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Miller" , Andreas Larsson , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , linux-kernel@vger.kernel.org (open list), llvm@lists.linux.dev (open list:CLANG/LLVM BUILD SUPPORT:Keyword:\b(?i:clang|llvm)\b) Subject: [PATCHv2] sparc: Export mcount for Clang-built modules Date: Fri, 12 Jun 2026 11:15:03 -0700 Message-ID: <20260612181503.4509-1-rosenp@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- v2: add declaration in asm-prototypes.h arch/sparc/include/asm/asm-prototypes.h | 1 + arch/sparc/lib/mcount.S | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/sparc/include/asm/asm-prototypes.h b/arch/sparc/include/a= sm/asm-prototypes.h index 270c51017212..a39a24c53216 100644 --- a/arch/sparc/include/asm/asm-prototypes.h +++ b/arch/sparc/include/asm/asm-prototypes.h @@ -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); diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S index f7f7910eb41e..0309ba2c4712 100644 --- a/arch/sparc/lib/mcount.S +++ b/arch/sparc/lib/mcount.S @@ -21,6 +21,7 @@ EXPORT_SYMBOL(_mcount) .globl mcount .type mcount,#function + EXPORT_SYMBOL(mcount) _mcount: mcount: #ifdef CONFIG_FUNCTION_TRACER -- 2.54.0