netdev - Re: [PATCH] net: Revert "net: optimize the sockptr_t for unified kernel/user address spaces"

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Message-Id: <20200810.120739.1883274758298088684.davem@davemloft.net>
Date:   Mon, 10 Aug 2020 12:07:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hch@....de
Cc:     kuba@...nel.org, netdev@...r.kernel.org, bpf@...r.kernel.org,
        edumazet@...gle.com, john.stultz@...aro.org
Subject: Re: [PATCH] net: Revert "net: optimize the sockptr_t for unified
 kernel/user address spaces"

From: Christoph Hellwig <hch@....de>
Date: Mon, 10 Aug 2020 18:42:14 +0200

> This reverts commits 6d04fe15f78acdf8e32329e208552e226f7a8ae6 and
> a31edb2059ed4e498f9aa8230c734b59d0ad797a.
> 
> It turns out the idea to share a single pointer for both kernel and user
> space address causes various kinds of problems.  So use the slightly less
> optimal version that uses an extra bit, but which is guaranteed to be safe
> everywhere.
> 
> Fixes: 6d04fe15f78a ("net: optimize the sockptr_t for unified kernel/user address spaces")
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: John Stultz <john.stultz@...aro.org>
> Signed-off-by: Christoph Hellwig <hch@....de>

Applied, thanks.