linux-kernel - Re: [mmots] build error: mm: prevent racy access to tlb_flush

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Date:   Thu, 27 Jul 2017 15:18:02 +0000
From:   Nadav Amit <namit@...are.com>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Minchan Kim <minchan@...nel.org>
CC:     Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [mmots] build error: mm: prevent racy access to tlb_flush_pending

Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:

> Hello,
> 
> 8c636138f497b36ae95f ("mm: prevent racy access to tlb_flush_pending") kills
> the build
> 
> kernel/fork.c: In function ‘mm_init’:
> kernel/fork.c:810:18: error: ‘struct mm_struct’ has no member named ‘tlb_flush_pending’; did you mean ‘tlb_flush_batched’?
>  atomic_set(&mm->tlb_flush_pending, 0);
>                  ^~~~~~~~~~~~~~~~~
>                  tlb_flush_batched
> 
> 
> 
> replacing clear_tlb_flush_pending() with a direct ->tlb_flush_pending
> access
> 
> @@ -807,7 +807,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
>        mm_init_aio(mm);
>        mm_init_owner(mm, p);
>        mmu_notifier_mm_init(mm);
> -       clear_tlb_flush_pending(mm);
> +       atomic_set(&mm->tlb_flush_pending, 0);
> 
> 
> doesn't work on on !CONFIG_NUMA_BALANCING && !CONFIG_COMPACTION systems.
> 
> 	-ss

Missed this one. Thanks, I will fix it for v3.

When Minchan repurpose this field, he should remove all of these defines
(including those in mm_types.h).

Minchan, do you want me to do it?

Nadav