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Date: Sun, 22 Nov 2020 13:33:04 +0000 From: David Howells <dhowells@...hat.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: dhowells@...hat.com, Pavel Begunkov <asml.silence@...il.com>, Matthew Wilcox <willy@...radead.org>, Jens Axboe <axboe@...nel.dk>, Alexander Viro <viro@...iv.linux.org.uk>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-block <linux-block@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 01/29] iov_iter: Switch to using a table of operations Linus Torvalds <torvalds@...ux-foundation.org> 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 based? David
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