| Message ID | 20231004143054.482091-6-cleger@rivosinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | riscv: cleanup assembly usage of ENTRY()/END() and use local labels | expand |
On Wed, Oct 04, 2023 at 04:30:54PM +0200, Clément Léger wrote: > For the sake of coherency, use local labels in assembly when > applicable. This also avoid kprobes being confused when applying a > kprobe since the size of function is computed by checking where the > next visible symbol is located. This might end up in computing some > function size to be way shorter than expected and thus failing to apply > kprobes to the specified offset. > > Signed-off-by: Clément Léger <cleger@rivosinc.com> > --- > arch/riscv/kvm/vcpu_switch.S | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/riscv/kvm/vcpu_switch.S b/arch/riscv/kvm/vcpu_switch.S > index 8b18473780ac..0c26189aa01c 100644 > --- a/arch/riscv/kvm/vcpu_switch.S > +++ b/arch/riscv/kvm/vcpu_switch.S > @@ -45,7 +45,7 @@ SYM_FUNC_START(__kvm_riscv_switch_to) > REG_L t0, (KVM_ARCH_GUEST_SSTATUS)(a0) > REG_L t1, (KVM_ARCH_GUEST_HSTATUS)(a0) > REG_L t2, (KVM_ARCH_GUEST_SCOUNTEREN)(a0) > - la t4, __kvm_switch_return > + la t4, .Lkvm_switch_return > REG_L t5, (KVM_ARCH_GUEST_SEPC)(a0) > > /* Save Host and Restore Guest SSTATUS */ > @@ -113,7 +113,7 @@ SYM_FUNC_START(__kvm_riscv_switch_to) > > /* Back to Host */ > .align 2 > -__kvm_switch_return: > +.Lkvm_switch_return: > /* Swap Guest A0 with SSCRATCH */ > csrrw a0, CSR_SSCRATCH, a0 > > -- > 2.42.0 > Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
diff --git a/arch/riscv/kvm/vcpu_switch.S b/arch/riscv/kvm/vcpu_switch.S index 8b18473780ac..0c26189aa01c 100644 --- a/arch/riscv/kvm/vcpu_switch.S +++ b/arch/riscv/kvm/vcpu_switch.S @@ -45,7 +45,7 @@ SYM_FUNC_START(__kvm_riscv_switch_to) REG_L t0, (KVM_ARCH_GUEST_SSTATUS)(a0) REG_L t1, (KVM_ARCH_GUEST_HSTATUS)(a0) REG_L t2, (KVM_ARCH_GUEST_SCOUNTEREN)(a0) - la t4, __kvm_switch_return + la t4, .Lkvm_switch_return REG_L t5, (KVM_ARCH_GUEST_SEPC)(a0) /* Save Host and Restore Guest SSTATUS */ @@ -113,7 +113,7 @@ SYM_FUNC_START(__kvm_riscv_switch_to) /* Back to Host */ .align 2 -__kvm_switch_return: +.Lkvm_switch_return: /* Swap Guest A0 with SSCRATCH */ csrrw a0, CSR_SSCRATCH, a0
For the sake of coherency, use local labels in assembly when applicable. This also avoid kprobes being confused when applying a kprobe since the size of function is computed by checking where the next visible symbol is located. This might end up in computing some function size to be way shorter than expected and thus failing to apply kprobes to the specified offset. Signed-off-by: Clément Léger <cleger@rivosinc.com> --- arch/riscv/kvm/vcpu_switch.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)