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Date:   Fri, 14 Feb 2020 13:00:31 -0800
From:   Mina Almasry <almasrymina@...gle.com>
To:     linux-mm@...ck.org, linux-next@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Cc:     David Rientjes <rientjes@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hugetlb: fix CONFIG_CGROUP_HUGETLB ifdefs

On Fri, Feb 14, 2020 at 12:46 PM Mina Almasry <almasrymina@...gle.com> wrote:
>
> Fixes an #ifdef bug in the patch referred to below that was
> causing a build error when CONFIG_DEBUG_VM &&
> !CONFIG_CCGROUP_HUGETLB.
>
> Fixes: b5f16a533ce8a ("hugetlb: support file_region coalescing again")
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Greg Thelen <gthelen@...gle.com>
> Cc: Mike Kravetz <mike.kravetz@...cle.com>
> Cc: Shakeel Butt <shakeelb@...gle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  mm/hugetlb.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index ee6d262fe6ac0..95d34c58981d2 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -289,7 +289,7 @@ static bool has_same_uncharge_info(struct file_region *rg,
>  #endif
>  }
>
> -#ifdef CONFIG_DEBUG_VM
> +#if defined(CONFIG_DEBUG_VM) && defined(CONFIG_CGROUP_HUGETLB)
>  static void dump_resv_map(struct resv_map *resv)
>  {
>         struct list_head *head = &resv->regions;
> @@ -325,6 +325,10 @@ static void check_coalesce_bug(struct resv_map *resv)
>                 }
>         }
>  }
> +#else
> +static void check_coalesce_bug(struct resv_map *resv)
> +{
> +}
>  #endif
>
>  static void coalesce_file_region(struct resv_map *resv, struct file_region *rg)
> @@ -431,9 +435,7 @@ static long add_reservation_in_range(struct resv_map *resv, long f, long t,
>         }
>
>         VM_BUG_ON(add < 0);
> -#ifdef CONFIG_DEBUG_VM
>         check_coalesce_bug(resv);
> -#endif
>         return add;
>  }
>
> --
> 2.25.0.265.gbab2e86ba0-goog

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