linux-kernel - Re: [PATCH v14 19/22] mm: Add generic ptdump

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Message-ID: <20191030164812.GD13309@arrakis.emea.arm.com>
Date:   Wed, 30 Oct 2019 16:48:13 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Steven Price <steven.price@....com>
Cc:     linux-mm@...ck.org, Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        James Morse <james.morse@....com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Rutland <Mark.Rutland@....com>,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v14 19/22] mm: Add generic ptdump

On Mon, Oct 28, 2019 at 01:59:07PM +0000, Steven Price wrote:
> +struct ptdump_state {
> +	void (*note_page)(struct ptdump_state *st, unsigned long addr,
> +			  int level, unsigned long val);
> +	const struct ptdump_range *range;
> +};

It would be nice to have a comment above note_page about what 'level'
actually means...

[...]
> +static int ptdump_hole(unsigned long addr, unsigned long next,
> +		       int depth, struct mm_walk *walk)
> +{
> +	struct ptdump_state *st = walk->private;
> +
> +	st->note_page(st, addr, depth + 1, 0);

... as it took me a while to figure out why you 'depth + 1' here.

But see my other reply on the arm64 patch. Is it possible to align depth
and level here to have the same range?

-- 
Catalin