefs-v.2.9.8/src/kernel/linux-2.6/pvfs2-kernel.h:1450:19: error: decrement of read-only member ‘i_nlink’
     inode->i_nlink--;

Cheers

[boydwilson]

We really don't recommend using the out of tree kernel module anymore. OrangeFS was pulled upstream with Linux kernel 4.6, the best performance will be with kernel 5.13 and newer (much better on reads)

• note on different distros, the sources is included with the kernel, but it may not be configured to build, so you may need to enable it and recompile.

I am also going to convert this to a discussion. thanks!