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

[Marco Elver <elver@google.com>]

On Wed, Jan 07, 2026 at 01:45PM -0700, Nathan Chancellor wrote:
> 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

This works:

--- a/include/linux/compiler-context-analysis.h
+++ b/include/linux/compiler-context-analysis.h
@@ -6,7 +6,7 @@
 #ifndef _LINUX_COMPILER_CONTEXT_ANALYSIS_H
 #define _LINUX_COMPILER_CONTEXT_ANALYSIS_H
 
-#if defined(WARN_CONTEXT_ANALYSIS) && !defined(__CHECKER__)
+#if defined(WARN_CONTEXT_ANALYSIS) && !defined(__CHECKER__) && !defined(__GENKSYMS__)
 
I guess the genksyms parser just can't deal with some of the syntax
(just like __CHECKER__).