From 8b88b0998e35d239e74446cc30f354bdab86df89 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 8 Feb 2008 04:20:26 -0800 Subject: libfs: allow error return from simple attributes Sometimes simple attributes might need to return an error, e.g. for acquiring a mutex interruptibly. In fact we have that situation in spufs already which is the original user of the simple attributes. This patch merged the temporarily forked attributes in spufs back into the main ones and allows to return errors. [akpm@linux-foundation.org: build fix] Signed-off-by: Christoph Hellwig Cc: Cc: Arnd Bergmann Cc: Greg KH Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- virt/kvm/kvm_main.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'virt/kvm') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 3c4fe26096f..32fbf800696 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1186,38 +1186,38 @@ static struct notifier_block kvm_cpu_notifier = { .priority = 20, /* must be > scheduler priority */ }; -static u64 vm_stat_get(void *_offset) +static int vm_stat_get(void *_offset, u64 *val) { unsigned offset = (long)_offset; - u64 total = 0; struct kvm *kvm; + *val = 0; spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) - total += *(u32 *)((void *)kvm + offset); + *val += *(u32 *)((void *)kvm + offset); spin_unlock(&kvm_lock); - return total; + return 0; } DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); -static u64 vcpu_stat_get(void *_offset) +static int vcpu_stat_get(void *_offset, u64 *val) { unsigned offset = (long)_offset; - u64 total = 0; struct kvm *kvm; struct kvm_vcpu *vcpu; int i; + *val = 0; spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) for (i = 0; i < KVM_MAX_VCPUS; ++i) { vcpu = kvm->vcpus[i]; if (vcpu) - total += *(u32 *)((void *)vcpu + offset); + *val += *(u32 *)((void *)vcpu + offset); } spin_unlock(&kvm_lock); - return total; + return 0; } DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); -- cgit v1.2.3