Changes in sysrq.c

0f659ff3 - um: Always dump trace for specified task in show_stack

Wed, 06 Nov 2024 10:39:33 +0000

um: Always dump trace for specified task in show_stackCurrently, show_stack() always dumps the trace of the current task.However, it should dump the trace of the specified task if one isprovided. Otherwise, things like running "echo t > sysrq-trigger"won't work as expected.Fixes: 970e51feaddb ("um: Add support for CONFIG_STACKTRACE")Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241106103933.1132365-1-tiwei.btw@antgroup.comSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/kernel/sysrq.c

ce6e85a1 - um: remove broken double fault detection

Sun, 03 Nov 2024 15:05:06 +0000

um: remove broken double fault detectionThe show_stack function had some code to detect double faults. However,the logic is wrong and it would e.g. trigger if a WARNING happenedinside an IRQ.Remove it without trying to add a new logic. The current behaviour,which will just fault repeatedly until the IRQ stack is used up and thehost kills UML, seems to be good enough.Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20241103150506.1367695-5-benjamin@sipsolutions.netSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/kernel/sysrq.c

ae0dc67c - um: Remove outdated asm/sysrq.h header

Mon, 26 Aug 2024 10:08:15 +0000

um: Remove outdated asm/sysrq.h headerThis header no longer serves a purpose after show_trace was removedby commit 9d1ee8ce92e1 ("um: Rewrite show_stack()").Signed-off-by: Tiwei Bie Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

2975e4a2 - um: Prevent KASAN splats in dump_stack()

Wed, 07 Sep 2022 10:05:33 +0000

um: Prevent KASAN splats in dump_stack()Use READ_ONCE_NOCHECK() when reading the stack to prevent KASAN splatswhen dump_stack() is used.Fixes: 5b301409e8bc5d7fad ("UML: add support for KASAN under x86_64")Signed-off-by: Vincent Whitchurch Reviewed-by: Dmitry Vyukov Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

273fe1b6 - um: Clean up stacktrace dump

Mon, 21 Sep 2020 11:43:25 +0000

um: Clean up stacktrace dumpWe currently get a few stray newlines, due to the interactionbetween printk() and the code here. Remove a few explicitnewline prints to neaten the output.Signed-off-by: Johannes Berg Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

9cb8f069 - kernel: rename show_stack_loglvl() => show_stack()

Tue, 09 Jun 2020 04:32:29 +0000

kernel: rename show_stack_loglvl() => show_stack()Now the last users of show_stack() got converted to use an explicit loglevel, show_stack_loglvl() can drop it's redundant suffix and become onceagain well known show_stack().Signed-off-by: Dmitry Safonov Signed-off-by: Andrew Morton Link: http://lkml.kernel.org/r/20200418201944.482088-51-dima@arista.comSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/um/kernel/sysrq.c

1ad87824 - um: add show_stack_loglvl()

Tue, 09 Jun 2020 04:31:45 +0000

um: add show_stack_loglvl()Currently, the log-level of show_stack() depends on a platformrealization. It creates situations where the headers are printed withlower log level or higher than the stacktrace (depending on a platform oruser).Furthermore, it forces the logic decision from user to an architectureside. In result, some users as sysrq/kdb/etc are doing tricks withtemporary rising console_loglevel while printing their messages. And inresult it not only may print unwanted messages from other CPUs, but alsoomit printing at all in the unlucky case where the printk() was deferred.Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easierapproach than introducing more printk buffers. Also, it will consolidateprintings with headers.Introduce show_stack_loglvl(), that eventually will substituteshow_stack().[1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#uSigned-off-by: Dmitry Safonov Signed-off-by: Andrew Morton Cc: Anton Ivanov Cc: Jeff Dike Cc: Richard Weinberger Link: http://lkml.kernel.org/r/20200418201944.482088-37-dima@arista.comSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/um/kernel/sysrq.c

3dd923f3 - um/sysrq: remove needless variable sp

Tue, 09 Jun 2020 04:31:42 +0000

um/sysrq: remove needless variable sp`sp' is a needless excercise here.Signed-off-by: Dmitry Safonov Signed-off-by: Andrew Morton Cc: Anton Ivanov Cc: Jeff Dike Cc: Richard Weinberger Link: http://lkml.kernel.org/r/20200418201944.482088-36-dima@arista.comSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/um/kernel/sysrq.c

d2912cb1 - treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Tue, 04 Jun 2019 08:11:33 +0000

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation #extracted by the scancode license scanner the SPDX license identifier GPL-2.0-onlyhas been chosen to replace the boilerplate/reference in 4122 file(s).Signed-off-by: Thomas Gleixner Reviewed-by: Enrico Weigelt Reviewed-by: Kate Stewart Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.orgLink: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.deSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/arch/um/kernel/sysrq.c

d75f773c - treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively

Mon, 25 Mar 2019 19:32:28 +0000

treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively%pF and %pf are functionally equivalent to %pS and %ps conversionspecifiers. The former are deprecated, therefore switch the current usersto use the preferred variant.The changes have been produced by the following command: git grep -l '%p[fF]' | grep -v '^$tools\|Documentation$/' | \ while read i; do perl -i -pe 's/%pf/%ps/g; s/%pF/%pS/g;' $i; doneAnd verifying the result.Link: http://lkml.kernel.org/r/20190325193229.23390-1-sakari.ailus@linux.intel.comCc: Andy Shevchenko Cc: linux-arm-kernel@lists.infradead.orgCc: sparclinux@vger.kernel.orgCc: linux-um@lists.infradead.orgCc: xen-devel@lists.xenproject.orgCc: linux-acpi@vger.kernel.orgCc: linux-pm@vger.kernel.orgCc: drbd-dev@lists.linbit.comCc: linux-block@vger.kernel.orgCc: linux-mmc@vger.kernel.orgCc: linux-nvdimm@lists.01.orgCc: linux-pci@vger.kernel.orgCc: linux-scsi@vger.kernel.orgCc: linux-btrfs@vger.kernel.orgCc: linux-f2fs-devel@lists.sourceforge.netCc: linux-mm@kvack.orgCc: ceph-devel@vger.kernel.orgCc: netdev@vger.kernel.orgSigned-off-by: Sakari Ailus Acked-by: David Sterba (for btrfs)Acked-by: Mike Rapoport (for mm/memblock.c)Acked-by: Bjorn Helgaas (for drivers/pci)Acked-by: Rafael J. Wysocki Signed-off-by: Petr Mladek List of files: /linux-6.15/arch/um/kernel/sysrq.c

ecb6c743 - um: Fix _print_addr()

Sun, 25 Dec 2016 22:11:05 +0000

um: Fix _print_addr()Recent changes to printk() broke UML's stack traceoutput. Kill the root of the problem by using a singleprintk() statement.Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

3f8c2452 - sched/headers: Prepare to move kstack_end() from to

Sun, 05 Feb 2017 13:31:22 +0000

sched/headers: Prepare to move kstack_end() from to But first update the usage sites with the new header dependency.Acked-by: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.orgSigned-off-by: Ingo Molnar List of files: /linux-6.15/arch/um/kernel/sysrq.c

b17b0153 - sched/headers: Prepare for new header dependencies before moving code to

Wed, 08 Feb 2017 17:51:35 +0000

sched/headers: Prepare for new header dependencies before moving code to We are going to split out of , whichwill have to be picked up from other headers and a couple of .c files.Create a trivial placeholder file that justmaps to to make this patch obviously correct andbisectable.Include the new header in the files that are going to need it.Acked-by: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.orgSigned-off-by: Ingo Molnar List of files: /linux-6.15/arch/um/kernel/sysrq.c

fcf81931 - um: Remove dead code from stacktrace

Wed, 18 Mar 2015 13:11:04 +0000

um: Remove dead code from stacktraceRemove left over code from commit 970e51feaddb(um: Add support for CONFIG_STACKTRACE)Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

970e51fe - um: Add support for CONFIG_STACKTRACE

Wed, 20 Aug 2014 09:56:00 +0000

um: Add support for CONFIG_STACKTRACEAdd stacktrace support for User Mode LinuxSigned-off-by: Daniel Walter Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

8ed12fcc - um: Rename print_stack_trace to do_stack_trace

Thu, 21 Nov 2013 08:27:37 +0000

um: Rename print_stack_trace to do_stack_traceWe cannot use print_stack_trace because the name conflictswith linux/stacktrace.h.Reported-by: Randy Dunlap Acked-by: Randy Dunlap Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

e96d1c36 - um: Make kstack_depth_to_print conform to arch/x86

Mon, 23 Sep 2013 15:38:04 +0000

um: Make kstack_depth_to_print conform to arch/x86Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

f72c22e4 - um: Make stack trace reliable against kernel mode faults

Mon, 23 Sep 2013 15:38:02 +0000

um: Make stack trace reliable against kernel mode faultsAs UML uses an alternative signal stack we cannot usethe current stack pointer for stack dumping if UML itselfdies by SIGSEGV. To bypass this issue we save regs takenfrom mcontext in our segv handler into thread_struct anduse these regs to obtain the stack pointer in show_stack().Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

9d1ee8ce - um: Rewrite show_stack()

Mon, 23 Sep 2013 15:38:01 +0000

um: Rewrite show_stack()Currently on UML stack traces are not very reliable and bothx86 and x86_64 have their on implementations.This patch unifies both and adds support to outline unreliablefunctions calls.Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/kernel/sysrq.c

0a0fca9d - sched: Rename sched.c as sched/core.c in comments and Documentation

Tue, 04 Jun 2013 07:40:24 +0000

sched: Rename sched.c as sched/core.c in comments and DocumentationMost of the stuff from kernel/sched.c was moved to kernel/sched/core.c long timeback and the comments/Documentation never got updated.I figured it out when I was going through sched-domains.txt and so thought offixing it globally.I haven't crossed check if the stuff that is referenced in sched/core.c by allthese files is still present and hasn't changed as that wasn't the motive behindthis patch.Signed-off-by: Viresh Kumar Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/cdff76a265326ab8d71922a1db5be599f20aad45.1370329560.git.viresh.kumar@linaro.orgSigned-off-by: Ingo Molnar List of files: /linux-6.15/arch/um/kernel/sysrq.c