linux-kernel - Re: [PATCH 2/4] mm: add new mmget() helper

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Date:   Mon, 9 Jan 2017 15:18:08 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vegard Nossum <vegard.nossum@...cle.com>
Cc:     Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        Peter Zijlstra <peterz@...radead.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] mm: add new mmget() helper

On Sun, 18 Dec 2016 13:32:27 +0100 Vegard Nossum <vegard.nossum@...cle.com> wrote:

> Apart from adding the helper function itself, the rest of the kernel is
> converted mechanically using:
> 
>   git grep -l 'atomic_inc.*mm_users' | xargs sed -i 's/atomic_inc(&\(.*\)->mm_users);/mmget\(\1\);/'
>   git grep -l 'atomic_inc.*mm_users' | xargs sed -i 's/atomic_inc(&\(.*\)\.mm_users);/mmget\(\&\1\);/'
> 
> This is needed for a later patch that hooks into the helper, but might be
> a worthwhile cleanup on its own.
>
> ...
>

mmgrap() and mmget() naming is really quite confusing.

> --- a/arch/arc/kernel/smp.c
> +++ b/arch/arc/kernel/smp.c
> @@ -124,7 +124,7 @@ void start_kernel_secondary(void)
>  	/* MMU, Caches, Vector Table, Interrupts etc */
>  	setup_processor();
>  
> -	atomic_inc(&mm->mm_users);
> +	mmget(mm);

I wonder if mmuse() would be a bit clearer than mmget().  Although that
sounds like use_mm().