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Date:   Sun, 22 Nov 2020 13:33:04 +0000
From:   David Howells <>
To:     Linus Torvalds <>
Cc:, Pavel Begunkov <>,
        Matthew Wilcox <>,
        Jens Axboe <>,
        Alexander Viro <>,
        linux-fsdevel <>,
        linux-block <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH 01/29] iov_iter: Switch to using a table of operations

Linus Torvalds <> wrote:

>  - I worry a bit about the indirect call overhead and spectre v2.

I don't know enough about how spectre v2 works to say if this would be a
problem for the ops-table approach, but wouldn't it also affect the chain of
conditional branches that we currently use, since it's branch-prediction


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