Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754591AbbFCNWX (ORCPT ); Wed, 3 Jun 2015 09:22:23 -0400 Received: from verein.lst.de ([213.95.11.211]:52512 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753431AbbFCNWQ (ORCPT ); Wed, 3 Jun 2015 09:22:16 -0400 Date: Wed, 3 Jun 2015 15:22:14 +0200 From: Torsten Duwe To: Michael Ellerman , ppc-dev Cc: Jiri Kosina , Steven Rostedt , linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] ppc64 ftrace recursion protection Message-ID: <20150603132214.GE19424@lst.de> References: <20150513161100.GA1619@lst.de> <1431653687.13498.1.camel@ellerman.id.au> <20150515084542.GA20453@suse.de> <20150516080534.GA27059@lst.de> <1432006027.8339.3.camel@ellerman.id.au> <20150603130257.GA19424@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150603130257.GA19424@lst.de> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1964 Lines: 59 As suggested by You and Jikos, a flag in task_struct's trace_recursion is used to block a tracer function to recurse into itself, especially on a data access fault. This should catch all functions called by the fault handlers which are not yet attributed notrace. Signed-off-by: Torsten Duwe diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 4717859..ae10752 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -72,6 +72,7 @@ int main(void) DEFINE(THREAD, offsetof(struct task_struct, thread)); DEFINE(MM, offsetof(struct task_struct, mm)); DEFINE(MMCONTEXTID, offsetof(struct mm_struct, context.id)); + DEFINE(TASK_TRACEREC, offsetof(struct task_struct, trace_recursion)); #ifdef CONFIG_PPC64 DEFINE(AUDITCONTEXT, offsetof(struct task_struct, audit_context)); DEFINE(SIGSEGV, SIGSEGV); diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index a4132ef..4768104 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -1202,7 +1202,13 @@ _GLOBAL(ftrace_caller) SAVE_8GPRS(16,r1) SAVE_8GPRS(24,r1) - + ld r3, PACACURRENT(r13) + ld r4, TASK_TRACEREC(r3) + andi. r5, r4, 0x0010 // ( 1 << TRACE_FTRACE_BIT ) + ori r4, r4, 0x0010 + std r4, TASK_TRACEREC(r3) + bne 3f // ftrace in progress - avoid recursion! + LOAD_REG_IMMEDIATE(r3,function_trace_op) ld r5,0(r3) @@ -1224,9 +1230,14 @@ ftrace_call: bl ftrace_stub nop + ld r3, PACACURRENT(r13) + ld r4, TASK_TRACEREC(r3) + andi. r4, r4, 0xffef // ~( 1 << TRACE_FTRACE_BIT ) + std r4, TASK_TRACEREC(r3) + ld r3, _NIP(r1) mtlr r3 - +3: REST_8GPRS(0,r1) REST_8GPRS(8,r1) REST_8GPRS(16,r1) -- 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/