From patchwork Tue Nov 27 17:38:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 10701115 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A1CE413AD for ; Tue, 27 Nov 2018 17:39:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 874452C139 for ; Tue, 27 Nov 2018 17:39:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7B2222C69C; Tue, 27 Nov 2018 17:39:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 387942C139 for ; Tue, 27 Nov 2018 17:39:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731903AbeK1Eha (ORCPT ); Tue, 27 Nov 2018 23:37:30 -0500 Received: from mail-pl1-f194.google.com ([209.85.214.194]:34077 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731897AbeK1Eha (ORCPT ); Tue, 27 Nov 2018 23:37:30 -0500 Received: by mail-pl1-f194.google.com with SMTP id f12-v6so15972067plo.1 for ; Tue, 27 Nov 2018 09:38:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DFRqgnDvvmypi5Z3omDLBQ3tjZFin5fKesp/hF1LsfI=; b=jRV5SCV7aRv7vVlpTRCqaBNOxLYE3wb2rIqqNc3M0gBE952JrMQ7ORv9RVbclKa0YN 2Ok6kBhM/+BA2inMooy5+lw0zKmdJoXRink8rJeIv+4YAcNxCKzejgZ6VXTK6V69Fu6i tDDnJPUzKLR6iIJQ9qMSTrCYn7lym8GzENs/g= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DFRqgnDvvmypi5Z3omDLBQ3tjZFin5fKesp/hF1LsfI=; b=CwgRZ+tPZKyvf+NVu0rcPP7+xYNZliOcl1fTw7NdaF2zcu686cSrv5xc6b95nDSYi7 KSC1b8SxPVCp+e/tVJoVEgC17V8fYXSWYDcQpDc6BVfR8hc+5Kz8Cb5qWzQtM9Q0Cy+g NnWYpY+8bm+uh5ZwVB4VwjZ1UrYsRsquvxzvTHsbqCiNPuIzbbmReBNRmu+9nwOMOxxf cjKfUn8Si7+IYshbOvgQFd7RiNe4CtUkJN3RtjgFz3q1PUI++B2EB45kmUJtfVDPjkc4 eFtUIcqlchIf05+b/+Dq28qovuzQL/SMra8TwYylpX6bva+Fac108Ic6IkhnLXnoQURZ lAgQ== X-Gm-Message-State: AA+aEWbu7qv32F6JOmmuNYh5dfKi124o9AOCekxmNbqlAMw7EpNjhEhD OuQk3KDdbXfM+Fcmic79IdTRVQ== X-Google-Smtp-Source: AFSGD/V/M6f27krpRUsIjoe+dwjfk6jUeUrAK9qcNmU3DGRtJNc0y71d49spnQgpwec0sfGux75m/A== X-Received: by 2002:a17:902:d01:: with SMTP id 1mr33820364plu.127.1543340331673; Tue, 27 Nov 2018 09:38:51 -0800 (PST) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:c8e0:70d7:4be7:a36]) by smtp.gmail.com with ESMTPSA id b185sm4577547pga.85.2018.11.27.09.38.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Nov 2018 09:38:50 -0800 (PST) From: Douglas Anderson To: Jason Wessel , Daniel Thompson Cc: Will Deacon , kgdb-bugreport@lists.sourceforge.net, Peter Zijlstra , Douglas Anderson , linux-mips@linux-mips.org, linux-sh@vger.kernel.org, Borislav Petkov , linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, Catalin Marinas , James Hogan , linux-hexagon@vger.kernel.org, x86@kernel.org, Vineet Gupta , Thomas Gleixner , Michal Hocko , Ralf Baechle , linux-snps-arc@lists.infradead.org, Andrew Morton , "H. Peter Anvin" , Yoshinori Sato , Benjamin Herrenschmidt , Paul Burton , Stephen Rothwell , Ingo Molnar , Russell King , linux-arm-kernel@lists.infradead.org, Christophe Leroy , Huang Ying , "David S. Miller" , Rich Felker , Michael Ellerman , Mike Rapoport , Paul Mackerras , Richard Kuo , linuxppc-dev@lists.ozlabs.org Subject: [PATCH v6 1/4] kgdb: Remove irq flags from roundup Date: Tue, 27 Nov 2018 09:38:36 -0800 Message-Id: <20181127173839.34328-2-dianders@chromium.org> X-Mailer: git-send-email 2.20.0.rc0.387.gc7a69e6b6c-goog In-Reply-To: <20181127173839.34328-1-dianders@chromium.org> References: <20181127173839.34328-1-dianders@chromium.org> MIME-Version: 1.0 Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The function kgdb_roundup_cpus() was passed a parameter that was documented as: > the flags that will be used when restoring the interrupts. There is > local_irq_save() call before kgdb_roundup_cpus(). Nobody used those flags. Anyone who wanted to temporarily turn on interrupts just did local_irq_enable() and local_irq_disable() without looking at them. So we can definitely remove the flags. Signed-off-by: Douglas Anderson Acked-by: Will Deacon --- Changes in v6: None Changes in v5: None Changes in v4: None Changes in v3: None Changes in v2: - Removing irq flags separated from fixing lockdep splat. arch/arc/kernel/kgdb.c | 2 +- arch/arm/kernel/kgdb.c | 2 +- arch/arm64/kernel/kgdb.c | 2 +- arch/hexagon/kernel/kgdb.c | 9 ++------- arch/mips/kernel/kgdb.c | 2 +- arch/powerpc/kernel/kgdb.c | 2 +- arch/sh/kernel/kgdb.c | 2 +- arch/sparc/kernel/smp_64.c | 2 +- arch/x86/kernel/kgdb.c | 9 ++------- include/linux/kgdb.h | 9 ++------- kernel/debug/debug_core.c | 2 +- 11 files changed, 14 insertions(+), 29 deletions(-) diff --git a/arch/arc/kernel/kgdb.c b/arch/arc/kernel/kgdb.c index 9a3c34af2ae8..0932851028e0 100644 --- a/arch/arc/kernel/kgdb.c +++ b/arch/arc/kernel/kgdb.c @@ -197,7 +197,7 @@ static void kgdb_call_nmi_hook(void *ignored) kgdb_nmicallback(raw_smp_processor_id(), NULL); } -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { local_irq_enable(); smp_call_function(kgdb_call_nmi_hook, NULL, 0); diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c index caa0dbe3dc61..f21077b077be 100644 --- a/arch/arm/kernel/kgdb.c +++ b/arch/arm/kernel/kgdb.c @@ -175,7 +175,7 @@ static void kgdb_call_nmi_hook(void *ignored) kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); } -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { local_irq_enable(); smp_call_function(kgdb_call_nmi_hook, NULL, 0); diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index a20de58061a8..12c339ff6e75 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -289,7 +289,7 @@ static void kgdb_call_nmi_hook(void *ignored) kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); } -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { local_irq_enable(); smp_call_function(kgdb_call_nmi_hook, NULL, 0); diff --git a/arch/hexagon/kernel/kgdb.c b/arch/hexagon/kernel/kgdb.c index 16c24b22d0b2..012e0e230ac2 100644 --- a/arch/hexagon/kernel/kgdb.c +++ b/arch/hexagon/kernel/kgdb.c @@ -119,17 +119,12 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) /** * kgdb_roundup_cpus - Get other CPUs into a holding pattern - * @flags: Current IRQ state * * On SMP systems, we need to get the attention of the other CPUs * and get them be in a known state. This should do what is needed * to get the other CPUs to call kgdb_wait(). Note that on some arches, * the NMI approach is not used for rounding up all the CPUs. For example, - * in case of MIPS, smp_call_function() is used to roundup CPUs. In - * this case, we have to make sure that interrupts are enabled before - * calling smp_call_function(). The argument to this function is - * the flags that will be used when restoring the interrupts. There is - * local_irq_save() call before kgdb_roundup_cpus(). + * in case of MIPS, smp_call_function() is used to roundup CPUs. * * On non-SMP systems, this is not called. */ @@ -139,7 +134,7 @@ static void hexagon_kgdb_nmi_hook(void *ignored) kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); } -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { local_irq_enable(); smp_call_function(hexagon_kgdb_nmi_hook, NULL, 0); diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c index eb6c0d582626..2b05effc17b4 100644 --- a/arch/mips/kernel/kgdb.c +++ b/arch/mips/kernel/kgdb.c @@ -219,7 +219,7 @@ static void kgdb_call_nmi_hook(void *ignored) set_fs(old_fs); } -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { local_irq_enable(); smp_call_function(kgdb_call_nmi_hook, NULL, 0); diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c index 59c578f865aa..b0e804844be0 100644 --- a/arch/powerpc/kernel/kgdb.c +++ b/arch/powerpc/kernel/kgdb.c @@ -124,7 +124,7 @@ static int kgdb_call_nmi_hook(struct pt_regs *regs) } #ifdef CONFIG_SMP -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { smp_send_debugger_break(); } diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c index 4f04c6638a4d..cc57630f6bf2 100644 --- a/arch/sh/kernel/kgdb.c +++ b/arch/sh/kernel/kgdb.c @@ -319,7 +319,7 @@ static void kgdb_call_nmi_hook(void *ignored) kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); } -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { local_irq_enable(); smp_call_function(kgdb_call_nmi_hook, NULL, 0); diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c index 4792e08ad36b..f45d876983f1 100644 --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -1014,7 +1014,7 @@ void flush_dcache_page_all(struct mm_struct *mm, struct page *page) } #ifdef CONFIG_KGDB -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { smp_cross_call(&xcall_kgdb_capture, 0, 0, 0); } diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c index 8e36f249646e..ac6291a4178d 100644 --- a/arch/x86/kernel/kgdb.c +++ b/arch/x86/kernel/kgdb.c @@ -422,21 +422,16 @@ static void kgdb_disable_hw_debug(struct pt_regs *regs) #ifdef CONFIG_SMP /** * kgdb_roundup_cpus - Get other CPUs into a holding pattern - * @flags: Current IRQ state * * On SMP systems, we need to get the attention of the other CPUs * and get them be in a known state. This should do what is needed * to get the other CPUs to call kgdb_wait(). Note that on some arches, * the NMI approach is not used for rounding up all the CPUs. For example, - * in case of MIPS, smp_call_function() is used to roundup CPUs. In - * this case, we have to make sure that interrupts are enabled before - * calling smp_call_function(). The argument to this function is - * the flags that will be used when restoring the interrupts. There is - * local_irq_save() call before kgdb_roundup_cpus(). + * in case of MIPS, smp_call_function() is used to roundup CPUs. * * On non-SMP systems, this is not called. */ -void kgdb_roundup_cpus(unsigned long flags) +void kgdb_roundup_cpus(void) { apic->send_IPI_allbutself(APIC_DM_NMI); } diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index e465bb15912d..05e5b2eb0d32 100644 --- a/include/linux/kgdb.h +++ b/include/linux/kgdb.h @@ -178,21 +178,16 @@ kgdb_arch_handle_exception(int vector, int signo, int err_code, /** * kgdb_roundup_cpus - Get other CPUs into a holding pattern - * @flags: Current IRQ state * * On SMP systems, we need to get the attention of the other CPUs * and get them into a known state. This should do what is needed * to get the other CPUs to call kgdb_wait(). Note that on some arches, * the NMI approach is not used for rounding up all the CPUs. For example, - * in case of MIPS, smp_call_function() is used to roundup CPUs. In - * this case, we have to make sure that interrupts are enabled before - * calling smp_call_function(). The argument to this function is - * the flags that will be used when restoring the interrupts. There is - * local_irq_save() call before kgdb_roundup_cpus(). + * in case of MIPS, smp_call_function() is used to roundup CPUs. * * On non-SMP systems, this is not called. */ -extern void kgdb_roundup_cpus(unsigned long flags); +extern void kgdb_roundup_cpus(void); /** * kgdb_arch_set_pc - Generic call back to the program counter diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 65c0f1363788..f3cadda45f07 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -593,7 +593,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs, /* Signal the other CPUs to enter kgdb_wait() */ else if ((!kgdb_single_step) && kgdb_do_roundup) - kgdb_roundup_cpus(flags); + kgdb_roundup_cpus(); #endif /*