On 02/28/2017 10:34 PM, Michael Ellerman wrote:
Jason Baron <jbaron@xxxxxxxxxx> writes:
...
I also checked all the other .ko files and they were properly aligned.
So I think this should hopefully work, and I like that its not a
per-arch fix.
Sachin, sorry to bother you again, but I'm hoping you can try David's
latest patch to scripts/module-common.lds, just to test in your setup.
It does fix the problem.
I was reproducing with crc_t10dif:
[ 695.890552] ------------[ cut here ]------------
[ 695.890709] WARNING: CPU: 15 PID: 3019 at ../kernel/jump_label.c:287 static_key_set_entries+0x74/0xa0
[ 695.890710] Modules linked in: crc_t10dif(+) crct10dif_generic crct10dif_common ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio libcrc32c kvm virtio_balloon binfmt_misc autofs4 virtio_net virtio_pci virtio_ring virtio
Which had:
[21] __jump_table PROGBITS 0000000000000000 0004e8 000018 00 WA 0 0 1
And now has:
[18] __jump_table PROGBITS 0000000000000000 0004d0 000018 00 WA 0 0 8
And all other modules have an alignment of 8 on __jump_table, as expected.
I'm inclined to merge a version of the balign patch for powerpc anyway,
just to be on the safe side. I guess the old code was coping fine with
the unaligned keys, but it still makes me nervous.
The original "balign patch" has a couple of problems:
1) 4-byte alignment is not sufficient for 64-bit kernels
2) It is redundant if the linker script patch is accepted.
cheers
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