linux-kernel - [PATCH 1/4] riscv: avoid kernel hangs when trapped in BUG()

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Date:   Mon, 23 Sep 2019 08:45:14 +0800
From:   Vincent Chen <vincent.chen@...ive.com>
To:     linux-riscv@...ts.infradead.org
Cc:     paul.walmsley@...ive.com, palmer@...ive.com, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, vincent.chen@...ive.com
Subject: [PATCH 1/4] riscv: avoid kernel hangs when trapped in BUG()

When the CONFIG_GENERIC_BUG is disabled by disabling CONFIG_BUG, if a
kernel thread is trapped by BUG(), the whole system will be in the
loop that infinitely handles the ebreak exception instead of entering the
die function. To fix this problem, the do_trap_break() will always call
the die() to deal with the break exception as the type of break is
BUG_TRAP_TYPE_BUG.

Signed-off-by: Vincent Chen <vincent.chen@...ive.com>
---
 arch/riscv/kernel/traps.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 424eb72d56b1..055a937aca70 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -124,23 +124,23 @@ static inline unsigned long get_break_insn_length(unsigned long pc)
 
 asmlinkage void do_trap_break(struct pt_regs *regs)
 {
-#ifdef CONFIG_GENERIC_BUG
 	if (!user_mode(regs)) {
 		enum bug_trap_type type;
 
 		type = report_bug(regs->sepc, regs);
 		switch (type) {
+#ifdef CONFIG_GENERIC_BUG
 		case BUG_TRAP_TYPE_NONE:
 			break;
 		case BUG_TRAP_TYPE_WARN:
 			regs->sepc += get_break_insn_length(regs->sepc);
 			break;
 		case BUG_TRAP_TYPE_BUG:
+#endif /* CONFIG_GENERIC_BUG */
+		default:
 			die(regs, "Kernel BUG");
 		}
 	}
-#endif /* CONFIG_GENERIC_BUG */
-
 	force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->sepc));
 }
 
-- 
2.7.4