BMC/Intel-BMC/linux.git/arch/openrisc/kernel/traps.c, branch dev-4.17

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

2018-02-01T21:36:15+00:00

Pull printk updates from Petr Mladek: - Add a console_msg_format command line option: The value "default" keeps the old "[time stamp] text\n" format. The value "syslog" allows to see the syslog-like "[timestamp] text" format. This feature was requested by people doing regression tests, for example, 0day robot. They want to have both filtered and full logs at hands. - Reduce the risk of softlockup: Pass the console owner in a busy loop. This is a new approach to the old problem. It was first proposed by Steven Rostedt on Kernel Summit 2017. It marks a context in which the console_lock owner calls console drivers and could not sleep. On the other side, printk() callers could detect this state and use a busy wait instead of a simple console_trylock(). Finally, the console_lock owner checks if there is a busy waiter at the end of the special context and eventually passes the console_lock to the waiter. The hand-off works surprisingly well and helps in many situations. Well, there is still a possibility of the softlockup, for example, when the flood of messages stops and the last owner still has too much to flush. There is increasing number of people having problems with printk-related softlockups. We might eventually need to get better solution. Anyway, this looks like a good start and promising direction. - Do not allow to schedule in console_unlock() called from printk(): This reverts an older controversial commit. The reschedule helped to avoid softlockups. But it also slowed down the console output. This patch is obsoleted by the new console waiter logic described above. In fact, the reschedule made the hand-off less effective. - Deprecate "%pf" and "%pF" format specifier: It was needed on ia64, ppc64 and parisc64 to dereference function descriptors and show the real function address. It is done transparently by "%ps" and "pS" format specifier now. Sergey Senozhatsky found that all the function descriptors were in a special elf section and could be easily detected. - Remove printk_symbol() API: It has been obsoleted by "%pS" format specifier, and this change helped to remove few continuous lines and a less intuitive old API. - Remove redundant memsets: Sergey removed unnecessary memset when processing printk.devkmsg command line option. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk: (27 commits) printk: drop redundant devkmsg_log_str memsets printk: Never set console_may_schedule in console_trylock() printk: Hide console waiter logic into helpers printk: Add console owner and waiter logic to load balance console writes kallsyms: remove print_symbol() function checkpatch: add pF/pf deprecation warning symbol lookup: introduce dereference_symbol_descriptor() parisc64: Add .opd based function descriptor dereference powerpc64: Add .opd based function descriptor dereference ia64: Add .opd based function descriptor dereference sections: split dereference_function_descriptor() openrisc: Fix conflicting types for _exext and _stext lib: do not use print_symbol() irq debug: do not use print_symbol() sysfs: do not use print_symbol() drivers: do not use print_symbol() x86: do not use print_symbol() unicore32: do not use print_symbol() sh: do not use print_symbol() mn10300: do not use print_symbol() ...

signal/openrisc: Fix do_unaligned_access to send the proper signal

2018-01-12T20:20:02+00:00

While reviewing the signal sending on openrisc the do_unaligned_access function stood out because it is obviously wrong. A comment about an si_code set above when actually si_code is never set. Leading to a random si_code being sent to userspace in the event of an unaligned access. Looking further SIGBUS BUS_ADRALN is the proper pair of signal and si_code to send for an unaligned access. That is what other architectures do and what is required by posix. Given that do_unaligned_access is broken in a way that no one can be relying on it on openrisc fix the code to just do the right thing. Cc: stable@vger.kernel.org Fixes: 769a8a96229e ("OpenRISC: Traps") Cc: Jonas Bonn Cc: Stefan Kristiansson Cc: Stafford Horne Cc: Arnd Bergmann Cc: openrisc@lists.librecores.org Acked-by: Stafford Horne Signed-off-by: "Eric W. Biederman"

openrisc: Fix conflicting types for _exext and _stext

2018-01-09T09:40:02+00:00

The printk tree in linux-next has a patch "symbol lookup: introduce dereference_symbol_descriptor()" that includes sections.h in kallsyms.h, so arch/openrisc/kernel/traps.c gets a second extern definition for _etext and _stext. Remove the local definitions and include sections.h directly in preparation for the kallsyms.h change. This fixes the following (future) build error: CC arch/openrisc/kernel/traps.o arch/openrisc/kernel/traps.c:43:13: error: conflicting types for ‘_etext’ extern char _etext, _stext; ^ In file included from ./arch/openrisc/include/generated/asm/sections.h:1:0, from ./include/linux/kallsyms.h:15, from arch/openrisc/kernel/traps.c:35: ./include/asm-generic/sections.h:35:32: note: previous declaration of ‘_etext’ was here extern char _text[], _stext[], _etext[]; ^ Signed-off-by: Joel Stanley Reviewed-by: Sergey Senozhatsky Acked-by: Stafford Horne Signed-off-by: Petr Mladek

openrisc: support framepointers and STACKTRACE_SUPPORT

2017-11-03T05:01:15+00:00

For lockdep support a reliable stack trace mechanism is needed. This patch adds support in OpenRISC for the stacktrace framework, implemented by a simple unwinder api. The unwinder api supports both framepointer and basic stack tracing. The unwinder is now used to replace the stack_dump() implementation as well. The new traces are inline with other architectures trace format: Call trace: [] show_stack+0x3c/0x58 [] dump_stack+0xa8/0xe4 [] __cpu_up+0x64/0x130 [] bringup_cpu+0x3c/0x178 [] cpuhp_invoke_callback+0xa8/0x1fc [] cpuhp_up_callbacks+0x44/0x14c [] cpu_up+0x14c/0x1bc [] smp_init+0x104/0x15c [] ? kernel_init+0x0/0x140 [] kernel_init_freeable+0xbc/0x25c [] ? kernel_init+0x0/0x140 [] kernel_init+0x1c/0x140 [] ? schedule_tail+0x18/0xa0 [] ret_from_fork+0x1c/0x9c Signed-off-by: Stafford Horne

sched/headers: Prepare to move kstack_end() from to

2017-03-02T07:42:39+00:00

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.org Signed-off-by: Ingo Molnar

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

2017-03-02T07:42:34+00:00

We are going to split out of , which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder file that just maps to 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 Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

Merge tag 'openrisc-for-linus' of git://github.com/openrisc/linux

2017-02-25T02:37:03+00:00

Pull OpenRISC updates from Stafford Horne: "Highlights include: - optimized memset and memcpy routines, ~20% boot time saving - support for cpu idling - adding support for l.swa and l.lwa atomic operations (in spec from 2014) - use atomics to implement: bitops, cmpxchg, futex - the atomics are in preparation for SMP support" * tag 'openrisc-for-linus' of git://github.com/openrisc/linux: (25 commits) openrisc: head: Init r0 to 0 on start openrisc: Export ioremap symbols used by modules arch/openrisc/lib/memcpy.c: use correct OR1200 option openrisc: head: Remove unused strings openrisc: head: Move init strings to rodata section openrisc: entry: Fix delay slot detection openrisc: entry: Whitespace and comment cleanups scripts/checkstack.pl: Add openrisc support MAINTAINERS: Add the openrisc official repository openrisc: Add .gitignore openrisc: Add optimized memcpy routine openrisc: Add optimized memset openrisc: Initial support for the idle state openrisc: Fix the bitmask for the unit present register openrisc: remove unnecessary stddef.h include openrisc: add futex_atomic_* implementations openrisc: add optimized atomic operations openrisc: add cmpxchg and xchg implementations openrisc: add atomic bitops openrisc: add l.lwa/l.swa emulation ...

openrisc: add l.lwa/l.swa emulation

2017-02-06T12:50:43+00:00

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 [shorne@gmail.com: Added delay slot pc adjust logic] Signed-off-by: Stafford Horne

openrisc: migrate exception table users off module.h and onto extable.h

2017-01-26T15:58:04+00:00

These files were only including module.h for exception table related functions. We've now separated that content out into its own file "extable.h" so now move over to that and avoid all the extra header content in module.h that we don't really need to compile these files. Reported-by: kbuild test robot Cc: Jonas Bonn Cc: Stefan Kristiansson Cc: Stafford Horne Cc: openrisc@lists.librecores.org Signed-off-by: Paul Gortmaker

Replace with globally

2016-12-24T19:46:01+00:00

This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*' sed -i -e "s!$PATT!#include !" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro Signed-off-by: Linus Torvalds