How to avoid "version generation failed" warning?

How to avoid "version generation failed" warning?

[Sam Ravnborg]

Hi all.

When building sparc32 allmodconfig I see a lot of warnings like these:

WARNING: modpost: EXPORT symbol "empty_zero_page" [vmlinux] version generation failed, symbol will not be versioned.
Is "empty_zero_page" prototyped in <asm/asm-prototypes.h>?
WARNING: modpost: EXPORT symbol "__udelay" [vmlinux] version generation failed, symbol will not be versioned.
Is "__udelay" prototyped in <asm/asm-prototypes.h>?
WARNING: modpost: EXPORT symbol "__ndelay" [vmlinux] version generation failed, symbol will not be versioned.
Is "__ndelay" prototyped in <asm/asm-prototypes.h>?
WARNING: modpost: EXPORT symbol "__ashldi3" [vmlinux] version generation failed, symbol will not be versioned.
Is "__ashldi3" prototyped in <asm/asm-prototypes.h>?
WARNING: modpost: EXPORT symbol "__ashrdi3" [vmlinux] version generation failed, symbol will not be versioned.
Is "__ashrdi3" prototyped in <asm/asm-prototypes.h>?
WARNING: modpost: EXPORT symbol "__lshrdi3" [vmlinux] version generation failed, symbol will not be versioned.
Is "__lshrdi3" prototyped in <asm/asm-prototypes.h>?
WARNING: modpost: "__udelay" [kernel/locking/locktorture.ko] has no CRC!
WARNING: modpost: "__udelay" [kernel/rcu/rcutorture.ko] has no CRC!
WARNING: modpost: "__udelay" [kernel/rcu/rcuscale.ko] has no CRC!
WARNING: modpost: "__udelay" [kernel/rcu/refscale.ko] has no CRC!
WARNING: modpost: "__ndelay" [kernel/rcu/refscale.ko] has no CRC!
WARNING: modpost: "__udelay" [kernel/time/test_udelay.ko] has no CRC!
WARNING: modpost: "__udelay" [kernel/scftorture.ko] has no CRC!
WARNING: modpost: "__ashrdi3" [fs/quota/quota_tree.ko] has no CRC!
WARNING: modpost: "__ashldi3" [fs/ext4/ext4.ko] has no CRC!
...

I already tried to add the prototypes to asm/asm-prototypes.h - but this
did not have any effect.


Module.symvers extract:
0x00000000      empty_zero_page vmlinux EXPORT_SYMBOL
0xf7370f56      system_state    vmlinux EXPORT_SYMBOL
0xbea5ff1e      static_key_initialized  vmlinux EXPORT_SYMBOL_GPL
0xc2e587d1      reset_devices   vmlinux EXPORT_SYMBOL
0xba497f13      loops_per_jiffy vmlinux EXPORT_SYMBOL
0x05cb9b5c      init_uts_ns     vmlinux EXPORT_SYMBOL_GPL
0xa2b7a1de      init_task       vmlinux EXPORT_SYMBOL
0x00000000      __udelay        vmlinux EXPORT_SYMBOL
0x00000000      __ndelay        vmlinux EXPORT_SYMBOL

Any hints what to do to fix these warnings would be appreciated.

My motivation to fix them is to get rid of the noise while doing
allmodconfig builds.

	Sam

Re: How to avoid "version generation failed" warning?

[Sam Ravnborg]

Hi all.

On Sat, Mar 23, 2024 at 02:14:07PM +0100, Sam Ravnborg wrote:
> Hi all.
> 
> When building sparc32 allmodconfig I see a lot of warnings like these:
> 
> WARNING: modpost: EXPORT symbol "empty_zero_page" [vmlinux] version generation failed, symbol will not be versioned.
> Is "empty_zero_page" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "__udelay" [vmlinux] version generation failed, symbol will not be versioned.
> Is "__udelay" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "__ndelay" [vmlinux] version generation failed, symbol will not be versioned.
> Is "__ndelay" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "__ashldi3" [vmlinux] version generation failed, symbol will not be versioned.
> Is "__ashldi3" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "__ashrdi3" [vmlinux] version generation failed, symbol will not be versioned.
> Is "__ashrdi3" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "__lshrdi3" [vmlinux] version generation failed, symbol will not be versioned.
> Is "__lshrdi3" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: "__udelay" [kernel/locking/locktorture.ko] has no CRC!
> WARNING: modpost: "__udelay" [kernel/rcu/rcutorture.ko] has no CRC!
> WARNING: modpost: "__udelay" [kernel/rcu/rcuscale.ko] has no CRC!
> WARNING: modpost: "__udelay" [kernel/rcu/refscale.ko] has no CRC!
> WARNING: modpost: "__ndelay" [kernel/rcu/refscale.ko] has no CRC!
> WARNING: modpost: "__udelay" [kernel/time/test_udelay.ko] has no CRC!
> WARNING: modpost: "__udelay" [kernel/scftorture.ko] has no CRC!
> WARNING: modpost: "__ashrdi3" [fs/quota/quota_tree.ko] has no CRC!
> WARNING: modpost: "__ashldi3" [fs/ext4/ext4.ko] has no CRC!
> ...
> 
> I already tried to add the prototypes to asm/asm-prototypes.h - but this
> did not have any effect.

When I triggered a re-build of the affected .S files it worked.
(I am used to kbuild handle all dependencies so well...)

Solution seems simple:
- Add missing includes and missing prototypes.
- Include the asm-prototypes in the relevant .S files to trigger rebuild
  when the asm-prototype file changes.

I will prepare a patch and submit it to the sparc list.

	Sam