linux-kernel - Re: [PATCH v5 4/8] x86/mm/tlb: Flush remote and local TLBs concurrently

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Date:   Thu, 18 Feb 2021 08:14:08 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Nadav Amit <namit@...are.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        xen-devel@...ts.xenproject.org,
        Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [PATCH v5 4/8] x86/mm/tlb: Flush remote and local TLBs
 concurrently

Given that the last patch killed the last previously existing
user of on_each_cpu_cond_mask there are now the only users.

>  	if (info->freed_tables) {
> -		smp_call_function_many(cpumask, flush_tlb_func,
> -			       (void *)info, 1);
> +		on_each_cpu_cond_mask(NULL, flush_tlb_func, (void *)info, true,
> +				      cpumask);

.. 

> +		on_each_cpu_cond_mask(NULL, flush_tlb_func, (void *)info, true,
> +				      cpumask);

Which means the cond_func is unused, and thus on_each_cpu_cond_mask can
go away entirely in favor of on_each_cpu_cond.