From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9EB10251793; Tue, 29 Apr 2025 17:15:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745946939; cv=none; b=TlPbDljjVATcB0eokM8v2oCnfjoQiK92r0gZuAeK3Tl73VRU+YsXktrWq+ahty70k2tDbHvCgKfMbkLgfuPErwadQ0RVxR1KbfR0OMwaa7EaTdEkazHAKGvVM4ShIQxik8qx+BaV7CUeXDJiUOQUBsKshVknX77o1Tlu7pBGDVs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745946939; c=relaxed/simple; bh=f1ZLX+9VfERdMEgMFxNaAgOp/YzeYmUXgpeTTbyRJ9o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nlZ+ve8rqiD423yR5E4U5S7tQqyLgUviGTLYco5nt/xw/5w7bEbrymQWpdAxeIn09VsDdw+y/uyOfT06cM2+7uWl760/z/On2IeIRzz8/JZQh+J1W3UCvD53qSEhlkhdFYvdTlV7UWtGAqJFSaUDFiXLzFjP3K82sjkqvSaH/ZI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0bl2dbHg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0bl2dbHg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 150C0C4CEE3; Tue, 29 Apr 2025 17:15:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745946939; bh=f1ZLX+9VfERdMEgMFxNaAgOp/YzeYmUXgpeTTbyRJ9o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0bl2dbHgzZMRHqzvwuISfRbD2KuR/OttAvyBpGVsSfHippaZSx+RXdMKgCny4lu53 UHWLyp4pmjJJR3LSsu+LL+vBTllDxAgGgSISxZILAsyCNGxE1z3ULPY5bBZPKsg9Vm yYxKhUY+Yges7g2b2ALEJYHXpdVvRKdVEagdek9o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Huacai Chen , WangYuli , Palmer Dabbelt , Sasha Levin Subject: [PATCH 5.10 118/286] riscv: KGDB: Do not inline arch_kgdb_breakpoint() Date: Tue, 29 Apr 2025 18:40:22 +0200 Message-ID: <20250429161112.711564041@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161107.848008295@linuxfoundation.org> References: <20250429161107.848008295@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: WangYuli [ Upstream commit 3af4bec9c1db3f003be4d5ae09b6a737e4be1612 ] The arch_kgdb_breakpoint() function defines the kgdb_compiled_break symbol using inline assembly. There's a potential issue where the compiler might inline arch_kgdb_breakpoint(), which would then define the kgdb_compiled_break symbol multiple times, leading to fail to link vmlinux.o. This isn't merely a potential compilation problem. The intent here is to determine the global symbol address of kgdb_compiled_break, and if this function is inlined multiple times, it would logically be a grave error. Link: https://lore.kernel.org/all/4b4187c1-77e5-44b7-885f-d6826723dd9a@sifive.com/ Link: https://lore.kernel.org/all/5b0adf9b-2b22-43fe-ab74-68df94115b9a@ghiti.fr/ Link: https://lore.kernel.org/all/23693e7f-4fff-40f3-a437-e06d827278a5@ghiti.fr/ Fixes: fe89bd2be866 ("riscv: Add KGDB support") Co-developed-by: Huacai Chen Signed-off-by: Huacai Chen Signed-off-by: WangYuli Link: https://lore.kernel.org/r/F22359AFB6FF9FD8+20250411073222.56820-1-wangyuli@uniontech.com Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/include/asm/kgdb.h | 9 +-------- arch/riscv/kernel/kgdb.c | 8 ++++++++ 2 files changed, 9 insertions(+), 8 deletions(-) diff --git a/arch/riscv/include/asm/kgdb.h b/arch/riscv/include/asm/kgdb.h index 46677daf708bd..cc11c4544cffd 100644 --- a/arch/riscv/include/asm/kgdb.h +++ b/arch/riscv/include/asm/kgdb.h @@ -19,16 +19,9 @@ #ifndef __ASSEMBLY__ +void arch_kgdb_breakpoint(void); extern unsigned long kgdb_compiled_break; -static inline void arch_kgdb_breakpoint(void) -{ - asm(".global kgdb_compiled_break\n" - ".option norvc\n" - "kgdb_compiled_break: ebreak\n" - ".option rvc\n"); -} - #endif /* !__ASSEMBLY__ */ #define DBG_REG_ZERO "zero" diff --git a/arch/riscv/kernel/kgdb.c b/arch/riscv/kernel/kgdb.c index 963ed7edcff26..b0db3350d243b 100644 --- a/arch/riscv/kernel/kgdb.c +++ b/arch/riscv/kernel/kgdb.c @@ -273,6 +273,14 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) regs->epc = pc; } +noinline void arch_kgdb_breakpoint(void) +{ + asm(".global kgdb_compiled_break\n" + ".option norvc\n" + "kgdb_compiled_break: ebreak\n" + ".option rvc\n"); +} + void kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer, char *remcom_out_buffer) { -- 2.39.5