From 4bd33b568855f5483a6c6d7e4706ef507ab8586b Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Wed, 14 Oct 2015 12:37:35 +0200 Subject: [PATCH] KVM: Remove unnecessary debugfs dentry references KVM creates debugfs files to export VM statistics to userland. To be able to remove them on kvm exit it tracks the files' dentries. Since their parent directory is also tracked and since each parent direntry knows its children we can easily remove them by using debugfs_remove_recursive(kvm_debugfs_dir). Therefore we don't need the extra tracking in the kvm_stats_debugfs_item anymore. Signed-off-by: Janosch Frank Reviewed-By: Sascha Silbe Acked-by: Christian Borntraeger Signed-off-by: Christian Borntraeger --- include/linux/kvm_host.h | 1 - virt/kvm/kvm_main.c | 18 ++++-------------- 2 files changed, 4 insertions(+), 15 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index a754fc08e194..590c46e672df 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1016,7 +1016,6 @@ struct kvm_stats_debugfs_item { const char *name; int offset; enum kvm_stat_kind kind; - struct dentry *dentry; }; extern struct kvm_stats_debugfs_item debugfs_entries[]; extern struct dentry *kvm_debugfs_dir; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 9649a42ee990..be3cef12706c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3447,10 +3447,9 @@ static int kvm_init_debug(void) goto out; for (p = debugfs_entries; p->name; ++p) { - p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, - (void *)(long)p->offset, - stat_fops[p->kind]); - if (p->dentry == NULL) + if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir, + (void *)(long)p->offset, + stat_fops[p->kind])) goto out_dir; } @@ -3462,15 +3461,6 @@ out: return r; } -static void kvm_exit_debug(void) -{ - struct kvm_stats_debugfs_item *p; - - for (p = debugfs_entries; p->name; ++p) - debugfs_remove(p->dentry); - debugfs_remove(kvm_debugfs_dir); -} - static int kvm_suspend(void) { if (kvm_usage_count) @@ -3628,7 +3618,7 @@ EXPORT_SYMBOL_GPL(kvm_init); void kvm_exit(void) { - kvm_exit_debug(); + debugfs_remove_recursive(kvm_debugfs_dir); misc_deregister(&kvm_dev); kmem_cache_destroy(kvm_vcpu_cache); kvm_async_pf_deinit();