From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp05.au.ibm.com", Issuer "Equifax" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id E772AB7B6B for ; Fri, 9 Oct 2009 01:51:51 +1100 (EST) Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [202.81.31.245]) by e23smtp05.au.ibm.com (8.14.3/8.13.1) with ESMTP id n98En5Tw009360 for ; Fri, 9 Oct 2009 01:49:05 +1100 Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id n98Epner1446016 for ; Fri, 9 Oct 2009 01:51:49 +1100 Received: from d23av02.au.ibm.com (loopback [127.0.0.1]) by d23av02.au.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id n98EpntT029718 for ; Fri, 9 Oct 2009 01:51:49 +1100 Message-ID: <4ACDFC83.4080205@in.ibm.com> Date: Thu, 08 Oct 2009 20:21:47 +0530 From: Sachin Sant MIME-Version: 1.0 To: Benjamin Herrenschmidt Subject: [PATCH] Ftrace : fix function_graph tracer OOPS References: <4A5C5D65.3030906@in.ibm.com> <4A76BE81.4080707@in.ibm.com> <1252458303.20985.10.camel@gandalf.stny.rr.com> <4AA74AE2.5090001@in.ibm.com> <1252814877.26049.93.camel@gandalf.stny.rr.com> <1252816650.8375.70.camel@pasglop> <1252848060.26049.647.camel@gandalf.stny.rr.com> <1252873548.8375.73.camel@pasglop> <1252915227.8375.118.camel@pasglop> <1254749155.13160.6.camel@gandalf.stny.rr.com> <1254774039.7122.35.camel@pasglop> <1254775073.13160.13.camel@gandalf.stny.rr.com> <4ACC57C4.5010002@in.ibm.com> <1254906621.2409.1.camel@pasglop> In-Reply-To: <1254906621.2409.1.camel@pasglop> Content-Type: multipart/mixed; boundary="------------080105090805070904020205" Cc: linuxppc-dev@ozlabs.org, rostedt@goodmis.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is a multi-part message in MIME format. --------------080105090805070904020205 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Enabling function graph causes oops due to usage of LOAD_REG_IMMEDIATE(). As explained by Ben the usage of LOAD_REG_IMMEDIATE generates relocs that are not supported when CONFIG_RELOCATABLE is set. Switch to LOAD_REG_ADDR(). Signed-off-by : Sachin Sant --- --------------080105090805070904020205 Content-Type: text/x-patch; name="fix_ftrace_function_graph.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="fix_ftrace_function_graph.patch" Enabling function graph causes oops due to usage of LOAD_REG_IMMEDIATE(). As explained by Ben the usage of LOAD_REG_IMMEDIATE generates relocs that are not supported when CONFIG_RELOCATABLE is set. Switch to LOAD_REG_ADDR(). Signed-off-by : Sachin Sant --- diff -Naurp old/arch/powerpc/kernel/entry_64.S new/arch/powerpc/kernel/entry_64.S --- old/arch/powerpc/kernel/entry_64.S 2009-10-08 18:37:44.000000000 +0530 +++ new/arch/powerpc/kernel/entry_64.S 2009-10-08 18:34:33.000000000 +0530 @@ -1038,8 +1038,8 @@ _GLOBAL(mod_return_to_handler) * We are in a module using the module's TOC. * Switch to our TOC to run inside the core kernel. */ - LOAD_REG_IMMEDIATE(r4,ftrace_return_to_handler) - ld r2, 8(r4) + ld r2, PACATOC(r13) + LOAD_REG_ADDR(r4,ftrace_return_to_handler) bl .ftrace_return_to_handler nop --------------080105090805070904020205--