Hello:
This series was applied to riscv/linux.git (fixes) by Palmer Dabbelt palmer@rivosinc.com:
On Sat, 15 Jul 2023 20:15:04 -0400 you wrote:
From: Guo Ren guoren@linux.alibaba.com
The independent softirq/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.
<+0>: addi sp,sp,-32 <+2>: sd s0,16(sp) <+4>: sd s1,8(sp) <+6>: sd ra,24(sp) <+8>: sd s2,0(sp) <+10>: mv s0,a0 --> compiler allocate s0 for a0 when CONFIG_FRAME_POINTER=n <+12>: jal ra,0xffffffff800bc0ce <irqentry_enter> <+16>: ld a5,56(tp) # 0x38 <+20>: lui a4,0x4 <+22>: mv s1,a0 <+24>: xor a5,a5,sp <+28>: bgeu a5,a4,0xffffffff800bc092 <do_irq+88> <+32>: auipc s2,0x5d <+36>: ld s2,1118(s2) # 0xffffffff801194b8 <irq_stack_ptr> <+40>: add s2,s2,a4 <+42>: addi sp,sp,-8 <+44>: sd ra,0(sp) <+46>: addi sp,sp,-8 <+48>: sd s0,0(sp) <+50>: addi s0,sp,16 --> our code clobber the s0 <+52>: mv sp,s2 <+54>: mv a0,s0 --> a0 got wrong value for handle_riscv_irq <+56>: jal ra,0xffffffff800bbb3a <handle_riscv_irq>
[...]
Here is the summary with links: - [V2,1/2] riscv: stack: Fixup independent irq stack for CONFIG_FRAME_POINTER=n https://git.kernel.org/riscv/c/8d0be64154cf - [V2,2/2] riscv: stack: Fixup independent softirq stack for CONFIG_FRAME_POINTER=n https://git.kernel.org/riscv/c/ebc9cb03b21e
You are awesome, thank you!