Re: [PATCH v3 1/2] panic: add option to dump task maps info in panic_print

[Oleg Nesterov]

On 09/22, qiwu.chen wrote:
>
> +	for_each_vma(vmi, vma) {
> +		struct file *file = vma->vm_file;
> +		int flags = vma->vm_flags;
> +		unsigned long long pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
> +		struct anon_vma_name *anon_name = NULL;
> +		struct mm_struct *mm = vma->vm_mm;
> +		char buf[256] = {0};
> +		const char *name = NULL;
> +
> +		if (mm)
> +			anon_name = anon_vma_name(vma);
> +
> +		if (file) {
> +			if (anon_name) {
> +				snprintf(buf, sizeof(buf), "[anon_shmem:%s]", anon_name->name);
> +				name = buf;
> +			} else {
> +				char *f_path = d_path(file_user_path(file), buf, sizeof(buf));
> +
> +				name = IS_ERR(f_path) ? "?" : f_path;
> +			}
> +			goto print;
> +		}
> +
> +		if (vma->vm_ops && vma->vm_ops->name) {
> +			name = vma->vm_ops->name(vma);
> +			if (name)
> +				goto print;
> +		}
> +
> +		name = arch_vma_name(vma);
> +		if (!name) {
> +			if (mm) {
> +				if (vma_is_initial_heap(vma))
> +					name = "[heap]";
> +				else if (vma_is_initial_stack(vma))
> +					name = "[stack]";
> +			} else
> +				name = "[vdso]";
> +
> +			if (anon_name) {
> +				snprintf(buf, sizeof(buf), "[anon:%s]", anon_name->name);
> +				name = buf;
> +			}
> +		}
> +

Wouldn't it be better to export/reuse get_vma_name() rather than duplicate
its code ?

Oleg.