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2024-04-15openrisc: Move FPU state out of pt_regsStafford Horne1-0/+5
My original, naive, FPU support patch had the FPCSR register stored during both the *mode switch* and *context switch*. This is wasteful. Also, the original patches did not save the FPU state when handling signals during the system call fast path. We fix this by moving the FPCSR state to thread_struct in task_struct. We also introduce new helper functions save_fpu and restore_fpu which can be used to sync the FPU with thread_struct. These functions are now called when needed: - Setting up and restoring sigcontext when handling signals - Before and after __switch_to during context switches - When handling FPU exceptions - When reading and writing FPU register sets In the future we can further optimize this by doing lazy FPU save and restore. For example, FPU sync is not needed when switching to and from kernel threads (x86 does this). FPU save and restore does not need to be done two times if we have both rescheduling and signal work to do. However, since OpenRISC FPU state is a single register, I leave these optimizations for future consideration. Signed-off-by: Stafford Horne <[email protected]>
2024-04-15openrisc: Use do_kernel_power_off()Stafford Horne1-5/+3
After commit 14c5678720bd ("power: reset: syscon-poweroff: Use devm_register_sys_off_handler(POWER_OFF)") setting up of pm_power_off was removed from the driver, this causes OpenRISC platforms using syscon-poweroff to no longer shutdown. The kernel now supports chained power-off handlers. Use do_kernel_power_off() that invokes chained power-off handlers. All architectures have moved away from using pm_power_off except OpenRISC. This patch migrates openrisc to use do_kernel_power_off() instead of the legacy pm_power_off(). Fixes: 14c5678720bd ("power: reset: syscon-poweroff: Use devm_register_sys_off_handler(POWER_OFF)") Signed-off-by: Stafford Horne <[email protected]> Reviewed-by: Sebastian Reichel <[email protected]>
2023-08-21openrisc: Include cpu.h and switch_to.h for prototypesStafford Horne1-0/+2
When compiling with W=1 enabling -Wmissing-prototypes the compiler warns: arch/openrisc/kernel/process.c:100:6: error: no previous prototype for 'arch_cpu_idle' [-Werror=missing-prototypes] arch/openrisc/kernel/process.c:240:21: error: no previous prototype for '__switch_to' [-Werror=missing-prototypes] Fix these by adding the approrpiate header files to process.c which brings in the prototype definitions. Reported-by: Arnd Bergmann <[email protected]> Closes: https://lore.kernel.org/linux-kernel/[email protected]/ Signed-off-by: Stafford Horne <[email protected]>
2023-08-21openrisc: Add prototype for show_registers to processor.hStafford Horne1-2/+0
When compiling with W=1 enabling -Wmissing-prototypes the compiler warns: arch/openrisc/kernel/traps.c:67:6: error: no previous prototype for 'show_registers' [-Werror=missing-prototypes] Fix by adding the prototype to the appropriate header file and including the header file in the appropriate C files. Reported-by: Arnd Bergmann <[email protected]> Closes: https://lore.kernel.org/linux-kernel/[email protected]/ Signed-off-by: Stafford Horne <[email protected]>
2023-01-13arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabledPeter Zijlstra1-0/+1
Current arch_cpu_idle() is called with IRQs disabled, but will return with IRQs enabled. However, the very first thing the generic code does after calling arch_cpu_idle() is raw_local_irq_disable(). This means that architectures that can idle with IRQs disabled end up doing a pointless 'enable-disable' dance. Therefore, push this IRQ disabling into the idle function, meaning that those architectures can avoid the pointless IRQ state flipping. Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Tested-by: Tony Lindgren <[email protected]> Tested-by: Ulf Hansson <[email protected]> Reviewed-by: Gautham R. Shenoy <[email protected]> Acked-by: Mark Rutland <[email protected]> [arm64] Acked-by: Rafael J. Wysocki <[email protected]> Acked-by: Guo Ren <[email protected]> Acked-by: Frederic Weisbecker <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2022-09-11kernel: exit: cleanup release_thread()Kefeng Wang1-4/+0
Only x86 has own release_thread(), introduce a new weak release_thread() function to clean empty definitions in other ARCHs. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Kefeng Wang <[email protected]> Acked-by: Guo Ren <[email protected]> [csky] Acked-by: Russell King (Oracle) <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Acked-by: Brian Cain <[email protected]> Acked-by: Michael Ellerman <[email protected]> [powerpc] Acked-by: Stafford Horne <[email protected]> [openrisc] Acked-by: Catalin Marinas <[email protected]> [arm64] Acked-by: Huacai Chen <[email protected]> [LoongArch] Cc: Alexander Gordeev <[email protected]> Cc: Anton Ivanov <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Christophe Leroy <[email protected]> Cc: Chris Zankel <[email protected]> Cc: Dave Hansen <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Dinh Nguyen <[email protected]> Cc: Guo Ren <[email protected]> [csky] Cc: Heiko Carstens <[email protected]> Cc: Helge Deller <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ivan Kokshaysky <[email protected]> Cc: James Bottomley <[email protected]> Cc: Johannes Berg <[email protected]> Cc: Jonas Bonn <[email protected]> Cc: Matt Turner <[email protected]> Cc: Max Filippov <[email protected]> Cc: Michal Simek <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Richard Henderson <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Rich Felker <[email protected]> Cc: Stefan Kristiansson <[email protected]> Cc: Sven Schnelle <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Will Deacon <[email protected]> Cc: Xuerui Wang <[email protected]> Cc: Yoshinori Sato <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
2022-06-03Merge tag 'kthread-cleanups-for-v5.19' of ↵Linus Torvalds1-5/+7
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull kthread updates from Eric Biederman: "This updates init and user mode helper tasks to be ordinary user mode tasks. Commit 40966e316f86 ("kthread: Ensure struct kthread is present for all kthreads") caused init and the user mode helper threads that call kernel_execve to have struct kthread allocated for them. This struct kthread going away during execve in turned made a use after free of struct kthread possible. Here, commit 343f4c49f243 ("kthread: Don't allocate kthread_struct for init and umh") is enough to fix the use after free and is simple enough to be backportable. The rest of the changes pass struct kernel_clone_args to clean things up and cause the code to make sense. In making init and the user mode helpers tasks purely user mode tasks I ran into two complications. The function task_tick_numa was detecting tasks without an mm by testing for the presence of PF_KTHREAD. The initramfs code in populate_initrd_image was using flush_delayed_fput to ensuere the closing of all it's file descriptors was complete, and flush_delayed_fput does not work in a userspace thread. I have looked and looked and more complications and in my code review I have not found any, and neither has anyone else with the code sitting in linux-next" * tag 'kthread-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: sched: Update task_tick_numa to ignore tasks without an mm fork: Stop allowing kthreads to call execve fork: Explicitly set PF_KTHREAD init: Deal with the init process being a user mode process fork: Generalize PF_IO_WORKER handling fork: Explicity test for idle tasks in copy_thread fork: Pass struct kernel_clone_args into copy_thread kthread: Don't allocate kthread_struct for init and umh
2022-05-23openrisc: Allow power off handler overridingStafford Horne1-2/+15
The OpenRISC platform always defines a default pm_power_off hanlder which is only useful for simulators. Having this set also means power management drivers like syscon-power are not able to wire in their own pm_power_off handlers. Fix this by not setting the pm_power_off handler by default and fallback to the simulator power off handler if no handler is set. This has been tested with a new OpenRISC virt platform I am working on for QEMU. https://github.com/stffrdhrn/qemu/commits/or1k-virt Cc: Jason A. Donenfeld <[email protected]> Signed-off-by: Stafford Horne <[email protected]>
2022-05-23openrisc: define nop command for simulator rebootJason A. Donenfeld1-0/+2
The simulator defines `l.nop 1` for shutdown, but doesn't have anything for reboot. Use 13 for this, which is currently unused, dubbed `NOP_REBOOT`. Cc: Stafford Horne <[email protected]> Cc: Peter Maydell <[email protected]> Link: https://lore.kernel.org/all/[email protected]/ Signed-off-by: Jason A. Donenfeld <[email protected]> Signed-off-by: Stafford Horne <[email protected]>
2022-05-07fork: Generalize PF_IO_WORKER handlingEric W. Biederman1-4/+3
Add fn and fn_arg members into struct kernel_clone_args and test for them in copy_thread (instead of testing for PF_KTHREAD | PF_IO_WORKER). This allows any task that wants to be a user space task that only runs in kernel mode to use this functionality. The code on x86 is an exception and still retains a PF_KTHREAD test because x86 unlikely everything else handles kthreads slightly differently than user space tasks that start with a function. The functions that created tasks that start with a function have been updated to set ".fn" and ".fn_arg" instead of ".stack" and ".stack_size". These functions are fork_idle(), create_io_thread(), kernel_thread(), and user_mode_thread(). Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: "Eric W. Biederman" <[email protected]>
2022-05-07fork: Pass struct kernel_clone_args into copy_threadEric W. Biederman1-2/+5
With io_uring we have started supporting tasks that are for most purposes user space tasks that exclusively run code in kernel mode. The kernel task that exec's init and tasks that exec user mode helpers are also user mode tasks that just run kernel code until they call kernel execve. Pass kernel_clone_args into copy_thread so these oddball tasks can be supported more cleanly and easily. v2: Fix spelling of kenrel_clone_args on h8300 Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: "Eric W. Biederman" <[email protected]>
2021-10-15sched: Add wrapper for get_wchan() to keep task blockedKees Cook1-1/+1
Having a stable wchan means the process must be blocked and for it to stay that way while performing stack unwinding. Suggested-by: Peter Zijlstra <[email protected]> Signed-off-by: Kees Cook <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Acked-by: Russell King (Oracle) <[email protected]> [arm] Tested-by: Mark Rutland <[email protected]> [arm64] Link: https://lkml.kernel.org/r/[email protected]
2021-08-19isystem: trim/fixup stdarg.h and other headersAlexey Dobriyan1-2/+0
Delete/fixup few includes in anticipation of global -isystem compile option removal. Note: crypto/aegis128-neon-inner.c keeps <stddef.h> due to redefinition of uintptr_t error (one definition comes from <stddef.h>, another from <linux/types.h>). Signed-off-by: Alexey Dobriyan <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
2021-02-27Merge tag 'io_uring-worker.v3-2021-02-25' of git://git.kernel.dk/linux-blockLinus Torvalds1-1/+1
Pull io_uring thread rewrite from Jens Axboe: "This converts the io-wq workers to be forked off the tasks in question instead of being kernel threads that assume various bits of the original task identity. This kills > 400 lines of code from io_uring/io-wq, and it's the worst part of the code. We've had several bugs in this area, and the worry is always that we could be missing some pieces for file types doing unusual things (recent /dev/tty example comes to mind, userfaultfd reads installing file descriptors is another fun one... - both of which need special handling, and I bet it's not the last weird oddity we'll find). With these identical workers, we can have full confidence that we're never missing anything. That, in itself, is a huge win. Outside of that, it's also more efficient since we're not wasting space and code on tracking state, or switching between different states. I'm sure we're going to find little things to patch up after this series, but testing has been pretty thorough, from the usual regression suite to production. Any issue that may crop up should be manageable. There's also a nice series of further reductions we can do on top of this, but I wanted to get the meat of it out sooner rather than later. The general worry here isn't that it's fundamentally broken. Most of the little issues we've found over the last week have been related to just changes in how thread startup/exit is done, since that's the main difference between using kthreads and these kinds of threads. In fact, if all goes according to plan, I want to get this into the 5.10 and 5.11 stable branches as well. That said, the changes outside of io_uring/io-wq are: - arch setup, simple one-liner to each arch copy_thread() implementation. - Removal of net and proc restrictions for io_uring, they are no longer needed or useful" * tag 'io_uring-worker.v3-2021-02-25' of git://git.kernel.dk/linux-block: (30 commits) io-wq: remove now unused IO_WQ_BIT_ERROR io_uring: fix SQPOLL thread handling over exec io-wq: improve manager/worker handling over exec io_uring: ensure SQPOLL startup is triggered before error shutdown io-wq: make buffered file write hashed work map per-ctx io-wq: fix race around io_worker grabbing io-wq: fix races around manager/worker creation and task exit io_uring: ensure io-wq context is always destroyed for tasks arch: ensure parisc/powerpc handle PF_IO_WORKER in copy_thread() io_uring: cleanup ->user usage io-wq: remove nr_process accounting io_uring: flag new native workers with IORING_FEAT_NATIVE_WORKERS net: remove cmsg restriction from io_uring based send/recvmsg calls Revert "proc: don't allow async path resolution of /proc/self components" Revert "proc: don't allow async path resolution of /proc/thread-self components" io_uring: move SQPOLL thread io-wq forked worker io-wq: make io_wq_fork_thread() available to other users io-wq: only remove worker from free_list, if it was there io_uring: remove io_identity io_uring: remove any grabbing of context ...
2021-02-21arch: setup PF_IO_WORKER threads like PF_KTHREADJens Axboe1-1/+1
PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the sense that we don't assign ->set_child_tid with our own structure. Just ensure that every arch sets up the PF_IO_WORKER threads like kthreads in the arch implementation of copy_thread(). Signed-off-by: Jens Axboe <[email protected]>
2021-01-01openrisc: restart: Call common handlers before hangingJoel Stanley1-3/+10
Currently openrisc will print a message and then hang in an infinite loop when rebooting. This patch adopts some code from ARM, which calls the common restart infrastructure and hangs after a small delay if the restart infra doesn't do anything. Signed-off-by: Joel Stanley <[email protected]> Signed-off-by: Stafford Horne <[email protected]>
2020-11-24sched/idle: Fix arch_cpu_idle() vs tracingPeter Zijlstra1-1/+1
We call arch_cpu_idle() with RCU disabled, but then use local_irq_{en,dis}able(), which invokes tracing, which relies on RCU. Switch all arch_cpu_idle() implementations to use raw_local_irq_{en,dis}able() and carefully manage the lockdep,rcu,tracing state like we do in entry. (XXX: we really should change arch_cpu_idle() to not return with interrupts enabled) Reported-by: Sven Schnelle <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Reviewed-by: Mark Rutland <[email protected]> Tested-by: Mark Rutland <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
2020-08-09Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds1-7/+0
Pull regset conversion fix from Al Viro: "Fix a regression from an unnoticed bisect hazard in the regset series. A bunch of old (aout, originally) primitives used by coredumps became dead code after fdpic conversion to regsets. Removal of that dead code had been the first commit in the followups to regset series; unfortunately, it happened to hide the bisect hazard on sh (extern for fpregs_get() had not been updated in the main series when it should have been; followup simply made fpregs_get() static). And without that followup commit this bisect hazard became breakage in the mainline" Tested-by: John Paul Adrian Glaubitz <[email protected]> * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: kill unused dump_fpu() instances
2020-07-27kill unused dump_fpu() instancesAl Viro1-7/+0
dump_fpu() is used only on the architectures that support elf and have neither CORE_DUMP_USE_REGSET nor ELF_CORE_COPY_FPREGS defined. Currently that's csky, m68k, microblaze, nds32 and unicore32. The rest of the instances are dead code. NB: THIS MUST GO AFTER ELF_FDPIC CONVERSION Signed-off-by: Al Viro <[email protected]>
2020-07-04arch: rename copy_thread_tls() back to copy_thread()Christian Brauner1-3/+3
Now that HAVE_COPY_THREAD_TLS has been removed, rename copy_thread_tls() back simply copy_thread(). It's a simpler name, and doesn't imply that only tls is copied here. This finishes an outstanding chunk of internal process creation work since we've added clone3(). Cc: [email protected] Acked-by: Thomas Bogendoerfer <[email protected]>A Acked-by: Stafford Horne <[email protected]> Acked-by: Greentime Hu <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]>A Reviewed-by: Kees Cook <[email protected]> Signed-off-by: Christian Brauner <[email protected]>
2020-06-09mm: don't include asm/pgtable.h if linux/mm.h is already includedMike Rapoport1-1/+0
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done Signed-off-by: Mike Rapoport <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Cain <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Chris Zankel <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Greentime Hu <[email protected]> Cc: Greg Ungerer <[email protected]> Cc: Guan Xuetao <[email protected]> Cc: Guo Ren <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Helge Deller <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ley Foon Tan <[email protected]> Cc: Mark Salter <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Matt Turner <[email protected]> Cc: Max Filippov <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Michal Simek <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Nick Hu <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Rich Felker <[email protected]> Cc: Russell King <[email protected]> Cc: Stafford Horne <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tony Luck <[email protected]> Cc: Vincent Chen <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Will Deacon <[email protected]> Cc: Yoshinori Sato <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>
2020-03-02openrisc: Cleanup copy_thread_tls docs and commentsStafford Horne1-1/+0
Previously copy_thread_tls was copy_thread and before that something else. Remove the documentation about the regs parameter that didn't exist in either version. Next, fix comment wrapping and details about how TLS pointer gets to the copy_thread_tls function. Signed-off-by: Stafford Horne <[email protected]> Acked-by: Christian Brauner <[email protected]>
2020-03-02openrisc: Convert copy_thread to copy_thread_tlsStafford Horne1-11/+6
This is required for clone3 which passes the TLS value through a struct rather than a register. Signed-off-by: Stafford Horne <[email protected]> Acked-by: Christian Brauner <[email protected]>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner1-5/+1
Based on 1 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 as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Allison Randal <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
2017-07-07Merge tag 'openrisc-for-linus' of git://github.com/openrisc/linuxLinus Torvalds1-1/+1
Pull OpenRISC updates from Stafford Horne: "Openrisc fixes for this 4.13 merge window, there is not really much here: - include cleanups, one with should reduce build time slightly - switch to new toolchain to new (>2 year old) toolchain prefix" * tag 'openrisc-for-linus' of git://github.com/openrisc/linux: openrisc: defconfig: Cleanup from old Kconfig options openrisc: explicitly include linux/bug.h in asm/fixmap.h openrisc: Switch to use export.h instead of module.h openrisc: Change toolchain from or32- to or1k-
2017-06-28arch: remove unused macro/function thread_saved_pc()Tobias Klauser1-5/+0
The only user of thread_saved_pc() in non-arch-specific code was removed in commit 8243d5597793 ("sched/core: Remove pointless printout in sched_show_task()"). Remove the implementations as well. Some architectures use thread_saved_pc() in their arch-specific code. Leave their thread_saved_pc() intact. Signed-off-by: Tobias Klauser <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Cc: Ingo Molnar <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2017-05-29kthread: fix boot hang (regression) on MIPS/OpenRISCVegard Nossum1-2/+0
This fixes a regression in commit 4d6501dce079 where I didn't notice that MIPS and OpenRISC were reinitialising p->{set,clear}_child_tid to NULL after our initialisation in copy_process(). We can simply get rid of the arch-specific initialisation here since it is now always done in copy_process() before hitting copy_thread{,_tls}(). Review notes: - As far as I can tell, copy_process() is the only user of copy_thread_tls(), which is the only caller of copy_thread() for architectures that don't implement copy_thread_tls(). - After this patch, there is no arch-specific code touching p->set_child_tid or p->clear_child_tid whatsoever. - It may look like MIPS/OpenRISC wanted to always have these fields be NULL, but that's not true, as copy_process() would unconditionally set them again _after_ calling copy_thread_tls() before commit 4d6501dce079. Fixes: 4d6501dce079c1eb6bf0b1d8f528a5e81770109e ("kthread: Fix use-after-free if kthread fork fails") Reported-by: Guenter Roeck <[email protected]> Tested-by: Guenter Roeck <[email protected]> # MIPS only Acked-by: Stafford Horne <[email protected]> Acked-by: Oleg Nesterov <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: [email protected] Cc: Jonas Bonn <[email protected]> Cc: Stefan Kristiansson <[email protected]> Cc: [email protected] Cc: Jamie Iles <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Vegard Nossum <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2017-05-15openrisc: Switch to use export.h instead of module.hStafford Horne1-1/+1
Reduce dependencies on module.h since all we need here is export.h for EXPORT_SYMBOL. Fixes: f50169324df4 ("module.h: split out the EXPORT_SYMBOL into export.h") Signed-off-by: Stafford Horne <[email protected]>
2017-03-16openrisc: Export symbols needed by modulesStafford Horne1-0/+1
This was detected by allmodconfig, errors reported: ERROR: "empty_zero_page" [net/ceph/libceph.ko] undefined! ERROR: "__ucmpdi2" [lib/842/842_decompress.ko] undefined! ERROR: "empty_zero_page" [fs/nfs/objlayout/objlayoutdriver.ko] undefined! ERROR: "empty_zero_page" [fs/exofs/exofs.ko] undefined! ERROR: "empty_zero_page" [fs/crypto/fscrypto.ko] undefined! ERROR: "__ucmpdi2" [fs/btrfs/btrfs.ko] undefined! ERROR: "pm_power_off" [drivers/regulator/act8865-regulator.ko] undefined! ERROR: "__ucmpdi2" [drivers/media/i2c/adv7842.ko] undefined! ERROR: "__clear_user" [drivers/md/dm-mod.ko] undefined! ERROR: "__clear_user" [net/netfilter/x_tables.ko] undefined! Signed-off-by: Stafford Horne <[email protected]>
2017-03-02sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar1-0/+1
<linux/sched/task_stack.h> We are going to split <linux/sched/task_stack.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task_stack.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Signed-off-by: Ingo Molnar <[email protected]>
2017-03-02sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar1-0/+1
<linux/sched/task.h> We are going to split <linux/sched/task.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Signed-off-by: Ingo Molnar <[email protected]>
2017-03-02sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar1-0/+1
<linux/sched/debug.h> We are going to split <linux/sched/debug.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/debug.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Signed-off-by: Ingo Molnar <[email protected]>
2017-02-25openrisc: Initial support for the idle stateSebastian Macke1-0/+11
This patch adds basic support for the idle state of the cpu. The patch overrides the regular idle function, enables the interupts, checks for the power management unit and enables the cpu doze mode if available. Signed-off-by: Sebastian Macke <[email protected]> [[email protected]: Fixed checkpatch, blankline after declarations] Signed-off-by: Stafford Horne <[email protected]>
2017-02-06openrisc: add l.lwa/l.swa emulationStefan Kristiansson1-0/+3
This adds an emulation layer for implementations that lack the l.lwa and l.swa instructions. It handles these instructions both in kernel space and user space. Signed-off-by: Stefan Kristiansson <[email protected]> [[email protected]: Added delay slot pc adjust logic] Signed-off-by: Stafford Horne <[email protected]>
2016-12-24Replace <asm/uaccess.h> with <linux/uaccess.h> globallyLinus Torvalds1-1/+1
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2016-12-12openrisc: Add thread-local storage (TLS) supportChristian Svensson1-0/+13
Historically OpenRISC GCC has reserved r10 which we now use to hold the thread pointer for thread-local storage (TLS). Signed-off-by: Christian Svensson <[email protected]> Signed-off-by: Stefan Kristiansson <[email protected]> Tested-by: Guenter Roeck <[email protected]> Signed-off-by: Stafford Horne <[email protected]>
2015-04-11whack-a-mole: no need to set_fs(USER_DS) in {start,flush}_thread()Al Viro1-1/+0
flush_old_exec() has already done that. Back on 2011 a bunch of instances like that had been kicked out, but that hadn't taken care of then-out-of-tree architectures, obviously, and they served as reinfection vector... Signed-off-by: Al Viro <[email protected]>
2013-04-30dump_stack: unify debug information printed by show_regs()Tejun Heo1-0/+1
show_regs() is inherently arch-dependent but it does make sense to print generic debug information and some archs already do albeit in slightly different forms. This patch introduces a generic function to print debug information from show_regs() so that different archs print out the same information and it's much easier to modify what's printed. show_regs_print_info() prints out the same debug info as dump_stack() does plus task and thread_info pointers. * Archs which didn't print debug info now do. alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r, metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc, um, xtensa * Already prints debug info. Replaced with show_regs_print_info(). The printed information is superset of what used to be there. arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86 * s390 is special in that it used to print arch-specific information along with generic debug info. Heiko and Martin think that the arch-specific extra isn't worth keeping s390 specfic implementation. Converted to use the generic version. Note that now all archs print the debug info before actual register dumps. An example BUG() dump follows. kernel BUG at /work/os/work/kernel/workqueue.c:4841! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7 Hardware name: empty empty/S3992, BIOS 080011 10/26/2007 task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000 RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6 RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246 RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001 RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650 0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760 Call Trace: [<ffffffff81000312>] do_one_initcall+0x122/0x170 [<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8 [<ffffffff81c47760>] ? rest_init+0x140/0x140 [<ffffffff81c4776e>] kernel_init+0xe/0xf0 [<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0 [<ffffffff81c47760>] ? rest_init+0x140/0x140 ... v2: Typo fix in x86-32. v3: CPU number dropped from show_regs_print_info() as dump_stack_print_info() has been updated to print it. s390 specific implementation dropped as requested by s390 maintainers. Signed-off-by: Tejun Heo <[email protected]> Acked-by: David S. Miller <[email protected]> Acked-by: Jesper Nilsson <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Fengguang Wu <[email protected]> Cc: Mike Frysinger <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Sam Ravnborg <[email protected]> Acked-by: Chris Metcalf <[email protected]> [tile bits] Acked-by: Richard Kuo <[email protected]> [hexagon bits] Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2012-11-28flagday: don't pass regs to copy_thread()Al Viro1-1/+1
Signed-off-by: Al Viro <[email protected]>
2012-11-28openrisc: switch to use of generic fork and cloneAl Viro1-2/+3
Signed-off-by: Al Viro <[email protected]>
2012-10-19openrisc: use generic sys_execveJonas Bonn1-24/+0
Signed-off-by: Jonas Bonn <[email protected]>
2012-10-19openrisc: use generic kernel_thread/kernel_execveJonas Bonn1-82/+56
Signed-off-by: Jonas Bonn <[email protected]>
2012-10-19openrisc: pass correct arg to schedule_tailJonas Bonn1-1/+0
schedule_tail() requires that the 'prev' task be passed as an argument to it. This arg is set in _switch, just before 'returning' to one of the ret_* functions where schedule_tail is invoked. Signed-off-by: Jonas Bonn <[email protected]>
2012-10-12vfs: define struct filename and have getname() return itJeff Layton1-2/+2
getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton <[email protected]> Signed-off-by: Al Viro <[email protected]>
2012-03-28Disintegrate asm/system.h for OpenRISCDavid Howells1-1/+0
Disintegrate asm/system.h for OpenRISC. Not compiled. Signed-off-by: David Howells <[email protected]> Acked-by: Arnd Bergmann <[email protected]> cc: [email protected]
2011-07-22OpenRISC: Scheduling/Process managementJonas Bonn1-0/+311
Signed-off-by: Jonas Bonn <[email protected]> Reviewed-by: Arnd Bergmann <[email protected]>