From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Morse Subject: [PATCH v4 03/12] ACPI / APEI: don't wait to serialise with oops messages when panic()ing Date: Wed, 16 May 2018 17:28:20 +0100 Message-ID: <20180516162829.14348-4-james.morse@arm.com> References: <20180516162829.14348-1-james.morse@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180516162829.14348-1-james.morse@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: linux-acpi@vger.kernel.org Cc: jonathan.zhang@cavium.com, Rafael Wysocki , Tony Luck , inux-mm@kvack.org, Marc Zyngier , Catalin Marinas , Tyler Baicar , Will Deacon , Dongjiu Geng , Punit Agrawal , Borislav Petkov , Naoya Horiguchi , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Len Brown List-Id: linux-acpi@vger.kernel.org oops_begin() exists to group printk() messages with the oops message printed by die(). To reach this caller we know that platform firmware took this error first, then notified the OS via NMI with a 'panic' severity. Don't wait for another CPU to release the die-lock before we can panic(), our only goal is to print this fatal error and panic(). This code is always called in_nmi(), and since 42a0bb3f7138 ("printk/nmi: generic solution for safe printk in NMI"), it has been safe to call printk() from this context. Messages are batched in a per-cpu buffer and printed via irq-work, or a call back from panic(). Link: https://patchwork.kernel.org/patch/10313555/ Acked-by: Borislav Petkov Signed-off-by: James Morse --- drivers/acpi/apei/ghes.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 5a0b8a1bddb1..9b5f9642ee32 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -33,7 +33,6 @@ #include #include #include -#include #include #include #include @@ -758,9 +757,6 @@ static int _in_nmi_notify_one(struct ghes *ghes) sev = ghes_severity(ghes->estatus->error_severity); if (sev >= GHES_SEV_PANIC) { -#ifdef CONFIG_X86 - oops_begin(); -#endif ghes_print_queued_estatus(); __ghes_panic(ghes); } -- 2.16.2