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x86/kvm: Add output operand in vmx_handle_external_intr inline asm 

Stacktool generates the following warning:
  stacktool: arch/x86/kvm/vmx.o: vmx_handle_external_intr()+0x67: call without frame pointer save/setup

By adding the stackpointer as an output operand, this patch ensures that a
stack frame is created when CONFIG_FRAME_POINTER is enabled for the inline
assmebly statement.

Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: gleb@kernel.org
Cc: kvm@vger.kernel.org
Cc: live-patching@vger.kernel.org
Cc: pbonzini@redhat.com
Link: http://lkml.kernel.org/r/1453499078-9330-3-git-send-email-chris.j.arges@canonical.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Chris J Arges 2016-01-22 15:44:38 -06:00 committed by Ingo Molnar
parent 16df4ff860
commit 3f62de5f6f
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/vmx.c
View File

@ -8356,6 +8356,7 @@ static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
static void vmx_handle_external_intr(struct kvm_vcpu *vcpu) static void vmx_handle_external_intr(struct kvm_vcpu *vcpu)
{ {
u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
register void *__sp asm(_ASM_SP);
/* /*
* If external interrupt exists, IF bit is set in rflags/eflags on the * If external interrupt exists, IF bit is set in rflags/eflags on the
@ -8388,8 +8389,9 @@ static void vmx_handle_external_intr(struct kvm_vcpu *vcpu)
"call *%[entry]\n\t" "call *%[entry]\n\t"
: :
#ifdef CONFIG_X86_64 #ifdef CONFIG_X86_64
[sp]"=&r"(tmp) [sp]"=&r"(tmp),
#endif #endif
"+r"(__sp)
: :
[entry]"r"(entry), [entry]"r"(entry),
[ss]"i"(__KERNEL_DS), [ss]"i"(__KERNEL_DS),