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SubjectRe: [PATCH] KVM: replace DEFINE_SIMPLE_ATTRIBUTE with DEFINE_DEBUGFS_ATTRIBUTE
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On 11/1/22 08:25, Bo Liu wrote:
> Fix the following coccicheck warning:
> virt/kvm/kvm_main.c:3847:0-23: WARNING
> vcpu_get_pid_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE
>
> Signed-off-by: Bo Liu <liubo03@inspur.com>
> ---
> virt/kvm/kvm_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index f1df24c2bc84..3f383f27d3d7 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3844,7 +3844,7 @@ static int vcpu_get_pid(void *data, u64 *val)
> return 0;
> }
>
> -DEFINE_SIMPLE_ATTRIBUTE(vcpu_get_pid_fops, vcpu_get_pid, NULL, "%llu\n");
> +DEFINE_DEBUGFS_ATTRIBUTE(vcpu_get_pid_fops, vcpu_get_pid, NULL, "%llu\n");
>
> static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
> {

If you really wanted to do this, you would also have to replace
debugfs_create_file with debugfs_create_file_unsafe.

However, this is not a good idea. The rationale in the .cocci file is
that "DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file() imposes some
significant overhead", but this should not really be relevant for a
debugfs file.

Such a patch would only make sense if there was a version of
debugfs_create_file_unsafe() with a less-terrible name (e.g.
debugfs_create_simple_attr?), which could _only_ be used with fops
created by DEFINE_DEBUGFS_ATTRIBUTE. Without such a type-safe trick,
the .cocci file is only adding confusion to perfectly fine code.

Paolo

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