linux-kernel - [RFC PATCH 00/14] powerpc64: Add support for ftrace direct calls

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Message-Id: <cover.1606412433.git.naveen.n.rao@linux.vnet.ibm.com>
Date:   Thu, 26 Nov 2020 23:38:37 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: [RFC PATCH 00/14] powerpc64: Add support for ftrace direct calls

This series adds support for DYNAMIC_FTRACE_WITH_DIRECT_CALLS for 
powerpc64le.

This is mostly working fine for me, except for a soft lockup I see with 
the ftrace direct selftest. It happens when irqsoff tracer is being 
tested with the ftrace direct modules. This appears to be an existing 
upstream issue since I am able to reproduce the lockup without these 
patches. I will be looking into that to see if I can figure out the 
cause of those lockups.

In the meantime, I would appreciate a review of these patches.


- Naveen


Naveen N. Rao (14):
  ftrace: Fix updating FTRACE_FL_TRAMP
  ftrace: Fix DYNAMIC_FTRACE_WITH_DIRECT_CALLS dependency
  ftrace: Fix cleanup in error path of register_ftrace_direct()
  ftrace: Remove ftrace_find_direct_func()
  ftrace: Add architectural helpers for [un]register_ftrace_direct()
  powerpc: Add support for CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
  powerpc/ftrace: Remove dead code
  powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace
    trampoline
  powerpc/ftrace: Use a hash table for tracking ftrace stubs
  powerpc/ftrace: Drop assumptions about ftrace trampoline target
  powerpc/ftrace: Use GPR save/restore macros in ftrace_graph_caller()
  powerpc/ftrace: Drop saving LR to stack save area for -mprofile-kernel
  powerpc/ftrace: Add support for register_ftrace_direct() for
    MPROFILE_KERNEL
  samples/ftrace: Add powerpc support for ftrace direct samples

 arch/powerpc/Kconfig                          |   2 +
 arch/powerpc/include/asm/ftrace.h             |  14 +
 arch/powerpc/include/asm/ptrace.h             |  31 ++
 arch/powerpc/kernel/trace/ftrace.c            | 314 +++++++++++++-----
 .../powerpc/kernel/trace/ftrace_64_mprofile.S |  70 ++--
 include/linux/ftrace.h                        |   7 +-
 kernel/trace/Kconfig                          |   2 +-
 kernel/trace/ftrace.c                         | 130 +++-----
 samples/Kconfig                               |   2 +-
 samples/ftrace/ftrace-direct-modify.c         |  58 ++++
 samples/ftrace/ftrace-direct-too.c            |  48 ++-
 samples/ftrace/ftrace-direct.c                |  45 ++-
 12 files changed, 519 insertions(+), 204 deletions(-)


base-commit: 4c202167192a77481310a3cacae9f12618b92216
-- 
2.25.4