https://github.com/torvalds/linux
Revision d6097c9e4454adf1f8f2c9547c2fa6060d55d952 authored by Peter Zijlstra on 23 April 2019, 20:03:18 UTC, committed by Steven Rostedt (VMware) on 26 April 2019, 15:45:03 UTC
Unless the very next line is schedule(), or implies it, one must not use
preempt_enable_no_resched(). It can cause a preemption to go missing and
thereby cause arbitrary delays, breaking the PREEMPT=y invariant.
Link: http://lkml.kernel.org/r/20190423200318.GY14281@hirez.programming.kicks-ass.net
Cc: Waiman Long <longman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: the arch/x86 maintainers <x86@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: huang ying <huang.ying.caritas@gmail.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: stable@vger.kernel.org
Fixes: 2c2d7329d8af ("tracing/ftrace: use preempt_enable_no_resched_notrace in ring_buffer_time_stamp()")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 parent 91862cc
Tip revision: d6097c9e4454adf1f8f2c9547c2fa6060d55d952 authored by Peter Zijlstra on 23 April 2019, 20:03:18 UTC
trace: Fix preempt_enable_no_resched() abuse
trace: Fix preempt_enable_no_resched() abuse
Tip revision: d6097c9
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| .clang-format | -rw-r--r-- | 13.9 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
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| COPYING | -rw-r--r-- | 423 bytes |
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| Kconfig | -rw-r--r-- | 563 bytes |
| MAINTAINERS | -rw-r--r-- | 491.0 KB |
| Makefile | -rw-r--r-- | 58.3 KB |
| README | -rw-r--r-- | 727 bytes |
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