linux-kernel - Re: [PATCH v2 1/4] RISC-V: Fix ioremap_cache() and ioremap

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Date:   Wed, 28 Sep 2022 05:14:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     apatel@...tanamicro.com, Paul Walmsley <paul.walmsley@...ive.com>,
        atishp@...shpatra.org, heiko@...ech.de, anup@...infault.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mchitale@...tanamicro.com
Subject: Re: [PATCH v2 1/4] RISC-V: Fix ioremap_cache() and ioremap_wc() for
 systems with Svpbmt

On Thu, Sep 22, 2022 at 09:35:56AM -0700, Palmer Dabbelt wrote:
> Sorry I missed this, I thought it was just part of the rest of this patch
> set.  That said, I'm not actually sure this is a critical fix: sure it's a
> performance problem, and if some driver is expecting ioremap_cache() to go
> fast then possibly a pretty big one, but the only Svpmbt hardware that

More importantly nothing should be using ioremap_cache at all.  It is
an API that has long been deprecated in favor of memremap.