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Rao" To: Michael Ellerman , Steven Rostedt , Masami Hiramatsu , Ingo Molnar , Nicholas Piggin Cc: , Subject: [PATCH v2 0/7] powerpc/ftrace: Patch out -mprofile-kernel instructions Date: Thu, 27 Jun 2019 16:53:48 +0530 X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19062711-0016-0000-0000-0000028CD918 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19062711-0017-0000-0000-000032EA5657 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-27_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=718 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906270133 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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