From: Vincent Chen <vincent.chen@sifive.com>
To: linux-riscv@lists.infradead.org
Cc: vincent.chen@sifive.com, palmer@sifive.com,
linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu,
paul.walmsley@sifive.com
Subject: [PATCH 2/4] rsicv: avoid sending a SIGTRAP to a user thread trapped in WARN()
Date: Mon, 23 Sep 2019 08:45:15 +0800 [thread overview]
Message-ID: <1569199517-5884-3-git-send-email-vincent.chen@sifive.com> (raw)
In-Reply-To: <1569199517-5884-1-git-send-email-vincent.chen@sifive.com>
On RISC-V, when the kernel runs code on behalf of a user thread, and the
kernel executes a WARN() or WARN_ON(), the user thread will be sent
a bogus SIGTRAP. Fix the RISC-V kernel code to not send a SIGTRAP when
a WARN()/WARN_ON() is executed.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
---
arch/riscv/kernel/traps.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 055a937aca70..82f42a55451e 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -134,7 +134,7 @@ asmlinkage void do_trap_break(struct pt_regs *regs)
break;
case BUG_TRAP_TYPE_WARN:
regs->sepc += get_break_insn_length(regs->sepc);
- break;
+ return;
case BUG_TRAP_TYPE_BUG:
#endif /* CONFIG_GENERIC_BUG */
default:
--
2.7.4
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next prev parent reply other threads:[~2019-09-23 0:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-23 0:45 [PATCH 0/4] riscv: correct the do_trap_break() Vincent Chen
2019-09-23 0:45 ` [PATCH 1/4] riscv: avoid kernel hangs when trapped in BUG() Vincent Chen
2019-09-27 22:25 ` Christoph Hellwig
2019-10-04 18:26 ` Paul Walmsley
2019-09-23 0:45 ` Vincent Chen [this message]
2019-09-27 22:27 ` [PATCH 2/4] rsicv: avoid sending a SIGTRAP to a user thread trapped in WARN() Christoph Hellwig
2019-09-27 22:56 ` Christoph Hellwig
2019-09-30 0:22 ` Vincent Chen
2019-10-04 18:26 ` Paul Walmsley
2019-09-23 0:45 ` [PATCH 3/4] riscv: Correct the handling of unexpected ebreak in do_trap_break() Vincent Chen
2019-09-27 22:43 ` Christoph Hellwig
2019-10-04 18:28 ` Paul Walmsley
2019-09-23 0:45 ` [PATCH 4/4] riscv: remove the switch statement " Vincent Chen
2019-09-27 22:47 ` Christoph Hellwig
2019-10-07 16:08 ` Paul Walmsley
2019-10-07 16:10 ` Christoph Hellwig
2019-10-07 16:30 ` Paul Walmsley
2019-10-08 0:14 ` Vincent Chen
2019-10-08 17:07 ` Paul Walmsley
2019-10-09 22:26 ` Paul Walmsley
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