linux-kernel - Re: [PATCH v12 4/5] arm64: Implement page table free interfaces

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Message-ID: <20180604150709.GA8593@arm.com>
Date:   Mon, 4 Jun 2018 16:07:10 +0100
From:   Will Deacon <will.deacon@....com>
To:     Chintan Pandya <cpandya@...eaurora.org>
Cc:     catalin.marinas@....com, mark.rutland@....com,
        akpm@...ux-foundation.org, toshi.kani@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 4/5] arm64: Implement page table free interfaces

On Mon, Jun 04, 2018 at 07:13:18PM +0530, Chintan Pandya wrote:
> On 6/4/2018 5:43 PM, Will Deacon wrote:
> >On Fri, Jun 01, 2018 at 06:09:17PM +0530, Chintan Pandya wrote:
> >>+		next = addr;
> >>+		end = addr + PUD_SIZE;
> >>+		do {
> >>+			pmd_free_pte_page(entry, next);
> >>+		} while (entry++, next += PMD_SIZE, next != end);
> >>+
> >>+		pud_clear(pudp);
> >>+		__flush_tlb_kernel_pgtable(addr);
> >>+		pmd_free(NULL, table);
> >>+	}
> >>+	return 1;
> >
> >So with these patches, we only ever return 1 from these helpers. It looks
> >like the same is true for x86, so how about we make them void and move the
> >calls inside the conditionals in lib/ioremap.c? Obviously, this would be a
> >separate patch on the end.
> 
> That sounds valid code churn to me. But since x86 discussion is not
> concluded yet, I would wait to share until that gets resolved. May be
> not in v13 but separate effort. Would that be okay to you ?

Yes, fine by me.

Will