From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>
Cc: <linuxppc-dev@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 0/7] powerpc/ftrace: Patch out -mprofile-kernel instructions
Date: Thu, 27 Jun 2019 16:53:48 +0530 [thread overview]
Message-ID: <cover.1561634177.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
Changes since v1
(https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=114556):
- Patches 1,2,3 and 6: No changes
- Patch 4: Add smp_call_function() to flush icache on all cpus after
patching in the 'mflr r0' instruction.
- Patch 5: Changes as per Steven Rostedt's suggestions.
- Patch 7: Changes as per Masami and Joe Perches.
--
On powerpc64, -mprofile-kernel results in two instructions being
emitted: 'mflr r0' and 'bl _mcount'. So far, we were only nop'ing out
the branch to _mcount(). This series implements an approach to also nop
out the preceding mflr.
- Naveen
Naveen N. Rao (7):
ftrace: Expose flags used for ftrace_replace_code()
x86/ftrace: Fix use of flags in ftrace_replace_code()
ftrace: Expose __ftrace_replace_code()
powerpc/ftrace: Additionally nop out the preceding mflr with
-mprofile-kernel
ftrace: Update ftrace_location() for powerpc -mprofile-kernel
kprobes/ftrace: Use ftrace_location() when [dis]arming probes
powerpc/kprobes: Allow probing on any ftrace address
arch/powerpc/include/asm/ftrace.h | 8 +
arch/powerpc/kernel/kprobes-ftrace.c | 32 +++-
arch/powerpc/kernel/trace/ftrace.c | 258 ++++++++++++++++++++++++---
arch/x86/kernel/ftrace.c | 3 +-
include/linux/ftrace.h | 15 ++
kernel/kprobes.c | 10 +-
kernel/trace/ftrace.c | 15 +-
7 files changed, 302 insertions(+), 39 deletions(-)
--
2.22.0
next reply other threads:[~2019-06-27 11:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-27 11:23 Naveen N. Rao [this message]
2019-06-27 11:23 ` [PATCH v2 1/7] ftrace: Expose flags used for ftrace_replace_code() Naveen N. Rao
2022-02-23 12:13 ` Christophe Leroy
2022-03-02 16:54 ` Naveen N. Rao
2019-06-27 11:23 ` [PATCH v2 2/7] x86/ftrace: Fix use of flags in ftrace_replace_code() Naveen N. Rao
[not found] ` <abc56ad177f370ec423edcfc538d35b418c1808e.1561634177.git.naveen.n.rao@linux.v net.ibm.com>
2019-06-27 11:27 ` Naveen N. Rao
2019-06-27 13:29 ` Steven Rostedt
2019-06-27 14:49 ` Naveen N. Rao
2019-06-27 11:23 ` [PATCH v2 3/7] ftrace: Expose __ftrace_replace_code() Naveen N. Rao
2019-06-27 14:36 ` Steven Rostedt
2019-06-27 11:23 ` [PATCH v2 4/7] powerpc/ftrace: Additionally nop out the preceding mflr with -mprofile-kernel Naveen N. Rao
[not found] ` <841386feda429a1f0d4b7442c3ede1ed91466f92.1561634177.git.naveen.n.rao@linux.v net.ibm.com>
2019-06-27 14:50 ` Naveen N. Rao
2019-06-27 15:08 ` Steven Rostedt
2019-06-27 15:28 ` Naveen N. Rao
2019-06-27 16:13 ` Steven Rostedt
2019-07-01 8:51 ` Naveen N. Rao
2019-06-28 7:01 ` Nicholas Piggin
2019-06-27 11:23 ` [PATCH v2 5/7] ftrace: Update ftrace_location() for powerpc -mprofile-kernel Naveen N. Rao
2019-06-27 11:23 ` [PATCH v2 6/7] kprobes/ftrace: Use ftrace_location() when [dis]arming probes Naveen N. Rao
2019-06-27 11:23 ` [PATCH v2 7/7] powerpc/kprobes: Allow probing on any ftrace address Naveen N. Rao
2019-06-27 14:19 ` Masami Hiramatsu
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