linux-kernel - Re: kmap_local semantics

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Date:   Thu, 18 Mar 2021 05:36:56 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: Re: kmap_local semantics

On Wed, Mar 17, 2021 at 07:44:20PM -0700, Ira Weiny wrote:
> Agreed.  I'm Sorry, I did not word the above clearly enough.  Let me rephrase
> that.
> 
> Christoph, do you anticipate additional need to call kmap and hand the mappings
> to other threads?  If not then kmap_local is what you should use.  If so, I'd
> like to know why.

No.  Just looking into callers that want a mapping and then synchronously
wait for I/O.