From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 405mcj4FG1zDrSP for ; Wed, 21 Mar 2018 21:43:49 +1100 (AEDT) Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w2LAhkTd145279 for ; Wed, 21 Mar 2018 06:43:46 -0400 Received: from e06smtp11.uk.ibm.com (e06smtp11.uk.ibm.com [195.75.94.107]) by mx0a-001b2d01.pphosted.com with ESMTP id 2gumf0krff-1 (version=TLSv1.2 cipher=AES256-SHA256 bits=256 verify=NOT) for ; Wed, 21 Mar 2018 06:43:45 -0400 Received: from localhost by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 21 Mar 2018 10:43:37 -0000 From: "Naveen N. Rao" To: Michael Ellerman , Steven Rostedt , Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org, Anton Blanchard , Nicholas Piggin , sathnaga@linux.vnet.ibm.com Subject: [PATCH v2 0/5] powerpc/ftrace: Add support for ftrace_modify_call() and a few other fixes Date: Wed, 21 Mar 2018 16:13:17 +0530 Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The first two patches fix a kernel oops when function tracing is enabled while using KVM and are v2 of the patches posted at: https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg130548.html Patch 3 is a new patch that tightens how we detect _mcount() call sites for -mprofile-kernel during module loading. The last two patches implement support for ftrace_caller() to conditionally save the register state. The existing ftrace_caller() is renamed to ftrace_regs_caller() since we save the entire pt_regs today. A new implementation of ftrace_caller() that saves the minimum register state is provided. We switch between the two variants through ftrace_modify_call(). The necessary support to call into the two different variants from modules is also added. - Naveen Naveen N. Rao (5): powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths powerpc64/ftrace: Disable ftrace during kvm guest entry/exit powerpc64/module: Tighten detection of mcount call sites with -mprofile-kernel powerpc64/ftrace: Use the generic version of ftrace_replace_code() powerpc64/ftrace: Implement support for ftrace_regs_caller() arch/powerpc/include/asm/ftrace.h | 2 - arch/powerpc/include/asm/module.h | 3 + arch/powerpc/include/asm/paca.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/module_64.c | 43 +++-- arch/powerpc/kernel/trace/ftrace.c | 210 ++++++++++++++++++++----- arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 85 +++++++++- arch/powerpc/kernel/trace/ftrace_64_pg.S | 4 + arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 + 9 files changed, 294 insertions(+), 63 deletions(-) -- 2.16.2