linux-kernel - [RFC][PATCH 0/6] objtool: Optimize !retpoline

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Message-ID: <20210219204300.749932493@infradead.org>
Date:   Fri, 19 Feb 2021 21:43:00 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     jpoimboe@...hat.com, x86@...nel.org, pjt@...gle.com,
        mbenes@...e.cz, jgross@...e.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [RFC][PATCH 0/6] objtool: Optimize !retpoline

Hi,

Here's a few patches that go on top of the previously posted series:

  https://lkml.kernel.org/r/20210211173044.141215027@infradead.org
  https://lkml.kernel.org/r/20210218165938.213678824@infradead.org

and can also be found, in full, here:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git objtool/wip

The purpose is to replace every compiler generated (tail) call to the retpoline
thunks with an alternative, one that avoids the thunk when retpolines are
disabled.

Very lightly tested...