linux-kernel - [PATCH 0/4] munmap() vs unmap_mapping

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Message-ID: <20220708071802.751003711@infradead.org>
Date:   Fri, 08 Jul 2022 09:18:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jann Horn <jannh@...gle.com>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        peterz@...radead.org, Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guo Ren <guoren@...nel.org>, David Miller <davem@...emloft.net>
Subject: [PATCH 0/4] munmap() vs unmap_mapping_range()

Hi,

These 4 patches implement the suggestion by Linus.

The first patch nukes all architecture implementations of tlb_{start,end}_vma()
by adding two additional MMU_GATHER config knobs.

DaveM, please clarify the sparc64 case, it seems a little odd to have
flush_cache_range() but to explicitly not call it at unmap time. It would be
nice to remove this one special case.

The second patch isn't strictly needed for this series but since I was looking
at all this, I figured C-SKY didn't make a whole lot of sense. Guo, please
have a look.

The third patch cleans up the #ifdeffery and provides a single
tlb_{start,end}_vma() implementation for everyone.

The fourth, and final, patch does the force TLB-flush on VM_PFNMAP thing.

I've had the first three patches exposed to the robots and they've (so far) not
reported build (or other) fail.