Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759154Ab3CGWcy (ORCPT ); Thu, 7 Mar 2013 17:32:54 -0500 Received: from ozlabs.org ([203.10.76.45]:46083 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752244Ab3CGWcx (ORCPT ); Thu, 7 Mar 2013 17:32:53 -0500 From: Michael Neuling To: Philippe De Muyter cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: 3.9-rc1 powerpc ptrace.c: 'brk.len' is used uninitialized In-reply-to: <20130307095907.GA16489@frolo.macqel> References: <20130306060058.GA3106@frolo.macqel> <21084.1362607788@ale.ozlabs.ibm.com> <20130306223645.GA15484@frolo.macqel> <31862.1362611670@ale.ozlabs.ibm.com> <20130307095907.GA16489@frolo.macqel> Comments: In-reply-to Philippe De Muyter message dated "Thu, 07 Mar 2013 10:59:07 +0100." X-Mailer: MH-E 8.2; nmh 1.5; GNU Emacs 23.4.1 Date: Fri, 08 Mar 2013 09:32:51 +1100 Message-ID: <22285.1362695571@ale.ozlabs.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2753 Lines: 76 Philippe De Muyter wrote: > Hello Mikey, > > On Thu, Mar 07, 2013 at 10:14:30AM +1100, Michael Neuling wrote: > > Philippe De Muyter wrote: > > > > > On Thu, Mar 07, 2013 at 09:09:48AM +1100, Michael Neuling wrote: > > > > > bisect tells me that since your commit 9422de3e953d0e60eb95f5430a9dd803eec1c6d7 > > > > > "powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers", > > > > > compiling linux fails with : > > > > > > > > > > cc1: warnings being treated as errors > > > > > arch/powerpc/kernel/ptrace.c: In function 'arch_ptrace': > > > > > arch/powerpc/kernel/ptrace.c:1450: warning: 'brk.len' is used uninitialized in this function > > > > > arch/powerpc/kernel/ptrace.c:1352: note: 'brk.len' was declared here > > > > > > > > > > could you look at that ? > > > > > > > > Sure. > > > > > > I use gcc-4.2.2, and my .config follows. > > > > I'm a bit lost. > > > > I don't have 4.2.2 (which is ancient BTW) and I can't hit this on > > 4.3,4.5 or 4.6 with your config. It compiles fine. > > > > Also: > > > > > arch/powerpc/kernel/ptrace.c:1450: warning: 'brk.len' is used uninitialized in this function > > > arch/powerpc/kernel/ptrace.c:1352: note: 'brk.len' was declared here > > > > These line numbers make no sense at all WRT v3.9-rc1. brk.len is neither > > declared or used in those lines: > > those were the line numbers just after your commit > > In 3.9-rc1 they are : > > cc1: warnings being treated as errors > arch/powerpc/kernel/ptrace.c: In function 'arch_ptrace': > arch/powerpc/kernel/ptrace.c:1479: warning: 'brk.len' is used uninitialized in this function > arch/powerpc/kernel/ptrace.c:1381: note: 'brk.len' was declared here > > if (child->thread.hw_brk.address) > return -ENOSPC; > > 1479: child->thread.hw_brk = brk; > > return 1; > #endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */ Got it. I still can't replicate the issue here, so can you check if the below works for you? Thanks, Mikey diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index 245c1b6..3b5f9dc 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -1428,6 +1428,7 @@ static long ppc_set_hwdebug(struct task_struct *child, brk.address = bp_info->addr & ~7UL; brk.type = HW_BRK_TYPE_TRANSLATE; + brk.len = len; if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ) brk.type |= HW_BRK_TYPE_READ; if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/