linux-kernel - [PATCH V2 1/2] riscv: stack: Fixup independent irq stack for CONFIG_FRAME

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Date:   Sat, 15 Jul 2023 20:15:05 -0400
From:   guoren@...nel.org
To:     guoren@...nel.org, palmer@...osinc.com, paul.walmsley@...ive.com,
        falcon@...ylab.org, bjorn@...nel.org, conor.dooley@...rochip.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, stable@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V2 1/2] riscv: stack: Fixup independent irq stack for CONFIG_FRAME_POINTER=n

From: Guo Ren <guoren@...ux.alibaba.com>

The independent irq stack uses s0 to save & restore sp, but s0 would be
corrupted when CONFIG_FRAME_POINTER=n. So add s0 in the clobber list to
fix the problem.

Fixes: 163e76cc6ef4 ("riscv: stack: Support HAVE_IRQ_EXIT_ON_IRQ_STACK")
Cc: stable@...r.kernel.org
Reported-by: Zhangjin Wu <falcon@...ylab.org>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/kernel/traps.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index f910dfccbf5d..927347a19847 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -372,6 +372,9 @@ asmlinkage void noinstr do_irq(struct pt_regs *regs)
 		: [sp] "r" (sp), [regs] "r" (regs)
 		: "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
 		  "t0", "t1", "t2", "t3", "t4", "t5", "t6",
+#ifndef CONFIG_FRAME_POINTER
+		  "s0",
+#endif
 		  "memory");
 	} else
 #endif
-- 
2.36.1