linux-kernel - [PATCH 0/3] ARM: Implement MODULE

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Date:   Fri, 23 Feb 2018 17:58:46 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...ia.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Steven Miao <realmz6@...il.com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        James Hogan <jhogan@...nel.org>,
        Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        adi-buildroot-devel@...ts.sourceforge.net,
        linux-ia64@...r.kernel.org, linux-metag@...r.kernel.org,
        linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org
Subject: [PATCH 0/3] ARM: Implement MODULE_PLT support in FTRACE

FTRACE's function tracer currently doesn't always work on ARM with
MODULE_PLT option enabled. If the module is loaded too far, FTRACE's
code modifier cannot cope with introduced veneers and turns the
function tracer off globally.

ARM64 already has a solution for the problem, refer to the following
patches:

arm64: ftrace: emit ftrace-mod.o contents through code
arm64: module-plts: factor out PLT generation code for ftrace
arm64: ftrace: fix !CONFIG_ARM64_MODULE_PLTS kernels
arm64: ftrace: fix building without CONFIG_MODULES
arm64: ftrace: add support for far branches to dynamic ftrace
arm64: ftrace: don't validate branch via PLT in ftrace_make_nop()

But the presented ARM variant has just a half of the footprint in terms of
the changed LoCs. It also retains the code validation-before-modification
instead of switching it off.

Alexander Sverdlin (3):
  ftrace: Add module to ftrace_make_call() parameters
  ARM: PLT: Move struct plt_entries definition to header
  ftrace: Add MODULE_PLTS support

 arch/arm/include/asm/module.h      | 10 ++++++
 arch/arm/kernel/ftrace.c           | 73 ++++++++++++++++++++++++++++++++------
 arch/arm/kernel/module-plts.c      | 58 +++++++++++++++++++-----------
 arch/arm64/kernel/ftrace.c         |  3 +-
 arch/blackfin/kernel/ftrace.c      |  3 +-
 arch/ia64/kernel/ftrace.c          |  3 +-
 arch/metag/kernel/ftrace.c         |  3 +-
 arch/microblaze/kernel/ftrace.c    |  3 +-
 arch/mips/kernel/ftrace.c          |  3 +-
 arch/powerpc/kernel/trace/ftrace.c |  3 +-
 arch/s390/kernel/ftrace.c          |  3 +-
 arch/sh/kernel/ftrace.c            |  3 +-
 arch/sparc/kernel/ftrace.c         |  3 +-
 arch/tile/kernel/ftrace.c          |  3 +-
 arch/x86/kernel/ftrace.c           |  3 +-
 include/linux/ftrace.h             |  4 ++-
 kernel/trace/ftrace.c              |  6 ++--
 17 files changed, 140 insertions(+), 47 deletions(-)

-- 
2.4.6