linux-kernel - Re: [PATCH] arm64: mm: support setting page attributes for debug situation

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Message-ID: <20200116110914.GA16345@willie-the-truck>
Date:   Thu, 16 Jan 2020 11:09:14 +0000
From:   Will Deacon <will@...nel.org>
To:     yeyunfeng <yeyunfeng@...wei.com>
Cc:     catalin.marinas@....com, anshuman.khandual@....com,
        akpm@...ux-foundation.org, willy@...radead.org,
        ard.biesheuvel@....com, tglx@...utronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        hushiyuan@...wei.com, linfeilong@...wei.com
Subject: Re: [PATCH] arm64: mm: support setting page attributes for debug
 situation

On Fri, Jan 10, 2020 at 03:47:41PM +0800, yeyunfeng wrote:
> When rodata_full is set or pagealloc debug is enabled, block mappings or
> contiguou hints are no longer used for linear address area. Therefore,
> support setting page attributes in this case is useful for debugging
> memory corruption problems.
> 
> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
> ---
>  arch/arm64/mm/pageattr.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)

Although I can kind of see what you're getting at, I'm not keen on merging
this without a user. If you're just referring to random debug hacks, then I
think this change could be part of those too.

Will