linux-kernel - [PATCH v4 0/2] riscv: Rework the arch_kgdb

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Message-ID: <D5A83DF3A06E1DF9+20250411072905.55134-1-wangyuli@uniontech.com>
Date: Fri, 11 Apr 2025 15:29:04 +0800
From: WangYuli <wangyuli@...ontech.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr
Cc: wangyuli@...ontech.com,
	chenhuacai@...nel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	vincent.chen@...ive.com,
	palmerdabbelt@...gle.com,
	samuel.holland@...ive.com,
	zhanjun@...ontech.com,
	niecheng1@...ontech.com,
	guanwentao@...ontech.com
Subject: [PATCH v4 0/2] riscv: Rework the arch_kgdb_breakpoint() implementation

1. 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.

2. Remove ".option norvc/.option rvc" to fix a bug that the C extension
   would unconditionally enable even if the kernel is being built with
   CONFIG_RISCV_ISA_C=n.

WangYuli (2):
  riscv: KGDB: Do not inline arch_kgdb_breakpoint()
  riscv: KGDB: Remove ".option norvc/.option rvc" for
    kgdb_compiled_break

 arch/riscv/include/asm/kgdb.h | 9 +--------
 arch/riscv/kernel/kgdb.c      | 6 ++++++
 2 files changed, 7 insertions(+), 8 deletions(-)

-- 
2.49.0