Re: [PATCH] compiler-gcc: disable -ftracer for __noclone functions

From: kbuild test robot
Date: Thu Mar 31 2016 - 04:37:16 EST


Hi Paolo,

[auto build test WARNING on v4.6-rc1]
[also build test WARNING on next-20160331]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url: https://github.com/0day-ci/linux/commits/Paolo-Bonzini/compiler-gcc-disable-ftracer-for-__noclone-functions/20160331-154556
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

include/linux/compiler.h:232:8: sparse: attribute 'no_sanitize_address': unknown attribute
>> arch/x86/kvm/vmx.c:8610:13: sparse: attribute '__optimize__': unknown attribute

vim +/__optimize__ +8610 arch/x86/kvm/vmx.c

d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8594 int i, nr_msrs;
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8595 struct perf_guest_switch_msr *msrs;
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8596
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8597 msrs = perf_guest_get_msrs(&nr_msrs);
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8598
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8599 if (!msrs)
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8600 return;
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8601
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8602 for (i = 0; i < nr_msrs; i++)
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8603 if (msrs[i].host == msrs[i].guest)
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8604 clear_atomic_switch_msr(vmx, msrs[i].msr);
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8605 else
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8606 add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8607 msrs[i].host);
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8608 }
d7cd9796 arch/x86/kvm/vmx.c Gleb Natapov 2011-10-05 8609
a3b5ba49 arch/x86/kvm/vmx.c Lai Jiangshan 2011-02-11 @8610 static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
6aa8b732 drivers/kvm/vmx.c Avi Kivity 2006-12-10 8611 {
a2fa3e9f drivers/kvm/vmx.c Gregory Haskins 2007-07-27 8612 struct vcpu_vmx *vmx = to_vmx(vcpu);
d974baa3 arch/x86/kvm/vmx.c Andy Lutomirski 2014-10-08 8613 unsigned long debugctlmsr, cr4;
104f226b arch/x86/kvm/vmx.c Avi Kivity 2010-11-18 8614
104f226b arch/x86/kvm/vmx.c Avi Kivity 2010-11-18 8615 /* Record the guest's net vcpu time for enforced NMI injections. */
104f226b arch/x86/kvm/vmx.c Avi Kivity 2010-11-18 8616 if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
104f226b arch/x86/kvm/vmx.c Avi Kivity 2010-11-18 8617 vmx->entry_time = ktime_get();
104f226b arch/x86/kvm/vmx.c Avi Kivity 2010-11-18 8618

:::::: The code at line 8610 was first introduced by commit
:::::: a3b5ba49a8c58d9a578e016523b047467a41e047 KVM: VMX: add the __noclone attribute to vmx_vcpu_run

:::::: TO: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
:::::: CC: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation