[PATCH 2/2] riscv: stack: Fixup independent softirq stack for CONFIG_FRAME_POINTER=n

guoren
2023-07-15T13:46:15Z

The independent softirq 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: dd69d07a5a6c ("riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK")
Reported-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
arch/riscv/kernel/irq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index d0577cc6a081..0b58720109db 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -83,7 +83,7 @@ void do_softirq_own_stack(void)
:
: [sp] "r" (sp)
: "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
- "t0", "t1", "t2", "t3", "t4", "t5", "t6",
+ "t0", "t1", "t2", "t3", "t4", "t5", "t6", "s0",
"memory");
} else
#endif