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b=WQUuSMw57e+e+XFpcTJLlQThnCWuUiK5Gv0nxZ2nylV5BIOdO7oV8BUmJmodij4ZPZ oMof2hrTxf5YANdWRbjrT8Bio25NvnQBzgfIf29USjq5IV3MdGEBssKbscDG7sBOEsCL irZPx63sz42Yipd0eE6fsyU367mdbDCxlLosfFyITCoAwpCVGzKMsBSF3G4IjzaZ+IFu 3MA5ErxH9oMyJs5IT4N9sh5yRhSQ6wtYNpLE0tBbZR+p+pJPeZ4t5DMCEWoP2aHmAIYi BjS4XPfXBe821pRZ6oA/F4iO2fu3i/pC436N88F9W3VN+GoEin3+clr/ozp3DKiLmIpJ MFyA== X-Gm-Message-State: AGRZ1gJCHuwiHiGPt9tgDxMe6FNubjiPWviRJ5lohjyV4YI6D0nefcma 09AL1RUgZH+rJpimNhObd/BX+Q== X-Google-Smtp-Source: AJdET5d1BEiS9eVnpREP9GcY6nBDc+TgRpo6cR3NLiALJXXRpfCKZMOIAtRRC3z9kZ0u7UVM6sOi9A== X-Received: by 2002:a62:a50d:: with SMTP id v13-v6mr16095653pfm.18.1540836517190; Mon, 29 Oct 2018 11:08:37 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:c8e0:70d7:4be7:a36]) by smtp.gmail.com with ESMTPSA id u13-v6sm20537765pgp.18.2018.10.29.11.08.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 29 Oct 2018 11:08:35 -0700 (PDT) From: Douglas Anderson To: Jason Wessel , Daniel Thompson , tglx@linutronix.de, mingo@kernel.org, gregkh@linuxfoundation.org Subject: [PATCH 7/7] kgdb: Remove irq flags and local_irq_enable/disable from roundup Date: Mon, 29 Oct 2018 11:07:07 -0700 Message-Id: <20181029180707.207546-8-dianders@chromium.org> X-Mailer: git-send-email 2.19.1.568.g152ad8e336-goog In-Reply-To: <20181029180707.207546-1-dianders@chromium.org> References: <20181029180707.207546-1-dianders@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181029_110845_029896_0F207D6A X-CRM114-Status: GOOD ( 17.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kstewart@linuxfoundation.org, linux-mips@linux-mips.org, dalias@libc.org, catalin.marinas@arm.com, linux-sh@vger.kernel.org, benh@kernel.crashing.org, will.deacon@arm.com, linux-kernel@vger.kernel.org, mhocko@suse.com, paulus@samba.org, hpa@zytor.com, sparclinux@vger.kernel.org, sfr@canb.auug.org.au, ysato@users.sourceforge.jp, mpe@ellerman.id.au, x86@kernel.org, linux@armlinux.org.uk, mingo@redhat.com, kgdb-bugreport@lists.sourceforge.net, jhogan@kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-msm@vger.kernel.org, ying.huang@intel.com, rppt@linux.vnet.ibm.com, bp@alien8.de, linux-arm-kernel@lists.infradead.org, christophe.leroy@c-s.fr, pombredanne@nexb.com, vgupta@synopsys.com, Douglas Anderson , ralf@linux-mips.org, rkuo@codeaurora.org, paul.burton@mips.com, linux-hexagon@vger.kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, davem@davemloft.net Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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. Speaking of calling local_irq_enable(), it seems like a bad idea and it caused a nice splat on my system with lockdep turned on. Specifically it hit: DEBUG_LOCKS_WARN_ON(current->hardirq_context) See the previous patch in this series ("smp: Don't yell about IRQs disabled in kgdb_roundup_cpus()") for more details, but the last few things on the stack were this on my arm64 board: lockdep_hardirqs_on+0xf0/0x160 trace_hardirqs_on+0x188/0x1ac kgdb_roundup_cpus+0x14/0x3c As agrued in the the commit text of ("smp: Don't yell about IRQs disabled in kgdb_roundup_cpus()"), it seems better to make smp_call_function() lenient about kgdb than to locally turn on IRQs here. Thus let's totally remove all the local_irq_enable() and local_irq_disable() calls from all of the kgdb_roundup_cpus() calls. Signed-off-by: Douglas Anderson --- arch/arc/kernel/kgdb.c | 4 +--- arch/arm/kernel/kgdb.c | 4 +--- arch/arm64/kernel/kgdb.c | 4 +--- arch/hexagon/kernel/kgdb.c | 11 ++--------- arch/mips/kernel/kgdb.c | 4 +--- arch/powerpc/kernel/kgdb.c | 2 +- arch/sh/kernel/kgdb.c | 4 +--- 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(+), 41 deletions(-) diff --git a/arch/arc/kernel/kgdb.c b/arch/arc/kernel/kgdb.c index 9a3c34af2ae8..d94d3cb7f9e8 100644 --- a/arch/arc/kernel/kgdb.c +++ b/arch/arc/kernel/kgdb.c @@ -197,11 +197,9 @@ 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); - local_irq_disable(); } struct kgdb_arch arch_kgdb_ops = { diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c index caa0dbe3dc61..a80e9259f7e9 100644 --- a/arch/arm/kernel/kgdb.c +++ b/arch/arm/kernel/kgdb.c @@ -175,11 +175,9 @@ 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); - local_irq_disable(); } static int __kgdb_notify(struct die_args *args, unsigned long cmd) diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index a20de58061a8..5d171c26788f 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -289,11 +289,9 @@ 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); - local_irq_disable(); } static int __kgdb_notify(struct die_args *args, unsigned long cmd) diff --git a/arch/hexagon/kernel/kgdb.c b/arch/hexagon/kernel/kgdb.c index 16c24b22d0b2..30fbc491cf45 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. */ @@ -139,11 +134,9 @@ 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); - local_irq_disable(); } #endif diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c index eb6c0d582626..6671a279966f 100644 --- a/arch/mips/kernel/kgdb.c +++ b/arch/mips/kernel/kgdb.c @@ -219,11 +219,9 @@ 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); - local_irq_disable(); } static int compute_signal(int tt) 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..86b3ea927e42 100644 --- a/arch/sh/kernel/kgdb.c +++ b/arch/sh/kernel/kgdb.c @@ -319,11 +319,9 @@ 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); - local_irq_disable(); } static int __kgdb_notify(struct die_args *args, unsigned long cmd) 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 /*