Re: [peterz-queue:locking/core 34/39] WARNING: modpost: EXPORT symbol "stack_depot_save_flags" [vmlinux] version generation failed, symbol will not be versioned.

[Nathan Chancellor <nathan@kernel.org>]

On Wed, Jan 07, 2026 at 12:46:08PM +0100, Heiko Carstens wrote:
> On Mon, Jan 05, 2026 at 04:35:20PM +0100, Peter Zijlstra wrote:
> > > commit: ee771bab5add646af678f7a40b6272c21a0964d7 [34/39] stackdepot: Enable context analysis
> > > All warnings (new ones prefixed by >>, old ones prefixed by <<):
> > > 
> > > >> WARNING: modpost: EXPORT symbol "stack_depot_save_flags" [vmlinux] version generation failed, symbol will not be versioned.
> > > Is "stack_depot_save_flags" prototyped in <asm/asm-prototypes.h>?
> > > >> WARNING: modpost: EXPORT symbol "stack_depot_save" [vmlinux] version generation failed, symbol will not be versioned.
> > > Is "stack_depot_save" prototyped in <asm/asm-prototypes.h>?
> > 
> > Heiko, I'm seeing these warnings, and I can reproduce in a local build.
> > But I have to note that its just one more of an already existing string
> > of similar failures.
> > 
> > I don't see anything like this on x86, not have I had robot reports for
> > other architectures. As such, I'm considering this a pre-existing s390
> > issue.
> > 
> > Please let me know if this is something you want me to look at
> > nevertheless.
> 
> Sorry, to be more precise: I haven't seen anything like this before on s390.
> All other occurences are also new and come with EXPORT_SYMBOL statements
> within files where context analysis has been enabled.
> 
> When enabling CONFIG_MODVERSIONS I see this also for x86 builds.
> 
> I assume you cannot see this error pattern for s390 builds with
> context analysis disabled?

Something about the context analysis makes genksyms fall over, running
it manually on kernel/sched/core.i with '-w' to show warnings reveals
many new "syntax error" instances. I don't see any warnings when using
gendwarfksyms. Maybe it is context_lock_struct, as that is the first
error I see in the list:

  include/linux/spinlock_types_raw.h:14: syntax error

Cheers,
Nathan