build module icp: compiler warning : objtool unsupported stack pointer realignment

[IslandLife]

System information

Type	Version/Name
Distribution Name	Ubuntu
Distribution Version	Ubuntu 19.04 disco
Linux Kernel	5.0.0-27-generic
Architecture	x86_64
ZFS Version	0.8.0 280_gfcd37b622
SPL Version	-

Describe the problem you're observing

Warnings on compilation produced by this compiler .

# gcc --version
gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0

These are also present in previous (<#280) releases.
As warnings (and not errors) the build continues - but it does leave a doubt if the
module functions as it should.

Describe how to reproduce the problem

git clone
cd zfs
./autogen
./configure prefix=
make

Include any warning/errors/backtraces from the system logs

Example:

Making all in module
/zfs_on_linux/zfs/module/icp/asm-x86_64/sha1/sha1-x86_64.o: warning: objtool: sha1_block_data_order()+0x11: unsupported stack pointer realignment
/zfs_on_linux/zfs/module/icp/asm-x86_64/sha2/sha256_impl.o: warning: objtool: SHA256TransformBlocks()+0x19: unsupported stack pointer realignment
/zfs_on_linux/zfs/module/icp/asm-x86_64/sha2/sha512_impl.o: warning: objtool: SHA512TransformBlocks()+0x1c: unsupported stack pointer realignment

[behlendorf]

@IslandLife thanks for reporting this. These warnings are safe to ignore and were investigated in #6950 but not yet resolved.

[stale]

This issue has been automatically marked as "stale" because it has not had any activity for a while. It will be closed in 90 days if no further activity occurs. Thank you for your contributions.