linux-kernel - Re: [RFC][PATCH 07/11] arm/tlb: Convert to generic mmu

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Message-ID: <20180919113033.GB24124@hirez.programming.kicks-ass.net>
Date:   Wed, 19 Sep 2018 13:30:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will.deacon@....com>
Cc:     aneesh.kumar@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        npiggin@...il.com, linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux@...linux.org.uk,
        heiko.carstens@...ibm.com
Subject: Re: [RFC][PATCH 07/11] arm/tlb: Convert to generic mmu_gather

On Tue, Sep 18, 2018 at 03:10:34PM +0100, Will Deacon wrote:
> > +	addr = (addr & PMD_MASK) + SZ_1M;
> > +	__tlb_adjust_range(tlb, addr - PAGE_SIZE, addr + PAGE_SIZE);
> 
> Hmm, I don't think you've got the range correct here. Don't we want
> something like:
> 
> 	__tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE)
> 
> to ensure that we flush on both sides of the 1M boundary?

Argh indeed. I confused {start,size} with {start,end}. Thanks!