[PATCH 2/3] riscv: kgdb: use BREAK_INSTR_SIZE instead of hardcoded value

["Clément Léger" <clement.leger@linux.dev>]

Before commit 550c2aa787d1 ("riscv: KGDB: Remove ".option norvc/.option
rvc" for kgdb_compiled_break"), .norvc was enforced and that resulted
in a non compressed ebreak instruction so the +4 was legit. The
previously mentionned commit removed that option, leading to ebreak
being emitted as c.ebreak when compiled with CONFIG_RISCV_ISA_C=y.

Use BREAK_INSTR_SIZE so epc is incremented by whatever size the break
instruction is.

Fixes: 550c2aa787d1 ("riscv: KGDB: Remove ".option norvc/.option rvc" for kgdb_compiled_break")
Signed-off-by: Clément Léger <clement.leger@linux.dev>
---
 arch/riscv/kernel/kgdb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/kgdb.c b/arch/riscv/kernel/kgdb.c
index 4ad817698af8..121dae87dc68 100644
--- a/arch/riscv/kernel/kgdb.c
+++ b/arch/riscv/kernel/kgdb.c
@@ -365,7 +365,7 @@ static int kgdb_riscv_notify(struct notifier_block *self, unsigned long cmd,
 		return NOTIFY_DONE;
 
 	if (type == KGDB_COMPILED_BREAK)
-		regs->epc += 4;
+		regs->epc += BREAK_INSTR_SIZE;
 
 	local_irq_restore(flags);
 
-- 
2.55.0