On 07/11, Jiri Olsa wrote:
>
> +static unsigned long find_nearest_trampoline(unsigned long vaddr)
> +{
> + struct vm_unmapped_area_info info = {
> + .length = PAGE_SIZE,
> + .align_mask = ~PAGE_MASK,
> + };
> + unsigned long low_limit, high_limit;
> + unsigned long low_tramp, high_tramp;
> + unsigned long call_end = vaddr + 5;
> +
> + if (check_add_overflow(call_end, INT_MIN, &low_limit))
> + low_limit = PAGE_SIZE;
> +
> + high_limit = call_end + INT_MAX;
> +
> + /* Search up from the caller address. */
> + info.low_limit = call_end;
> + info.high_limit = min(high_limit, TASK_SIZE);
> + high_tramp = vm_unmapped_area(&info);
> +
> + /* Search down from the caller address. */
> + info.low_limit = max(low_limit, PAGE_SIZE);
> + info.high_limit = call_end;
> + info.flags = VM_UNMAPPED_AREA_TOPDOWN;
> + low_tramp = vm_unmapped_area(&info);
> +
> + if (IS_ERR_VALUE(high_tramp) && IS_ERR_VALUE(low_tramp))
> + return -ENOMEM;
> + if (IS_ERR_VALUE(high_tramp))
> + return low_tramp;
> + if (IS_ERR_VALUE(low_tramp))
> + return high_tramp;
> +
> + /* Return address that's closest to the caller address. */
> + if (call_end - low_tramp < high_tramp - call_end)
> + return low_tramp;
> + return high_tramp;
> +}
IIUC, nothing else has changed since I've acked the previous version?
Then my ack still stands,
Acked-by: Oleg Nesterov <o...@redhat.com>
