linux-kernel - Re: [PATCH] mm/highmem: Fix CONFIG_DEBUG_KMAP_LOCAL_FORCE

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Date:   Fri, 19 Mar 2021 03:14:03 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     ira.weiny@...el.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Oliver Sang <oliver.sang@...el.com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        David Sterba <dsterba@...e.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/highmem: Fix CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP

On Thu, Mar 18 2021 at 16:06, ira weiny wrote:
> From: Ira Weiny <ira.weiny@...el.com>
>
> The kernel test robot found that __kmap_local_sched_out() was not
> correctly skipping the guard pages when
> CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP was set.[1]  This was due to
> CONFIG_DEBUG_HIGHMEM check being used.
>
> Change the configuration check to be correct.
>
> [1] https://lore.kernel.org/lkml/20210304083825.GB17830@xsang-OptiPlex-9020/
>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Oliver Sang <oliver.sang@...el.com>
> Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
> Cc: David Sterba <dsterba@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Fixes: 0e91a0c6984c ("mm/highmem: Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP")
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org

Thanks,

        tglx