linux-kernel - [PATCH 0/3] Rewrite x86/ftrace to use text

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Message-Id: <20190827180622.159326993@infradead.org>
Date:   Tue, 27 Aug 2019 20:06:22 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     linux-kernel@...r.kernel.org, x86@...nel.org, peterz@...radead.org
Cc:     Nadav Amit <nadav.amit@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: [PATCH 0/3] Rewrite x86/ftrace to use text_poke()

Ftrace was one of the last W^X violators; these patches move it over to the
generic text_poke() interface and thereby get rid of this oddity.

The first patch has been posted before and was/is part of my (in-progress)
static_call and jump_label/jmp8 patch series; but is equally needed here.

The second patch cleans up the text_poke batching code, and the third converts
ftrace.

---
 arch/x86/include/asm/ftrace.h        |   2 -
 arch/x86/include/asm/text-patching.h |  28 +-
 arch/x86/kernel/alternative.c        | 156 +++++++--
 arch/x86/kernel/ftrace.c             | 620 +++++------------------------------
 arch/x86/kernel/jump_label.c         |  83 ++---
 arch/x86/kernel/kprobes/opt.c        |  11 +-
 arch/x86/kernel/traps.c              |   9 -
 7 files changed, 261 insertions(+), 648 deletions(-)