linux-kernel - Re: [RFC][PATCH 01/11] asm-generic/tlb: Provide a comment

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Message-ID: <20180913123937.GX24124@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Sep 2018 14:39:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:     will.deacon@....com, 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 01/11] asm-generic/tlb: Provide a comment

On Thu, Sep 13, 2018 at 02:18:27PM +0200, Martin Schwidefsky wrote:
> We may get something working with a common code mmu_gather, but I fear the
> day someone makes a "minor" change to that subtly break s390. The debugging of
> TLB related problems is just horrible..

Yes it is, not just on s390 :/

And this is not something that's easy to write sanity checks for either
AFAIK. I mean we can do a few multi-threaded mmap()/mprotect()/munmap()
proglets and catch faults, but that doesn't even get close to covering
all the 'fun' spots.

Then again, you're more than welcome to the new:

  MMU GATHER AND TLB INVALIDATION

section in MAINTAINERS.