Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754866AbZJZH1E (ORCPT ); Mon, 26 Oct 2009 03:27:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754829AbZJZH1D (ORCPT ); Mon, 26 Oct 2009 03:27:03 -0400 Received: from mail-pz0-f188.google.com ([209.85.222.188]:65469 "EHLO mail-pz0-f188.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754823AbZJZH1B (ORCPT ); Mon, 26 Oct 2009 03:27:01 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:reply-to:to:cc:in-reply-to:references:content-type :organization:date:message-id:mime-version:x-mailer :content-transfer-encoding; b=KKhKuZtKHjiTZmJ2stNWACM7JBzjgZTXrCNGlvDrYmBUKt2j9JVJT5y88u2kp0Duq6 Gc7B20RHcsvp7UeTL7Lgepa4BCcB+8+rmwmedV7/DP8s7MY9qnrutgHVckOQ0Pkr5/ay 6g39wZ8b/VQJfulgFiObjtFayfClfn9+7HIKs= Subject: Re: [PATCH -v5 09/11] tracing: add IRQENTRY_EXIT for MIPS From: Wu Zhangjin Reply-To: wuzhangjin@gmail.com To: Frederic Weisbecker Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, rostedt@goodmis.org, Thomas Gleixner , Ralf Baechle , Nicholas Mc Guire , Richard Sandiford , David Daney , Adam Nemet , Patrik Kluba In-Reply-To: References: <2f73eae542c47ac5bbb9f7280e6c0271d193e90d.1256483735.git.wuzhangjin@gmail.com> <3e0c2d7d8b8f196a8153beb41ea7f3cbf42b3d84.1256483735.git.wuzhangjin@gmail.com> <54c417629e91f40b2bbb4e08cda2a4e6527824c0.1256483735.git.wuzhangjin@gmail.com> <29bccff04932e993ecd9f516d8b6dcf84e2ceecf.1256483735.git.wuzhangjin@gmail.com> <72f2270f7b6e01ca7a4cdf4ac8c21778e5d9652f.1256483735.git.wuzhangjin@gmail.com> <6140dd8f4e1783e5ac30977cf008bb98e4698322.1256483735.git.wuzhangjin@gmail.com> <49b3c441a57f4db423732f81432a3450ccb3240e.1256483735.git.wuzhangjin@gmail.com> <6ad82af0c2ec8ef7b9f536b0a97bf65d385c3945.1256483735.git.wuzhangjin@gmail.com> Content-Type: text/plain Organization: DSLab, Lanzhou University, China Date: Mon, 26 Oct 2009 15:26:40 +0800 Message-Id: <1256542000.5642.118.camel@falcon> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3005 Lines: 94 Hi, On Mon, 2009-10-26 at 01:36 +0100, Frederic Weisbecker wrote: > 2009/10/25 Wu Zhangjin : > > This patch fix the following error with FUNCTION_GRAPH_TRACER=y: > > > > kernel/built-in.o: In function `print_graph_irq': > > trace_functions_graph.c:(.text+0x6dba0): undefined reference to `__irqentry_text_start' > > trace_functions_graph.c:(.text+0x6dba8): undefined reference to `__irqentry_text_start' > > trace_functions_graph.c:(.text+0x6dbd0): undefined reference to `__irqentry_text_end' > > trace_functions_graph.c:(.text+0x6dbd4): undefined reference to `__irqentry_text_end' > > > > (This patch is need to support function graph tracer of MIPS) > > > If you want to enjoy this section, you'd need to tag the > mips irq entry functions with "__irq_entry" :) > > I guess there is a do_IRQ() in mips that is waiting for that (and > probably some others). > The effect is that interrupt areas are cut with a pair of arrows > in the trace, so that you more easily spot interrupts in the traces > > May be I missed this part in another patch in this series though... ooh, Sorry, only this patch added(I stopped after fixing the compiling errors, no more check! so lazy a guy!). Just checked the source code of MIPS, the do_IRQ() is defined as a macro, so, I must move the macro to a C file, and also, there is a irq_enter...irq_exit block in a "big" function, I need to split it out. [...] /* * do_IRQ handles all normal device IRQ's (the special * SMP cross-CPU interrupts have their own specific * handlers). * * Ideally there should be away to get this into kernel/irq/handle.c to * avoid the overhead of a call for just a tiny function ... */ #define do_IRQ(irq) \ do { \ irq_enter(); \ __DO_IRQ_SMTC_HOOK(irq); \ generic_handle_irq(irq); \ irq_exit(); \ } while (0) [...] But The comment told us: do not make this tiny function be a standalone function, so??? the same to do_IRQ_no_affinity. and, about the following function, I need to split the irq_enter()...irq_exit() block out. void ipi_decode(struct smtc_ipi *pipi) { [...] switch (type_copy) { case SMTC_CLOCK_TICK: irq_enter(); kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq)); cd = &per_cpu(mips_clockevent_device, cpu); cd->event_handler(cd); irq_exit(); break; case LINUX_SMP_IPI: switch ((int)arg_copy) { case SMP_RESCHEDULE_YOURSELF: ipi_resched_interrupt(); break; case SMP_CALL_FUNCTION: ipi_call_interrupt(); break; [...] Regards, Wu Zhangjin -- 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/