[PATCH 1/2] riscv: stack: Fixup independent irq stack for CONFIG_FRAME_POINTER=n

guoren
2023-07-15T13:46:10Z

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")
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/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 f910dfccbf5d..f75d97de518a 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -371,7 +371,7 @@ 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",
+ "t0", "t1", "t2", "t3", "t4", "t5", "t6", "s0",
"memory");
} else
#endif
--
2.36.1