Mike Travis d0a9964e98 x86/platform/uv: Implement simple dump failover if kdump fails ... The ability to trigger a kdump using the system NMI command was added by commit 12ba6c990f ("x86/UV: Add kdump to UV NMI handler") Author: Mike Travis <travis@sgi.com> Date: Mon Sep 23 16:25:03 2013 -0500 This is useful because when kdump is working the information gathered is more informative than the original per CPU stack traces or "dump" option. However a number of things can go wrong with kdump and then the stack traces are more useful than nothing. The two most common reasons for kdump to not be available are: 1) if a problem occurs during boot before the kdump service is started, or 2) the kdump daemon failed to start. In either case the call to crash_kexec() returns unexpectedly. When this happens uv_nmi_kdump() also sets the uv_nmi_kexec_failed flag which causes the slave CPU's to also return to the NMI handler. Upon this unexpected return to the NMI handler, the NMI handler will revert to the "dump" action which uses show_regs() to obtain a process trace dump for all the CPU's. Other minor changes: The "dump" action now generates both the show_regs() stack trace and show instruction pointer information. Whereas the "ips" action only shows instruction pointers for non-idle CPU's. This is more like an abbreviated "ps" display. Change printk(KERN_DEFAULT...) --> pr_info() Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: George Beshers <gbeshers@sgi.com> Cc: Alex Thorlton <athorlton@sgi.com> Cc: Dimitri Sivanich <sivanich@sgi.com> Cc: Hedi Berriche <hedi@sgi.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russ Anderson <rja@sgi.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-09-14 15:31:30 +02:00
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atom	x86/platform: Make atom/pmc_atom.c explicitly non-modular	2015-08-25 09:47:50 +02:00
ce4100	x86: ce4100, irq: Do not set legacy_pic to null_legacy_pic	2014-06-21 23:05:42 +02:00
efi	kexec: split kexec_load syscall from kexec core code	2015-09-10 13:29:01 -07:00
geode	x86/geode: Fix incorrect placement of __initdata tag	2013-10-01 13:21:27 +02:00
goldfish	goldfish: platform device for x86	2013-01-21 12:09:19 -08:00
intel	x86/platform/iosf_mbi: Add Intel Tangier PCI id	2015-07-16 17:48:48 +02:00
intel-mid	Replace module_init with equivalent device_initcall in non modules.	2015-07-02 10:30:48 -07:00
intel-quark	x86/intel/quark: Run IMR self-test on IMR capble hw only	2015-04-02 12:47:50 +02:00
iris	x86: platform: iris: drop owner assignment from platform_drivers	2014-10-20 16:20:15 +02:00
olpc	x86/olpc/xo15/sci: Use newly added power_supply_put API	2015-03-13 23:15:53 +01:00
scx200	X86: drivers: remove __dev* attributes.	2013-01-03 15:57:04 -08:00
sfi	x86: Cleanup irq_domain ops	2015-04-24 15:36:55 +02:00
ts5500	x86/platform/ts5500: Add support for TS-5400 boards	2014-07-16 21:17:42 +02:00
uv	x86/platform/uv: Implement simple dump failover if kdump fails	2015-09-14 15:31:30 +02:00
Makefile	x86/platform/iosf_mbi: Move to dedicated folder	2015-07-16 17:48:47 +02:00