kernel.git/arch/um/Kconfig, branch linux-5.3.y

um: Support time travel mode

2019-07-02T21:27:36Z

Sometimes it can be useful to run with "time travel" inside the UML instance, for example for testing. For example, some tests for the wireless subsystem and userspace are based on hwsim, a virtual wireless adapter. Some tests can take a long time to run because they e.g. wait for 120 seconds to elapse for some regulatory checks. This obviously goes faster if it need not actually wait that long, but time inside the test environment just "bumps up" when there's nothing to do. Add CONFIG_UML_TIME_TRAVEL_SUPPORT to enable code to support such modes at runtime, selected on the command line: * just "time-travel", in which time inside the UML instance can move faster than real time, if there's nothing to do * "time-travel=inf-cpu" in which time also moves slower and any CPU processing takes no time at all, which allows to implement consistent behaviour regardless of host CPU load (or speed) or debug overhead. An additional "time-travel-start=" parameter is also supported in this case to start the wall clock at this time (in unix epoch). With this enabled, the test mentioned above goes from a runtime of about 140 seconds (with startup overhead and all) to being CPU bound and finishing in 15 seconds (on my slow laptop). Signed-off-by: Johannes Berg Signed-off-by: Richard Weinberger

arch: um: Kconfig: pedantic indention cleanups

2019-05-07T21:18:28Z

Formatting of Kconfig files doesn't look so pretty, so just take damp cloth and clean it up. Signed-off-by: Enrico Weigelt, metux IT consult Signed-off-by: Richard Weinberger

um: Revert to using stack for pt_regs in signal handling

2019-05-07T21:18:28Z

Reverts commit b6024b21fec8367ef961a771cc9dde31f1831965 and adjusts default stack sizing to cope with larger size of floating point save registers on the newer Intel CPUs. b6024b21fec8367ef961a771cc9dde31f1831965 replaced storing the register state on the stack with kmalloc-ed storage. That has a number of issues and a panic if that fails. 1. kmalloc/ATOMIC can fail. There was a latent hard crash in all interrupt and fault handling as a result. 2. kmalloc in the interrupt path introduces a considerable performance penalty for networking ~ 14% on iperf. This commit restores uml to a stable state until a better solution is found. Signed-off-by: Anton Ivanov Signed-off-by: Richard Weinberger

Merge branch 'for-linus-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

2019-01-03T02:39:22Z

Pull UML updates from Richard Weinberger: - DISCARD support for our block device driver - Many TLB flush optimizations - Various smaller fixes - And most important, Anton agreed to help me maintaining UML * 'for-linus-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Remove obsolete reenable_XX calls um: writev needs Add Anton Ivanov to UML maintainers um: remove redundant generic-y um: Optimize Flush TLB for force/fork case um: Avoid marking pages with "changed protection" um: Skip TLB flushing where not needed um: Optimize TLB operations v2 um: Remove unnecessary faulted check in uaccess.c um: Add support for DISCARD in the UBD Driver um: Remove unsafe printks from the io thread um: Clean-up command processing in UML UBD driver um: Switch to block-mq constants in the UML UBD driver um: Make GCOV depend on !KCOV um: Include sys/uio.h to have writev() um: Add HAVE_DEBUG_BUGVERBOSE um: Update maintainers file entry

um: Add HAVE_DEBUG_BUGVERBOSE

2018-12-27T21:48:11Z

This option restores the DEBUG_BUGVERBOSE functionality as it was previous to commit 9a93848fe787 ("x86/debug: Implement __WARN() using UD0"). Signed-off-by: Hernán Gonzalez Signed-off-by: Richard Weinberger

pcmcia: remove per-arch PCMCIA config entry

2018-11-29T00:39:52Z

Now that all architectures include drivers/pcmcia/Kconfig where the PCMCIA config is defined, the PCMCIA config entries in per-arch Kconfig files are redundant. Signed-off-by: Masahiro Yamada Reviewed-by: Christoph Hellwig Acked-by: Dominik Brodowski

PCI: consolidate PCI config entry in drivers/pci

2018-11-23T02:45:34Z

There is no good reason to duplicate the PCI menu in every architecture. Instead provide a selectable HAVE_PCI symbol that indicates availability of PCI support, and a FORCE_PCI symbol to for PCI on and the handle the rest in drivers/pci. Signed-off-by: Christoph Hellwig Reviewed-by: Palmer Dabbelt Acked-by: Max Filippov Acked-by: Thomas Gleixner Acked-by: Bjorn Helgaas Acked-by: Geert Uytterhoeven Acked-by: Paul Burton Signed-off-by: Masahiro Yamada

mm: remove CONFIG_HAVE_MEMBLOCK

2018-10-31T15:54:15Z

All architecures use memblock for early memory management. There is no need for the CONFIG_HAVE_MEMBLOCK configuration option. [rppt@linux.vnet.ibm.com: of/fdt: fixup #ifdefs] Link: http://lkml.kernel.org/r/20180919103457.GA20545@rapoport-lnx [rppt@linux.vnet.ibm.com: csky: fixups after bootmem removal] Link: http://lkml.kernel.org/r/20180926112744.GC4628@rapoport-lnx [rppt@linux.vnet.ibm.com: remove stale #else and the code it protects] Link: http://lkml.kernel.org/r/1538067825-24835-1-git-send-email-rppt@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1536927045-23536-4-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport Acked-by: Michal Hocko Tested-by: Jonathan Cameron Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Kroah-Hartman Cc: Guan Xuetao Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Jonas Bonn Cc: Jonathan Corbet Cc: Ley Foon Tan Cc: Mark Salter Cc: Martin Schwidefsky Cc: Matt Turner Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Paul Burton Cc: Richard Kuo Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Serge Semin Cc: Thomas Gleixner Cc: Tony Luck Cc: Vineet Gupta Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: remove CONFIG_NO_BOOTMEM

2018-10-31T15:54:14Z

All achitectures select NO_BOOTMEM which essentially becomes 'Y' for any kernel configuration and therefore it can be removed. [alexander.h.duyck@linux.intel.com: remove now defunct NO_BOOTMEM from depends list for deferred init] Link: http://lkml.kernel.org/r/20180925201814.3576.15105.stgit@localhost.localdomain Link: http://lkml.kernel.org/r/1536927045-23536-3-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport Signed-off-by: Alexander Duyck Acked-by: Michal Hocko Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Kroah-Hartman Cc: Guan Xuetao Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Jonas Bonn Cc: Jonathan Corbet Cc: Ley Foon Tan Cc: Mark Salter Cc: Martin Schwidefsky Cc: Matt Turner Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Paul Burton Cc: Richard Kuo Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Serge Semin Cc: Thomas Gleixner Cc: Tony Luck Cc: Vineet Gupta Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

um: switch to NO_BOOTMEM

2018-10-26T23:25:20Z

Replace bootmem initialization with memblock_add and memblock_reserve calls and explicit initialization of {min,max}_low_pfn. Link: http://lkml.kernel.org/r/1533326330-31677-7-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport Acked-by: Richard Weinberger Cc: Guan Xuetao Cc: Ley Foon Tan Cc: Richard Kuo Cc: Rob Herring Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds