Re: [PATCH] mm/hugetlb: change ENOSPC to ENOMEM in alloc_hugetlb_folio

[Muchun Song <muchun.song@xxxxxxxxx>]

> On Dec 1, 2024, at 09:03, Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxx> wrote:
> 
> The error ENOSPC is translated in vmf_error to VM_FAULT_SIGBUS which is
> further translated in EFAULT in i.e. pin/get_user_pages.
> But when running out of pages/hugepages we expect to see ENOMEM and
> not EFAULT.

Hi Dafna,

Refers to Documentation/mm/hugetlbfs_reserv.rst. I saw:

    If no huge page exists at page fault time, the task is sent
    a **SIGBUS** and often dies an unhappy death.

Seems SIGBUS is expected since it is introduced.

Thanks.