kernel/linux.git/arch/parisc/include/asm/processor.h, branch v6.1.168

kernel: exit: cleanup release_thread()

2022-09-12T04:55:07+00:00

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/20220819014406.32266-1-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Acked-by: Guo Ren [csky] Acked-by: Russell King (Oracle) Acked-by: Geert Uytterhoeven Acked-by: Brian Cain Acked-by: Michael Ellerman [powerpc] Acked-by: Stafford Horne [openrisc] Acked-by: Catalin Marinas [arm64] Acked-by: Huacai Chen [LoongArch] Cc: Alexander Gordeev Cc: Anton Ivanov Cc: Borislav Petkov Cc: Christian Borntraeger Cc: Christophe Leroy Cc: Chris Zankel Cc: Dave Hansen Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Guo Ren [csky] Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ivan Kokshaysky Cc: James Bottomley Cc: Johannes Berg Cc: Jonas Bonn Cc: Matt Turner Cc: Max Filippov Cc: Michal Simek Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Richard Henderson Cc: Richard Weinberger Cc: Rich Felker Cc: Stefan Kristiansson Cc: Sven Schnelle Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Cc: Xuerui Wang Cc: Yoshinori Sato Signed-off-by: Andrew Morton

parisc: Find a new timesync master if current CPU is removed

2022-03-29T19:37:13+00:00

When CPU hotplugging is enabled, the user may want to remove the current CPU which is providing the timer ticks. If this happens we need to find a new timesync master. Signed-off-by: Helge Deller

parisc: Add vDSO support

2022-03-11T18:49:30+00:00

Add minimal vDSO support, which provides the signal trampoline helpers, but none of the userspace syscall helpers like time wrappers. The big benefit of this vDSO implementation is, that we now don't need an executeable stack any longer. PA-RISC is one of the last architectures where an executeable stack was needed in oder to implement the signal trampolines by putting assembly instructions on the stack which then gets executed. Instead the kernel will provide the relevant code in the vDSO page and only put the pointers to the signal information on the stack. By dropping the need for executable stacks we avoid running into issues with applications which want non executable stacks for security reasons. Additionally, alternative stacks on memory areas without exec permissions are supported too. This code is based on an initial implementation by Randolph Chung from 2006: https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ I did the porting and lifted the code to current code base. Dave fixed the unwind code so that gdb and glibc are able to backtrace through the code. An additional patch to gdb will be pushed upstream by Dave. Signed-off-by: Helge Deller Signed-off-by: Dave Anglin Cc: Randolph Chung Signed-off-by: Helge Deller

parisc: Fix missing prototype for 'toc_intr' warning in toc.c

2022-01-20T19:39:19+00:00

Fix a missing prototype warning noticed by the kernel test robot. Reported-by: kernel test robot Signed-off-by: Helge Deller

Merge tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2021-11-01T23:51:13+00:00

Pull parisc updates from Helge Deller: "Lots of new features and fixes: - Added TOC (table of content) support, which is a debugging feature which is either initiated by pressing the TOC button or via command in the BMC. If pressed the Linux built-in KDB/KGDB will be called (Sven Schnelle) - Fix CONFIG_PREEMPT (Sven) - Fix unwinder on 64-bit kernels (Sven) - Various kgdb fixes (Sven) - Added KFENCE support (me) - Switch to ARCH_STACKWALK implementation (me) - Fix ptrace check on syscall return (me) - Fix kernel crash with fixmaps on PA1.x machines (me) - Move thread_info into task struct, aka CONFIG_THREAD_INFO_IN_TASK (me) - Updated defconfigs - Smaller cleanups, including Makefile cleanups (Masahiro Yamada), use kthread_run() macro (Cai Huoqing), use swap() macro (Yihao Han)" * tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (36 commits) parisc: Fix set_fixmap() on PA1.x CPUs parisc: Use swap() to swap values in setup_bootmem() parisc: Update defconfigs parisc: decompressor: clean up Makefile parisc: decompressor: remove repeated depenency of misc.o parisc: Remove unused constants from asm-offsets.c parisc/ftrace: use static key to enable/disable function graph tracer parisc/ftrace: set function trace function parisc: Make use of the helper macro kthread_run() parisc: mark xchg functions notrace parisc: enhance warning regarding usage of O_NONBLOCK parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.h parisc: Use PRIV_USER in syscall.S parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling parisc: Move thread_info into task struct parisc: add support for TOC (transfer of control) parisc/firmware: add functions to retrieve TOC data parisc: add PIM TOC data structures parisc: move virt_map macro to assembly.h ...

parisc: Drop ifdef KERNEL from non-uapi kernel headers

2021-11-01T06:36:00+00:00

Signed-off-by: Helge Deller

parisc: Move thread_info into task struct

2021-11-01T06:35:59+00:00

This implements the CONFIG_THREAD_INFO_IN_TASK option. With this change: - before thread_info was part of the stack and located at the beginning of the stack - now the thread_info struct is moved and located inside the task_struct structure - the stack is allocated and handled like the major other platforms - drop the cpu field of thread_info and use instead the one in task_struct Signed-off-by: Helge Deller Signed-off-by: Sven Schnelle

parisc: add support for TOC (transfer of control)

2021-11-01T06:35:59+00:00

Almost all PA-RISC machines have either a button that is labeled with 'TOC' or a BMC function to trigger a TOC. TOC is a non-maskable interrupt that is sent to the processor. This can be used for diagnostic purposes like obtaining a stack trace/register dump or to enter KDB/KGDB. As an example, on my c8000, TOC can be used with: CONFIG_KGDB=y CONFIG_KGDB_KDB=y and the 'kgdboc=ttyS0,115200' appended to the command line. Press ^[( on serial console, which will enter the BMC command line, and enter 'TOC s': root@(none):/# ( cli>TOC s Sending TOC/INIT. 2800035d03e00000 0000000040c21ac8 CC_ERR_CHECK_TOC 2800035d00e00000 0000000040c21ad0 CC_ERR_CHECK_TOC 2800035d02e00000 0000000040c21ac8 CC_ERR_CHECK_TOC 2800035d01e00000 0000000040c21ad0 CC_ERR_CHECK_TOC 37000f7303e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY 37000f7300e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY 37000f7302e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY 37000f7301e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY 4300100803e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC 4300100800e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC 4300100802e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC 4300100801e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC Entering kdb (current=0x00000000411cef80, pid 0) on processor 0 due to NonMaskable Interrupt @ 0x40c21ad0 [0]kdb> Signed-off-by: Sven Schnelle Signed-off-by: Helge Deller

parisc: Allocate task struct with stack frame alignment

2021-10-30T21:11:01+00:00

We will put the stack directly behind the task struct, so make sure that we allocate it with an alignment of 64 bytes. Signed-off-by: Helge Deller

sched: Add wrapper for get_wchan() to keep task blocked

2021-10-15T09:25:14+00:00

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 Signed-off-by: Kees Cook Signed-off-by: Peter Zijlstra (Intel) Acked-by: Geert Uytterhoeven Acked-by: Russell King (Oracle) [arm] Tested-by: Mark Rutland [arm64] Link: https://lkml.kernel.org/r/20211008111626.332092234@infradead.org