linux-kernel - Re: [PATCH 1/7] mm: allocate mm_cpumask dynamically based on nr_cpu

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Date:   Mon, 16 Jul 2018 00:59:52 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Rik van Riel <riel@...riel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, luto@...nel.org,
        dave.hansen@...el.com, kernel-team@...com, efault@....de,
        tglx@...utronix.de, songliubraving@...com, hpa@...or.com
Subject: Re: [PATCH 1/7] mm: allocate mm_cpumask dynamically based on
 nr_cpu_ids


* Rik van Riel <riel@...riel.com> wrote:

> The mm_struct always contains a cpumask bitmap, regardless of
> CONFIG_CPUMASK_OFFSTACK. That means the first step can be to
> simplify things, and simply have one bitmask at the end of the
> mm_struct for the mm_cpumask.
> 
> This does necessitate moving everything else in mm_struct into
> an anonymous sub-structure, which can be randomized when struct
> randomization is enabled.
> 
> The second step is to determine the correct size for the
> mm_struct slab object from the size of the mm_struct
> (excluding the cpu bitmap) and the size the cpumask.
> 
> For init_mm we can simply allocate the maximum size this
> kernel is compiled for, since we only have one init_mm
> in the system, anyway.
> 
> Pointer magic by Mike Galbraith, to evade -Wstringop-overflow
> getting confused by the dynamically sized array.
> 
> Signed-off-by: Rik van Riel <riel@...riel.com>
> Signed-off-by: Mike Galbraith <efault@....de>

Is this an Acked-by in disguise, or did this patch route via Mike?

Thanks,

	Ingo