From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1XfsBz-00053e-Ud for user-mode-linux-devel@lists.sourceforge.net; Sun, 19 Oct 2014 15:14:47 +0000 Received: from www17.your-server.de ([213.133.104.17]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1XfsBy-00041b-6t for user-mode-linux-devel@lists.sourceforge.net; Sun, 19 Oct 2014 15:14:47 +0000 Received: from [94.219.115.221] (helo=[192.168.2.108]) by www17.your-server.de with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80.1) (envelope-from ) id 1XfsBs-0005sP-0u for user-mode-linux-devel@lists.sourceforge.net; Sun, 19 Oct 2014 17:14:40 +0200 Message-ID: <1413731391.2991.20.camel@localhost.localdomain> From: Thomas Meyer Date: Sun, 19 Oct 2014 17:09:51 +0200 Mime-Version: 1.0 List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net Subject: [uml-devel] [PATCH v3 2/3] um: add a kmsg_dumper To: user-mode-linux-devel Add a kmsg_dumper, that dumps the kmsg buffer to stdout, when no console is available. This an enables the printing of early panic() calls triggered in uml_postsetup(). Signed-off-by: Thomas Meyer --- diff -r ee0ba83fd81e arch/um/kernel/Makefile --- a/arch/um/kernel/Makefile Sat Oct 11 18:55:17 2014 +0200 +++ b/arch/um/kernel/Makefile Sun Oct 12 14:42:48 2014 +0200 @@ -13,7 +13,7 @@ obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \ physmem.o process.o ptrace.o reboot.o sigio.o \ signal.o smp.o syscall.o sysrq.o time.o tlb.o trap.o \ - um_arch.o umid.o maccess.o skas/ + um_arch.o umid.o maccess.o kmsg_dump.o skas/ obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o obj-$(CONFIG_GPROF) += gprof_syms.o diff -r ee0ba83fd81e arch/um/kernel/kmsg_dump.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/arch/um/kernel/kmsg_dump.c Sun Oct 12 14:42:48 2014 +0200 @@ -0,0 +1,43 @@ +#include +#include +#include +#include +#include + +static void kmsg_dumper_stdout(struct kmsg_dumper *dumper, + enum kmsg_dump_reason reason) +{ + static char line[1024]; + + size_t len = 0; + bool con_available = false; + + /* only dump kmsg when no console is available */ + if (!console_trylock()) + return; + + if (console_drivers != NULL) + con_available = true; + + console_unlock(); + + if (con_available == true) + return; + + printf("kmsg_dump:\n"); + while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) { + line[len] = '\0'; + printf("%s", line); + } +} + +static struct kmsg_dumper kmsg_dumper = { + .dump = kmsg_dumper_stdout +}; + +int __init kmsg_dumper_stdout_init(void) +{ + return kmsg_dump_register(&kmsg_dumper); +} + +__uml_postsetup(kmsg_dumper_stdout_init); diff -r ee0ba83fd81e arch/um/kernel/um_arch.c --- a/arch/um/kernel/um_arch.c Sat Oct 11 18:55:17 2014 +0200 +++ b/arch/um/kernel/um_arch.c Sun Oct 12 14:42:48 2014 +0200 @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -234,6 +235,7 @@ static int panic_exit(struct notifier_block *self, unsigned long unused1, void *unused2) { + kmsg_dump(KMSG_DUMP_PANIC); bust_spinlocks(1); bust_spinlocks(0); uml_exitcode = 1; ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel