linux-kernel - user_access_{save,restore}() semantics

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Message-ID: <20200710161527.GA22579@lst.de>
Date:   Fri, 10 Jul 2020 18:15:27 +0200
From:   Christoph Hellwig <hch@....de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org
Subject: user_access_{save,restore}() semantics

Hi Peter,

can you explain (and maybe document while we're at it) what the
exact semantics of the user_access_{save,restore} helpers are?

Reverse engineering from the commit text they seem to be about
saving the current uaccess state.  But do they also enable/disable
anything?