Re: [PATCH retry] arch/ia64/kvm/kvm-ia64.c: Add local_irq_restore in error handling code
Julia Lawall wrote: From: Julia Lawall [EMAIL PROTECTED] There is a call to local_irq_restore in the normal exit case, so it would seem that there should be one on an error return as well. The semantic patch that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) Applied, thanks. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH retry] arch/ia64/kvm/kvm-ia64.c: Add local_irq_restore in error handling code
From: Julia Lawall [EMAIL PROTECTED] There is a call to local_irq_restore in the normal exit case, so it would seem that there should be one on an error return as well. The semantic patch that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // smpl @@ expression l; expression E,E1,E2; @@ local_irq_save(l); ... when != local_irq_restore(l) when != spin_unlock_irqrestore(E,l) when any when strict ( if (...) { ... when != local_irq_restore(l) when != spin_unlock_irqrestore(E1,l) + local_irq_restore(l); return ...; } | if (...) + {local_irq_restore(l); return ...; + } | spin_unlock_irqrestore(E2,l); | local_irq_restore(l); ) // /smpl Signed-off-by: Julia Lawall [EMAIL PROTECTED] --- .../julia/linuxcopy}/arch/ia64/kvm/kvm-ia64.c |5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/home/julia/linux-2.6/arch/ia64/kvm/kvm-ia64.c b/var/julia/linuxcopy/arch/ia64/kvm/kvm-ia64.c index 2672f4d..7a37d06 100644 --- a/home/julia/linux-2.6/arch/ia64/kvm/kvm-ia64.c +++ b/var/julia/linuxcopy/arch/ia64/kvm/kvm-ia64.c @@ -125,9 +125,9 @@ void kvm_arch_hardware_enable(void *garbage) PAGE_KERNEL)); local_irq_save(saved_psr); slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT); + local_irq_restore(saved_psr); if (slot 0) return; - local_irq_restore(saved_psr); spin_lock(vp_lock); status = ia64_pal_vp_init_env(kvm_vsa_base ? @@ -160,9 +160,9 @@ void kvm_arch_hardware_disable(void *garbage) local_irq_save(saved_psr); slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT); + local_irq_restore(saved_psr); if (slot 0) return; - local_irq_restore(saved_psr); status = ia64_pal_vp_exit_env(host_iva); if (status) @@ -1253,6 +1253,7 @@ static int vti_vcpu_setup(struct kvm_vcpu *vcpu, int id) uninit: kvm_vcpu_uninit(vcpu); fail: + local_irq_restore(psr); return r; } -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH retry] arch/ia64/kvm/kvm-ia64.c: Add local_irq_restore in error handling code
On Tue, Jul 22, 2008 at 09:38:18PM +0200, Julia Lawall wrote: There is a call to local_irq_restore in the normal exit case, so it would seem that there should be one on an error return as well. Patch looks good to me: Reviewed-by: Matthew Wilcox [EMAIL PROTECTED] -- Intel are signing my paycheques ... these opinions are still mine Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
RE: [PATCH retry] arch/ia64/kvm/kvm-ia64.c: Add local_irq_restore in error handling code
Julia Lawall wrote: From: Julia Lawall [EMAIL PROTECTED] There is a call to local_irq_restore in the normal exit case, so it would seem that there should be one on an error return as well. The semantic patch that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) Good catch! Excellent patch to find such issues! Xiantao // smpl @@ expression l; expression E,E1,E2; @@ local_irq_save(l); ... when != local_irq_restore(l) when != spin_unlock_irqrestore(E,l) when any when strict ( if (...) { ... when != local_irq_restore(l) when != spin_unlock_irqrestore(E1,l) + local_irq_restore(l); return ...; } if (...) + {local_irq_restore(l); return ...; + } spin_unlock_irqrestore(E2,l); local_irq_restore(l); ) // /smpl Signed-off-by: Julia Lawall [EMAIL PROTECTED] --- .../julia/linuxcopy}/arch/ia64/kvm/kvm-ia64.c |5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/home/julia/linux-2.6/arch/ia64/kvm/kvm-ia64.c b/var/julia/linuxcopy/arch/ia64/kvm/kvm-ia64.c index 2672f4d..7a37d06 100644 --- a/home/julia/linux-2.6/arch/ia64/kvm/kvm-ia64.c +++ b/var/julia/linuxcopy/arch/ia64/kvm/kvm-ia64.c @@ -125,9 +125,9 @@ void kvm_arch_hardware_enable(void *garbage) PAGE_KERNEL)); local_irq_save(saved_psr); slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT); + local_irq_restore(saved_psr); if (slot 0) return; - local_irq_restore(saved_psr); spin_lock(vp_lock); status = ia64_pal_vp_init_env(kvm_vsa_base ? @@ -160,9 +160,9 @@ void kvm_arch_hardware_disable(void *garbage) local_irq_save(saved_psr); slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT); + local_irq_restore(saved_psr); if (slot 0) return; - local_irq_restore(saved_psr); status = ia64_pal_vp_exit_env(host_iva); if (status) @@ -1253,6 +1253,7 @@ static int vti_vcpu_setup(struct kvm_vcpu *vcpu, int id) uninit: kvm_vcpu_uninit(vcpu); fail: + local_irq_restore(psr); return r; } -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html