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Subject: Re: [RFC 01/20] mm/tlb: fix fullmm semantics
From:   Nadav Amit <nadav.amit@gmail.com>
In-Reply-To: <CALCETrXsbaHJ+riUjWUJyrAaSyoFmRs17q=6ytf3vC2uYNL0sQ@mail.gmail.com>
Date:   Sat, 30 Jan 2021 17:19:36 -0800
Cc:     Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <will@kernel.org>, Yu Zhao <yuzhao@google.com>,
        Nick Piggin <npiggin@gmail.com>, X86 ML <x86@kernel.org>
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References: <20210131001132.3368247-1-namit@vmware.com>
 <20210131001132.3368247-2-namit@vmware.com>
 <CALCETrXsbaHJ+riUjWUJyrAaSyoFmRs17q=6ytf3vC2uYNL0sQ@mail.gmail.com>
To:     Andy Lutomirski <luto@kernel.org>
Precedence: bulk

> On Jan 30, 2021, at 5:02 PM, Andy Lutomirski <luto@kernel.org> wrote:
> 
> On Sat, Jan 30, 2021 at 4:16 PM Nadav Amit <nadav.amit@gmail.com> wrote:
>> From: Nadav Amit <namit@vmware.com>
>> 
>> fullmm in mmu_gather is supposed to indicate that the mm is torn-down
>> (e.g., on process exit) and can therefore allow certain optimizations.
>> However, tlb_finish_mmu() sets fullmm, when in fact it want to say that
>> the TLB should be fully flushed.
> 
> Maybe also rename fullmm?

Possible. How about mm_torn_down?

I should have also changed the comment in tlb_finish_mmu().