linux-kernel - Re: [PATCH v2 2/6] MIPS: tlb-r4k: If there are wired entries, don't use TLBINVF

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Message-ID: <20160922121136.GA12981@linux-mips.org>
Date:   Thu, 22 Sep 2016 14:11:37 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Matt Redfearn <matt.redfearn@...tec.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-mips@...ux-mips.org, linux-remoteproc@...r.kernel.org,
        lisa.parratt@...tec.com, linux-kernel@...r.kernel.org,
        Hugh Dickins <hughd@...gle.com>,
        Huacai Chen <chenhc@...ote.com>,
        "David S. Miller" <davem@...emloft.net>,
        James Hogan <james.hogan@...tec.com>,
        Paul Burton <paul.burton@...tec.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 2/6] MIPS: tlb-r4k: If there are wired entries, don't
 use TLBINVF

On Tue, Sep 20, 2016 at 09:47:25AM +0100, Matt Redfearn wrote:

> When adding a wired entry to the TLB via add_wired_entry, the tlb is
> flushed with local_flush_tlb_all, which on CPUs with TLBINV results in
> the new wired entry being flushed again.
> 
> Behavior of the TLBINV instruction applies to all applicable TLB entries
> and is unaffected by the setting of the Wired register. Therefore if
> the TLB has any wired entries, fall back to iterating over the entries
> rather than blasting them all using TLBINVF.
> 
> Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>

Queued for 4.9..

  Ralf