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sparc: Export mcount for Clang-built modules

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Clang emits calls to mcount for -pg on sparc64, while the
existing ftrace support only exports the _mcount name. With
FUNCTION_TRACER enabled, modules can therefore keep relocations
against mcount and fail during modpost:

  ERROR: modpost: "mcount" [arch/sparc/kernel/chmc.ko] undefined!

_mcount and mcount are aliases in arch/sparc/lib/mcount.S. Export
the plain mcount alias as well so Clang-built modules can resolve
their profiling call target.

Assisted-by: Codex:GPT-5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
This commit is contained in:
Rosen Penev 2026-06-12 11:15:03 -07:00 committed by Andreas Larsson
parent 852fed2e8b
commit 2416b30ec2
2 changed files with 2 additions and 0 deletions
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1
arch/sparc/include/asm/asm-prototypes.h
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@ -26,6 +26,7 @@ void *memset(void *s, int c, size_t n);
typedef int TItype __attribute__((mode(TI)));
TItype __multi3(TItype a, TItype b);
void _mcount(void);
void mcount(void);
s64 __ashldi3(s64, int);
s64 __lshrdi3(s64, int);

1
arch/sparc/lib/mcount.S
View File

@ -21,6 +21,7 @@
EXPORT_SYMBOL(_mcount)
.globl mcount
.type mcount,#function
EXPORT_SYMBOL(mcount)
_mcount:
mcount:
#ifdef CONFIG_FUNCTION_TRACER