[Xenomai-help] undefined symbols in xeno_nucleus

[Xenomai-help] undefined symbols in xeno_nucleus

[Peter Soetens]

When compiling xenomai-head (master) from today with vanilla Linux
2.6.31.1 for amd64/smp, most of xenomai compiled as modules, I get at
the end of the build process this:

  Building modules, stage 2.
  MODPOST 2169 modules
ERROR: "per_cpu__cpu_tlbstate"
[kernel/xenomai/nucleus/xeno_nucleus.ko] undefined!
ERROR: "per_cpu__irq_stack_union"
[kernel/xenomai/nucleus/xeno_nucleus.ko] undefined!
WARNING: modpost: Found 12 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
make[2]: *** [__modpost] Error 1

And grepping for them gives:

$ wcgrep per_cpu__cpu_tlbstate
./System.map:154:000000000001e100 D per_cpu__cpu_tlbstate
./.tmp_System.map:154:000000000001e100 D per_cpu__cpu_tlbstate

$ vader ~/src/xenomai/linux-2.6.31.1 $ wcgrep per_cpu__irq_stack_union
./System.map:3:0000000000000000 D per_cpu__irq_stack_union
./System.map:42431:ffffffff81774000 A init_per_cpu__irq_stack_union
./.tmp_System.map:3:0000000000000000 D per_cpu__irq_stack_union
./.tmp_System.map:42431:ffffffff81774000 A init_per_cpu__irq_stack_union
./arch/x86/kernel/asm-offsets.s:18246:  .string "per_cpu__irq_stack_union"
./arch/x86/kernel/vmlinux.lds.S:382:. = ASSERT((per_cpu__irq_stack_union == 0),
./arch/x86/kernel/vmlinux.lds:573:init_per_cpu__irq_stack_union =
per_cpu__irq_stack_union + __per_cpu_load;
./arch/x86/kernel/vmlinux.lds:579:. = ASSERT((per_cpu__irq_stack_union == 0),

Any idea what went wrong ?

Also, I hit the 'sparse irqs' issue where ipipe.h complains about
CONFIG_NR_IRQS being too high but the true cause is another option.
Maybe the #error in ipipe.h should be:

#error "CONFIG_NR_CPUS is too large, please lower it or disable
CONFIG_SPARSE_IRQ."

Peter

Re: [Xenomai-help] undefined symbols in xeno_nucleus

[Peter Soetens]

On Fri, Dec 4, 2009 at 14:35, Peter Soetens <peter@domain.hid> wrote:
> When compiling xenomai-head (master) from today with vanilla Linux
> 2.6.31.1 for amd64/smp, most of xenomai compiled as modules, I get at
> the end of the build process this:
>
>  Building modules, stage 2.
>  MODPOST 2169 modules
> ERROR: "per_cpu__cpu_tlbstate"
> [kernel/xenomai/nucleus/xeno_nucleus.ko] undefined!
> ERROR: "per_cpu__irq_stack_union"
> [kernel/xenomai/nucleus/xeno_nucleus.ko] undefined!
> WARNING: modpost: Found 12 section mismatch(es).
> To see full details build your kernel with:
> 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
> make[2]: *** [__modpost] Error 1

This goes away when compiling xeno_nucleus into the kernel.

Peter

Re: [Xenomai-help] undefined symbols in xeno_nucleus

[Jan Kiszka]

Peter Soetens wrote:
> When compiling xenomai-head (master) from today with vanilla Linux
> 2.6.31.1 for amd64/smp, most of xenomai compiled as modules, I get at
> the end of the build process this:
> 
>   Building modules, stage 2.
>   MODPOST 2169 modules
> ERROR: "per_cpu__cpu_tlbstate"
> [kernel/xenomai/nucleus/xeno_nucleus.ko] undefined!

This is only exported by I-pipe for 32-bit.

> ERROR: "per_cpu__irq_stack_union"
> [kernel/xenomai/nucleus/xeno_nucleus.ko] undefined!

This not exported at all.

Likely both issues require a new I-pipe patch - unless we can remove the
need for them.

> WARNING: modpost: Found 12 section mismatch(es).
> To see full details build your kernel with:
> 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
> make[2]: *** [__modpost] Error 1
> 
> And grepping for them gives:
> 
> $ wcgrep per_cpu__cpu_tlbstate
> ./System.map:154:000000000001e100 D per_cpu__cpu_tlbstate
> ./.tmp_System.map:154:000000000001e100 D per_cpu__cpu_tlbstate
> 
> $ vader ~/src/xenomai/linux-2.6.31.1 $ wcgrep per_cpu__irq_stack_union
> ./System.map:3:0000000000000000 D per_cpu__irq_stack_union
> ./System.map:42431:ffffffff81774000 A init_per_cpu__irq_stack_union
> ./.tmp_System.map:3:0000000000000000 D per_cpu__irq_stack_union
> ./.tmp_System.map:42431:ffffffff81774000 A init_per_cpu__irq_stack_union
> ./arch/x86/kernel/asm-offsets.s:18246:  .string "per_cpu__irq_stack_union"
> ./arch/x86/kernel/vmlinux.lds.S:382:. = ASSERT((per_cpu__irq_stack_union == 0),
> ./arch/x86/kernel/vmlinux.lds:573:init_per_cpu__irq_stack_union =
> per_cpu__irq_stack_union + __per_cpu_load;
> ./arch/x86/kernel/vmlinux.lds:579:. = ASSERT((per_cpu__irq_stack_union == 0),
> 
> Any idea what went wrong ?
> 
> Also, I hit the 'sparse irqs' issue where ipipe.h complains about
> CONFIG_NR_IRQS being too high but the true cause is another option.
> Maybe the #error in ipipe.h should be:
> 
> #error "CONFIG_NR_CPUS is too large, please lower it or disable
> CONFIG_SPARSE_IRQ."

Removing this limitation is on our agenda.

Jan

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