[yocto] Problems with building out-of-tree modules in morty

[Bogusz Brodziński]

Hi,
Thank you Raj.
what was missing in linux-xlnx rev (tag xilinx-v2016.1.01) was

--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -43,6 +43,7 @@ CHECKFLAGS    += -D__aarch64__

 ifeq ($(CONFIG_ARM64_ERRATUM_843419), y)
 KBUILD_CFLAGS_MODULE   += -mcmodel=large
+KBUILD_CFLAGS_MODULE += $(call cc-option, -mpc-relative-literal-loads)
 endif


(summary)
Linux kernel 4.4.x , aarch64 , gcc 6 , CONFIG_ARM64_ERRATUM_843419=y
,  out-of-tree kernel modules , modprobe error unsupported RELA relocation:
275
solution: https://github.com/torvalds/linux/commit/
67dfa1751ce71e629aad7c438e1678ad41054677

Best regards,
Bogusz Brodzinski




On Tue, Jan 24, 2017 at 8:22 PM, Khem Raj <raj.khem at gmail.com> wrote:

>
>
> On 1/24/17 7:16 AM, Bogusz Brodziński wrote:
> > Hi,
> >
> > TL;DR after migrating from jethro to morty my out-of-tree modules do not
> > load.
> >
> > Long version:
> > Im developing uio driver for a custom FPGA. The base is xilinx zu15
> > (note: as the explanation will go on I *think* it will be clear that
> > this is not related to meta-xilinx).
> > It's basically a debug interface that generates IRQ-like events on files
> > (poll) for newly developed/tested features. The initial structure was
> > poky jethro, meta-xilinx with linux-xlnx 4.4 for aarch64. The module is
> > basically uio driver, but creates individual uio for each signal. The
> > makefile is straight from
> > https://www.yoctoproject.org/docs/2.2/kernel-dev/kernel-dev.html and the
> > recipee inherits from module.
> > When using jethro the module got built out-of-tree with no problem and I
> > could load it. After migrating to morty (I also bumped meta-xilinx rev,
> > but I use the same kernel SRCREV and project layer) I still can build
> > the module, but when loading it I get:
> >
> > $ modprobe uio_pdrv_testirq
> > [   79.059558] module uio_pdrv_testirq: unsupported RELA relocation: 275
> > modprobe: can't load module uio_pdrv_testirq
> > (testirq/uio_pdrv_testirq.ko): invalid module format
> >
> > $ modinfo uio_pdrv_testirq
> > filename:       testirq/uio_pdrv_testirq.ko
> > license:        GPL v2
> > author:         BB
> > description:    Userspace I/O test driver irq handler
> > depends:
> > vermagic:       4.4.0-xilinx SMP preempt mod_unload modversions aarch64
> >
> > I looked for a solution and found this
> > http://lists.infradead.org/pipermail/linux-arm-kernel/
> 2015-October/375429.html
> > thread
> > I checked that I have all the ERRATUM enabled (with emphasys on
> > ARM64_ERRATUM_843419):
> > CONFIG_ARM64_ERRATUM_826319=y
> > CONFIG_ARM64_ERRATUM_827319=y
> > CONFIG_ARM64_ERRATUM_824069=y
> > CONFIG_ARM64_ERRATUM_819472=y
> > CONFIG_ARM64_ERRATUM_832075=y
> > CONFIG_ARM64_ERRATUM_845719=y
> > CONFIG_ARM64_ERRATUM_843419=y
> >
> > and I added
> > CFLAGS_MODULE  += -mcmodel=large
> >
> > Result: no change; testirq still fails to load.
> >
> > I would be grateful for any suggestions where to look or what to do next.
> >
>
> Backport
>
> https://github.com/torvalds/linux/commit/df057cc7b4fa59e9b55f07ffdb6c62
> bf02e99a00
>
> https://github.com/torvalds/linux/commit/67dfa1751ce71e629aad7c438e1678
> ad41054677
>
> To your kernel. Additionally  you also can have gcc fix
>
> https://github.com/kraj/gcc/commit/947be775c188312ff802d9f63dbdcc
> d017cb4a29
>
> hopefully these will help
>
> > Best regards,
> > Bogusz Brodzinski
> >
> >
> >
> --
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