svn commit: r351456 - head/sys/amd64/amd64

[Conrad Meyer]

Hi Konstantin,

What is the motivation for this change?  The commit message doesn't
really describe why it was done.

Thanks,
Conrad

On Sat, Aug 24, 2019 at 8:28 AM Konstantin Belousov <kib at freebsd.org> wrote:
>
> Author: kib
> Date: Sat Aug 24 15:28:40 2019
> New Revision: 351456
> URL: https://svnweb.freebsd.org/changeset/base/351456
>
> Log:
>   Do not constrain allocations for doublefault, boot, and mce stacks.
>
>   All these stacks are used only once (doublefault, boot) or very rare
>   (mce).
>
>   Reviewed by:  markj
>   Tested by:    pho
>   Sponsored by: The FreeBSD Foundation
>   Differential revision:        https://reviews.freebsd.org/D21320
>
> Modified:
>   head/sys/amd64/amd64/mp_machdep.c
>
> Modified: head/sys/amd64/amd64/mp_machdep.c
> ==============================================================================
> --- head/sys/amd64/amd64/mp_machdep.c   Sat Aug 24 15:25:53 2019        (r351455)
> +++ head/sys/amd64/amd64/mp_machdep.c   Sat Aug 24 15:28:40 2019        (r351456)
> @@ -475,13 +475,11 @@ native_start_all_aps(void)
>                         domain = acpi_pxm_get_cpu_locality(apic_id);
>  #endif
>                 /* allocate and set up an idle stack data page */
> -               bootstacks[cpu] = (void *)kmem_malloc_domainset(
> -                   DOMAINSET_FIXED(domain), kstack_pages * PAGE_SIZE,
> +               bootstacks[cpu] = (void *)kmem_malloc(kstack_pages * PAGE_SIZE,
>                     M_WAITOK | M_ZERO);
> -               doublefault_stack = (char *)kmem_malloc_domainset(
> -                   DOMAINSET_FIXED(domain), PAGE_SIZE, M_WAITOK | M_ZERO);
> -               mce_stack = (char *)kmem_malloc_domainset(
> -                   DOMAINSET_FIXED(domain), PAGE_SIZE, M_WAITOK | M_ZERO);
> +               doublefault_stack = (char *)kmem_malloc(PAGE_SIZE, M_WAITOK |
> +                   M_ZERO);
> +               mce_stack = (char *)kmem_malloc(PAGE_SIZE, M_WAITOK | M_ZERO);
>                 nmi_stack = (char *)kmem_malloc_domainset(
>                     DOMAINSET_FIXED(domain), PAGE_SIZE, M_WAITOK | M_ZERO);
>                 dbg_stack = (char *)kmem_malloc_domainset(
>